package dap

import (
	"bufio"
	"bytes"
	"flag"
	"fmt"
	"io"
	"math"
	"math/rand"
	"net"
	"os"
	"os/exec"
	"path/filepath"
	"reflect"
	"regexp"
	"runtime"
	"strconv"
	"strings"
	"testing"
	"time"

	"github.com/go-delve/delve/pkg/goversion"
	"github.com/go-delve/delve/pkg/logflags"
	"github.com/go-delve/delve/pkg/proc"
	protest "github.com/go-delve/delve/pkg/proc/test"
	"github.com/go-delve/delve/service"
	"github.com/go-delve/delve/service/api"
	"github.com/go-delve/delve/service/dap/daptest"
	"github.com/go-delve/delve/service/debugger"
	"github.com/google/go-dap"
)

const (
	stopOnEntry bool = true
	hasChildren bool = true
	noChildren  bool = false
)

const (
	localsScope  = 1000
	globalsScope = 1001
)

var testBackend string

func TestMain(m *testing.M) {
	logOutputVal := ""
	if _, isTeamCityTest := os.LookupEnv("TEAMCITY_VERSION"); isTeamCityTest {
		logOutputVal = "debugger,dap"
	}
	var logOutput string
	flag.StringVar(&logOutput, "log-output", logOutputVal, "configures log output")
	flag.Parse()
	logflags.Setup(logOutput != "", logOutput, "")
	protest.DefaultTestBackend(&testBackend)
	protest.RunTestsWithFixtures(m)
}

// name is for _fixtures/<name>.go
func runTest(t *testing.T, name string, test func(c *daptest.Client, f protest.Fixture)) {
	runTestBuildFlags(t, name, test, protest.AllNonOptimized, false)
}

// name is for _fixtures/<name>.go
func runTestBuildFlags(t *testing.T, name string, test func(c *daptest.Client, f protest.Fixture), buildFlags protest.BuildFlags, defaultDebugInfoDirs bool) {
	fixture := protest.BuildFixture(name, buildFlags)

	// Start the DAP server.
	serverStopped := make(chan struct{})
	client := startDAPServerWithClient(t, defaultDebugInfoDirs, serverStopped)
	defer client.Close()

	test(client, fixture)
	<-serverStopped
}

func startDAPServerWithClient(t *testing.T, defaultDebugInfoDirs bool, serverStopped chan struct{}) *daptest.Client {
	server, _ := startDAPServer(t, defaultDebugInfoDirs, serverStopped)
	client := daptest.NewClient(server.config.Listener.Addr().String())
	return client
}

// Starts an empty server and a stripped down config just to establish a client connection.
// To mock a server created by dap.NewServer(config) or serving dap.NewSession(conn, config, debugger)
// set those arg fields manually after the server creation.
func startDAPServer(t *testing.T, defaultDebugInfoDirs bool, serverStopped chan struct{}) (server *Server, forceStop chan struct{}) {
	// Start the DAP server.
	listener, err := net.Listen("tcp", ":0")
	if err != nil {
		t.Fatal(err)
	}
	debugInfoDirs := []string{}
	if defaultDebugInfoDirs {
		debugInfoDirs = []string{"/usr/lib/debug/.build-id"}
	}
	disconnectChan := make(chan struct{})
	server = NewServer(&service.Config{
		Listener:       listener,
		DisconnectChan: disconnectChan,
		Debugger:       debugger.Config{DebugInfoDirectories: debugInfoDirs},
	})
	server.Run()
	// Give server time to start listening for clients
	time.Sleep(100 * time.Millisecond)

	// Run a goroutine that stops the server when disconnectChan is signaled.
	// This helps us test that certain events cause the server to stop as
	// expected.
	forceStop = make(chan struct{})
	go func() {
		defer func() {
			if serverStopped != nil {
				close(serverStopped)
			}
		}()
		select {
		case <-disconnectChan:
			t.Log("server stop triggered internally")
		case <-forceStop:
			t.Log("server stop triggered externally")
		}
		server.Stop()
	}()

	return server, forceStop
}

func verifyServerStopped(t *testing.T, server *Server) {
	t.Helper()
	if server.listener != nil {
		if server.listener.Close() == nil {
			t.Error("server should have closed listener after shutdown")
		}
	}
	verifySessionStopped(t, server.session)
}

func verifySessionStopped(t *testing.T, session *Session) {
	t.Helper()
	if session == nil {
		return
	}
	if session.conn == nil {
		t.Error("session must always have a set connection")
	}
	verifyConnStopped(t, session.conn)
	if session.debugger != nil {
		t.Error("session should have no pointer to debugger after shutdown")
	}
	if session.binaryToRemove != "" {
		t.Error("session should have no binary to remove after shutdown")
	}
}

func verifyConnStopped(t *testing.T, conn io.ReadWriteCloser) {
	t.Helper()
	if conn.Close() == nil {
		t.Error("client connection should be closed after shutdown")
	}
}

func TestStopNoClient(t *testing.T) {
	for name, triggerStop := range map[string]func(s *Server, forceStop chan struct{}){
		"force":        func(s *Server, forceStop chan struct{}) { close(forceStop) },
		"accept error": func(s *Server, forceStop chan struct{}) { s.config.Listener.Close() },
	} {
		t.Run(name, func(t *testing.T) {
			serverStopped := make(chan struct{})
			server, forceStop := startDAPServer(t, false, serverStopped)
			triggerStop(server, forceStop)
			<-serverStopped
			verifyServerStopped(t, server)
		})
	}
}

func TestStopNoTarget(t *testing.T) {
	for name, triggerStop := range map[string]func(c *daptest.Client, forceStop chan struct{}){
		"force":      func(c *daptest.Client, forceStop chan struct{}) { close(forceStop) },
		"read error": func(c *daptest.Client, forceStop chan struct{}) { c.Close() },
		"disconnect": func(c *daptest.Client, forceStop chan struct{}) { c.DisconnectRequest() },
	} {
		t.Run(name, func(t *testing.T) {
			serverStopped := make(chan struct{})
			server, forceStop := startDAPServer(t, false, serverStopped)
			client := daptest.NewClient(server.config.Listener.Addr().String())
			defer client.Close()

			client.InitializeRequest()
			client.ExpectInitializeResponseAndCapabilities(t)
			triggerStop(client, forceStop)
			<-serverStopped
			verifyServerStopped(t, server)
		})
	}
}

func TestStopWithTarget(t *testing.T) {
	for name, triggerStop := range map[string]func(c *daptest.Client, forceStop chan struct{}){
		"force":                  func(c *daptest.Client, forceStop chan struct{}) { close(forceStop) },
		"read error":             func(c *daptest.Client, forceStop chan struct{}) { c.Close() },
		"disconnect before exit": func(c *daptest.Client, forceStop chan struct{}) { c.DisconnectRequest() },
		"disconnect after  exit": func(c *daptest.Client, forceStop chan struct{}) {
			c.ContinueRequest(1)
			c.ExpectContinueResponse(t)
			c.ExpectTerminatedEvent(t)
			c.DisconnectRequest()
		},
	} {
		t.Run(name, func(t *testing.T) {
			serverStopped := make(chan struct{})
			server, forceStop := startDAPServer(t, false, serverStopped)
			client := daptest.NewClient(server.config.Listener.Addr().String())
			defer client.Close()

			client.InitializeRequest()
			client.ExpectInitializeResponseAndCapabilities(t)
			fixture := protest.BuildFixture("increment", protest.AllNonOptimized)
			client.LaunchRequest("debug", fixture.Source, stopOnEntry)
			client.ExpectProcessEvent(t)
			client.ExpectInitializedEvent(t)
			client.ExpectLaunchResponse(t)
			triggerStop(client, forceStop)
			<-serverStopped
			verifyServerStopped(t, server)
		})
	}
}

func TestSessionStop(t *testing.T) {
	verifySessionState := func(t *testing.T, s *Session, binaryToRemoveSet bool, debuggerSet bool, disconnectChanSet bool) {
		t.Helper()
		if binaryToRemoveSet && s.binaryToRemove == "" || !binaryToRemoveSet && s.binaryToRemove != "" {
			t.Errorf("binaryToRemove: got %s, want set=%v", s.binaryToRemove, binaryToRemoveSet)
		}
		if debuggerSet && s.debugger == nil || !debuggerSet && s.debugger != nil {
			t.Errorf("debugger: got %v, want set=%v", s.debugger, debuggerSet)
		}
		if disconnectChanSet && s.config.DisconnectChan == nil || !disconnectChanSet && s.config.DisconnectChan != nil {
			t.Errorf("disconnectChan: got %v, want set=%v", s.config.DisconnectChan, disconnectChanSet)
		}
	}
	for name, stopSession := range map[string]func(s *Session, c *daptest.Client, serveDone chan struct{}){
		"force": func(s *Session, c *daptest.Client, serveDone chan struct{}) {
			s.Close()
			<-serveDone
			verifySessionState(t, s, false /*binaryToRemoveSet*/, false /*debuggerSet*/, false /*disconnectChanSet*/)
		},
		"read error": func(s *Session, c *daptest.Client, serveDone chan struct{}) {
			c.Close()
			<-serveDone
			verifyConnStopped(t, s.conn)
			verifySessionState(t, s, true /*binaryToRemoveSet*/, true /*debuggerSet*/, false /*disconnectChanSet*/)
			s.Close()
		},
		"disconnect before exit": func(s *Session, c *daptest.Client, serveDone chan struct{}) {
			c.DisconnectRequest()
			<-serveDone
			verifyConnStopped(t, s.conn)
			verifySessionState(t, s, true /*binaryToRemoveSet*/, false /*debuggerSet*/, false /*disconnectChanSet*/)
			s.Close()
		},
		"disconnect after exit": func(s *Session, c *daptest.Client, serveDone chan struct{}) {
			c.ContinueRequest(1)
			c.ExpectContinueResponse(t)
			c.ExpectTerminatedEvent(t)
			c.DisconnectRequest()
			<-serveDone
			verifyConnStopped(t, s.conn)
			verifySessionState(t, s, true /*binaryToRemoveSet*/, false /*debuggerSet*/, false /*disconnectChanSet*/)
			s.Close()
		},
	} {
		t.Run(name, func(t *testing.T) {
			listener, err := net.Listen("tcp", ":0")
			if err != nil {
				t.Fatalf("cannot setup listener required for testing: %v", err)
			}
			defer listener.Close()
			acceptDone := make(chan struct{})
			var conn net.Conn
			go func() {
				conn, err = listener.Accept()
				close(acceptDone)
			}()
			time.Sleep(10 * time.Millisecond) // give time to start listening
			client := daptest.NewClient(listener.Addr().String())
			defer client.Close()
			<-acceptDone
			if err != nil {
				t.Fatalf("cannot accept client required for testing: %v", err)
			}
			session := NewSession(conn, &Config{
				Config:        &service.Config{DisconnectChan: make(chan struct{})},
				StopTriggered: make(chan struct{}),
			}, nil)
			serveDAPCodecDone := make(chan struct{})
			go func() {
				session.ServeDAPCodec()
				close(serveDAPCodecDone)
			}()
			time.Sleep(10 * time.Millisecond) // give time to start reading
			client.InitializeRequest()
			client.ExpectInitializeResponseAndCapabilities(t)
			fixture := protest.BuildFixture("increment", protest.AllNonOptimized)
			client.LaunchRequest("debug", fixture.Source, stopOnEntry)
			client.ExpectProcessEvent(t)
			client.ExpectInitializedEvent(t)
			client.ExpectLaunchResponse(t)
			stopSession(session, client, serveDAPCodecDone)
			verifySessionStopped(t, session)
		})
	}
}

func TestForceStopWhileStopping(t *testing.T) {
	serverStopped := make(chan struct{})
	server, forceStop := startDAPServer(t, false, serverStopped)
	client := daptest.NewClient(server.config.Listener.Addr().String())

	client.InitializeRequest()
	client.ExpectInitializeResponseAndCapabilities(t)
	fixture := protest.BuildFixture("increment", protest.AllNonOptimized)
	client.LaunchRequest("exec", fixture.Path, stopOnEntry)
	client.ExpectProcessEvent(t)
	client.ExpectInitializedEvent(t)
	client.Close() // depending on timing may trigger Stop()
	time.Sleep(time.Microsecond)
	close(forceStop) // depending on timing may trigger Stop()
	<-serverStopped
	verifyServerStopped(t, server)
}

// TestLaunchStopOnEntry emulates the message exchange that can be observed with
// VS Code for the most basic launch debug session with "stopOnEntry" enabled:
//
//	User selects "Start Debugging":  1 >> initialize
//	                              :  1 << initialize
//	                              :  2 >> launch
//	                              :    << process event
//	                              :    << initialized event
//	                              :  2 << launch
//	                              :  3 >> setBreakpoints (empty)
//	                              :  3 << setBreakpoints
//	                              :  4 >> setExceptionBreakpoints (empty)
//	                              :  4 << setExceptionBreakpoints
//	                              :  5 >> configurationDone
//	Program stops upon launching  :    << stopped event
//	                              :  5 << configurationDone
//	                              :  6 >> threads
//	                              :  6 << threads (Dummy)
//	                              :  7 >> threads
//	                              :  7 << threads (Dummy)
//	                              :  8 >> stackTrace
//	                              :  8 << error (Unable to produce stack trace)
//	                              :  9 >> stackTrace
//	                              :  9 << error (Unable to produce stack trace)
//	User evaluates bad expression : 10 >> evaluate
//	                              : 10 << error (unable to find function context)
//	User evaluates good expression: 11 >> evaluate
//	                              : 11 << evaluate
//	User selects "Continue"       : 12 >> continue
//	                              : 12 << continue
//	Program runs to completion    :    << terminated event
//	                              : 13 >> disconnect
//	                              :    << output event (Process exited)
//	                              :    << output event (Detaching)
//	                              : 13 << disconnect
//
// This test exhaustively tests Seq and RequestSeq on all messages from the
// server. Other tests do not necessarily need to repeat all these checks.
func TestLaunchStopOnEntry(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// 1 >> initialize, << initialize
		client.InitializeRequest()
		initResp := client.ExpectInitializeResponseAndCapabilities(t)
		if initResp.Seq != 0 || initResp.RequestSeq != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=1", initResp)
		}

		// 2 >> launch, << process, << initialized, << launch
		client.LaunchRequest("exec", fixture.Path, stopOnEntry)

		processEvent := client.ExpectProcessEvent(t)
		if processEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", processEvent)
		}

		initEvent := client.ExpectInitializedEvent(t)
		if initEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", initEvent)
		}
		launchResp := client.ExpectLaunchResponse(t)
		if launchResp.Seq != 0 || launchResp.RequestSeq != 2 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=2", launchResp)
		}

		// 3 >> setBreakpoints, << setBreakpoints
		client.SetBreakpointsRequest(fixture.Source, nil)
		sbpResp := client.ExpectSetBreakpointsResponse(t)
		if sbpResp.Seq != 0 || sbpResp.RequestSeq != 3 || len(sbpResp.Body.Breakpoints) != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=3, len(Breakpoints)=0", sbpResp)
		}

		// 4 >> setExceptionBreakpoints, << setExceptionBreakpoints
		client.SetExceptionBreakpointsRequest()
		sebpResp := client.ExpectSetExceptionBreakpointsResponse(t)
		if sebpResp.Seq != 0 || sebpResp.RequestSeq != 4 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=4", sebpResp)
		}

		// 5 >> configurationDone, << stopped, << configurationDone
		client.ConfigurationDoneRequest()
		stopEvent := client.ExpectStoppedEvent(t)
		if stopEvent.Seq != 0 ||
			stopEvent.Body.Reason != "entry" ||
			stopEvent.Body.ThreadId != 1 ||
			!stopEvent.Body.AllThreadsStopped {
			t.Errorf("\ngot %#v\nwant Seq=0, Body={Reason=\"entry\", ThreadId=1, AllThreadsStopped=true}", stopEvent)
		}
		cdResp := client.ExpectConfigurationDoneResponse(t)
		if cdResp.Seq != 0 || cdResp.RequestSeq != 5 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=5", cdResp)
		}

		// 6 >> threads, << threads
		client.ThreadsRequest()
		tResp := client.ExpectThreadsResponse(t)
		if tResp.Seq != 0 || tResp.RequestSeq != 6 || len(tResp.Body.Threads) != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=6 len(Threads)=1", tResp)
		}
		if tResp.Body.Threads[0].Id != 1 || tResp.Body.Threads[0].Name != "Dummy" {
			t.Errorf("\ngot %#v\nwant Id=1, Name=\"Dummy\"", tResp)
		}

		// 7 >> threads, << threads
		client.ThreadsRequest()
		tResp = client.ExpectThreadsResponse(t)
		if tResp.Seq != 0 || tResp.RequestSeq != 7 || len(tResp.Body.Threads) != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=7 len(Threads)=1", tResp)
		}

		// 8 >> stackTrace, << error
		client.StackTraceRequest(1, 0, 20)
		stResp := client.ExpectInvisibleErrorResponse(t)
		if stResp.Seq != 0 || stResp.RequestSeq != 8 || !checkErrorMessageFormat(stResp.Body.Error, "Unable to produce stack trace: unknown goroutine 1") {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=8 Format=\"Unable to produce stack trace: unknown goroutine 1\"", stResp)
		}

		// 9 >> stackTrace, << error
		client.StackTraceRequest(1, 0, 20)
		stResp = client.ExpectInvisibleErrorResponse(t)
		if stResp.Seq != 0 || stResp.RequestSeq != 9 || !checkErrorMessageId(stResp.Body.Error, UnableToProduceStackTrace) {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=9 Id=%d", stResp, UnableToProduceStackTrace)
		}

		// 10 >> evaluate, << error
		client.EvaluateRequest("foo", 0 /*no frame specified*/, "repl")
		erResp := client.ExpectInvisibleErrorResponse(t)
		if erResp.Seq != 0 || erResp.RequestSeq != 10 || !checkErrorMessageId(erResp.Body.Error, UnableToEvaluateExpression) {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10 Id=%d", erResp, UnableToEvaluateExpression)
		}

		// 11 >> evaluate, << evaluate
		client.EvaluateRequest("1+1", 0 /*no frame specified*/, "repl")
		evResp := client.ExpectEvaluateResponse(t)
		if evResp.Seq != 0 || evResp.RequestSeq != 11 || evResp.Body.Result != "2" {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10 Result=2", evResp)
		}

		// 12 >> continue, << continue, << terminated
		client.ContinueRequest(1)
		contResp := client.ExpectContinueResponse(t)
		if contResp.Seq != 0 || contResp.RequestSeq != 12 || !contResp.Body.AllThreadsContinued {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=12 Body.AllThreadsContinued=true", contResp)
		}
		termEvent := client.ExpectTerminatedEvent(t)
		if termEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", termEvent)
		}

		// 13 >> disconnect, << disconnect
		client.DisconnectRequest()
		oep := client.ExpectOutputEventProcessExited(t, 0)
		if oep.Seq != 0 || oep.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Seq=0 Category='console'", oep)
		}
		oed := client.ExpectOutputEventDetaching(t)
		if oed.Seq != 0 || oed.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Seq=0 Category='console'", oed)
		}
		dResp := client.ExpectDisconnectResponse(t)
		if dResp.Seq != 0 || dResp.RequestSeq != 13 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=13", dResp)
		}
		client.ExpectTerminatedEvent(t)
	})
}

// TestAttachStopOnEntry is like TestLaunchStopOnEntry, but with attach request.
func TestAttachStopOnEntry(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		// Start the program to attach to
		cmd := exec.Command(fixture.Path)
		stdout, err := cmd.StdoutPipe()
		if err != nil {
			t.Fatal(err)
		}
		cmd.Stderr = os.Stderr
		if err := cmd.Start(); err != nil {
			t.Fatal(err)
		}
		// Wait for output.
		// This will give the target process time to initialize the runtime before we attach,
		// so we can rely on having goroutines when they are requested on attach.
		scanOut := bufio.NewScanner(stdout)
		scanOut.Scan()
		if scanOut.Text() != "past main" {
			t.Errorf("expected loopprog.go to output \"past main\"")
		}

		// 1 >> initialize, << initialize
		client.InitializeRequest()
		initResp := client.ExpectInitializeResponseAndCapabilities(t)
		if initResp.Seq != 0 || initResp.RequestSeq != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=1", initResp)
		}

		// 2 >> attach, << initialized, << attach
		client.AttachRequest(
			map[string]interface{}{"mode": "local", "processId": cmd.Process.Pid, "stopOnEntry": true, "backend": "default"})
		client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
		initEvent := client.ExpectInitializedEvent(t)
		if initEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", initEvent)
		}
		attachResp := client.ExpectAttachResponse(t)
		if attachResp.Seq != 0 || attachResp.RequestSeq != 2 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=2", attachResp)
		}

		// 3 >> setBreakpoints, << setBreakpoints
		client.SetBreakpointsRequest(fixture.Source, nil)
		sbpResp := client.ExpectSetBreakpointsResponse(t)
		if sbpResp.Seq != 0 || sbpResp.RequestSeq != 3 || len(sbpResp.Body.Breakpoints) != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=3, len(Breakpoints)=0", sbpResp)
		}

		// 4 >> setExceptionBreakpoints, << setExceptionBreakpoints
		client.SetExceptionBreakpointsRequest()
		sebpResp := client.ExpectSetExceptionBreakpointsResponse(t)
		if sebpResp.Seq != 0 || sebpResp.RequestSeq != 4 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=4", sebpResp)
		}

		// 5 >> configurationDone, << stopped, << configurationDone
		client.ConfigurationDoneRequest()
		stopEvent := client.ExpectStoppedEvent(t)
		if stopEvent.Seq != 0 ||
			stopEvent.Body.Reason != "entry" ||
			stopEvent.Body.ThreadId != 1 ||
			!stopEvent.Body.AllThreadsStopped {
			t.Errorf("\ngot %#v\nwant Seq=0, Body={Reason=\"entry\", ThreadId=1, AllThreadsStopped=true}", stopEvent)
		}
		cdResp := client.ExpectConfigurationDoneResponse(t)
		if cdResp.Seq != 0 || cdResp.RequestSeq != 5 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=5", cdResp)
		}

		// 6 >> threads, << threads
		client.ThreadsRequest()
		tResp := client.ExpectThreadsResponse(t)
		// Expect main goroutine plus runtime at this point.
		if tResp.Seq != 0 || tResp.RequestSeq != 6 || len(tResp.Body.Threads) < 2 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=6 len(Threads)>1", tResp)
		}

		// 7 >> threads, << threads
		client.ThreadsRequest()
		client.ExpectThreadsResponse(t)

		// 8 >> stackTrace, << response
		client.StackTraceRequest(1, 0, 20)
		client.ExpectStackTraceResponse(t)

		// 9 >> stackTrace, << response
		client.StackTraceRequest(1, 0, 20)
		client.ExpectStackTraceResponse(t)

		// 10 >> evaluate, << error
		client.EvaluateRequest("foo", 0 /*no frame specified*/, "repl")
		erResp := client.ExpectInvisibleErrorResponse(t)
		if erResp.Seq != 0 || erResp.RequestSeq != 10 || !checkErrorMessageId(erResp.Body.Error, UnableToEvaluateExpression) {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10 Id=%d", erResp, UnableToEvaluateExpression)
		}

		// 11 >> evaluate, << evaluate
		client.EvaluateRequest("1+1", 0 /*no frame specified*/, "repl")
		evResp := client.ExpectEvaluateResponse(t)
		if evResp.Seq != 0 || evResp.RequestSeq != 11 || evResp.Body.Result != "2" {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10 Result=2", evResp)
		}

		// 12 >> continue, << continue
		client.ContinueRequest(1)
		cResp := client.ExpectContinueResponse(t)
		if cResp.Seq != 0 || cResp.RequestSeq != 12 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=12", cResp)
		}

		// TODO(polina): once https://github.com/go-delve/delve/issues/2259 is
		// fixed, test with kill=false.

		// 13 >> disconnect, << disconnect
		client.DisconnectRequestWithKillOption(true)

		// Disconnect consists of Halt + Detach.
		// Halt interrupts command in progress, which triggers
		// a stopped event in parallel with the disconnect
		// sequence. It might arrive before or during the sequence
		// or never if the server exits before it is sent.
		msg := expectMessageFilterStopped(t, client)
		client.CheckOutputEvent(t, msg)
		msg = expectMessageFilterStopped(t, client)
		client.CheckDisconnectResponse(t, msg)
		client.ExpectTerminatedEvent(t)

		// If this call to KeepAlive isn't here there's a chance that stdout will
		// be garbage collected (since it is no longer alive long before this
		// point), when that happens, on unix-like OSes, the read end of the pipe
		// will be closed by the finalizer and the target process will die by
		// SIGPIPE, which the rest of this test does not expect.
		runtime.KeepAlive(stdout)
	})
}

// Like the test above, except the program is configured to continue on entry.
func TestContinueOnEntry(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// 1 >> initialize, << initialize
		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)

		// 2 >> launch, << initialized, << launch
		client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
		client.ExpectProcessEvent(t)
		client.ExpectInitializedEvent(t)
		client.ExpectLaunchResponse(t)

		// 3 >> setBreakpoints, << setBreakpoints
		client.SetBreakpointsRequest(fixture.Source, nil)
		client.ExpectSetBreakpointsResponse(t)

		// 4 >> setExceptionBreakpoints, << setExceptionBreakpoints
		client.SetExceptionBreakpointsRequest()
		client.ExpectSetExceptionBreakpointsResponse(t)

		// 5 >> configurationDone, << configurationDone
		client.ConfigurationDoneRequest()
		client.ExpectConfigurationDoneResponse(t)
		// "Continue" happens behind the scenes on another goroutine

		client.ExpectTerminatedEvent(t)

		// 6 >> threads, << threads
		client.ThreadsRequest()
		tResp := client.ExpectThreadsResponse(t)
		if tResp.Seq != 0 || tResp.RequestSeq != 6 || len(tResp.Body.Threads) != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=6 len(Threads)=1", tResp)
		}
		if tResp.Body.Threads[0].Id != 1 || tResp.Body.Threads[0].Name != "Dummy" {
			t.Errorf("\ngot %#v\nwant Id=1, Name=\"Dummy\"", tResp)
		}

		// 7 >> disconnect, << disconnect
		client.DisconnectRequest()
		client.ExpectOutputEventProcessExited(t, 0)
		client.ExpectOutputEventDetaching(t)
		dResp := client.ExpectDisconnectResponse(t)
		if dResp.Seq != 0 || dResp.RequestSeq != 7 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=7", dResp)
		}
		client.ExpectTerminatedEvent(t)
	})
}

// TestPreSetBreakpoint corresponds to a debug session that is configured to
// continue on entry with a pre-set breakpoint.
func TestPreSetBreakpoint(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)

		client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
		client.ExpectProcessEvent(t)
		client.ExpectInitializedEvent(t)
		client.ExpectLaunchResponse(t)

		client.SetBreakpointsRequest(fixture.Source, []int{8})
		sResp := client.ExpectSetBreakpointsResponse(t)
		if len(sResp.Body.Breakpoints) != 1 {
			t.Errorf("got %#v, want len(Breakpoints)=1", sResp)
		}
		bkpt0 := sResp.Body.Breakpoints[0]
		if !bkpt0.Verified || bkpt0.Line != 8 || bkpt0.Id != 1 || bkpt0.Source.Name != filepath.Base(fixture.Source) || bkpt0.Source.Path != fixture.Source {
			t.Errorf("got breakpoints[0] = %#v, want Verified=true, Line=8, Id=1, Path=%q", bkpt0, fixture.Source)
		}

		client.SetExceptionBreakpointsRequest()
		client.ExpectSetExceptionBreakpointsResponse(t)

		client.ConfigurationDoneRequest()
		client.ExpectConfigurationDoneResponse(t)
		// This triggers "continue" on a separate goroutine

		client.ThreadsRequest()
		// Since we are in async mode while running, we might receive messages in either order.
		for i := 0; i < 2; i++ {
			msg := client.ExpectMessage(t)
			switch m := msg.(type) {
			case *dap.ThreadsResponse:
				// If the thread request arrived while the program was running, we expect to get the dummy response
				// with a single goroutine "Current".
				// If the thread request arrived after the stop, we should get the goroutine stopped at main.Increment.
				if (len(m.Body.Threads) != 1 || m.Body.Threads[0].Id != -1 || m.Body.Threads[0].Name != "Current") &&
					(len(m.Body.Threads) < 1 || m.Body.Threads[0].Id != 1 || !strings.HasPrefix(m.Body.Threads[0].Name, "* [Go 1] main.Increment")) {
					t.Errorf("\ngot  %#v\nwant Id=-1, Name=\"Current\" or Id=1, Name=\"* [Go 1] main.Increment ...\"", m.Body.Threads)
				}
			case *dap.StoppedEvent:
				if m.Body.Reason != "breakpoint" || m.Body.ThreadId != 1 || !m.Body.AllThreadsStopped {
					t.Errorf("got %#v, want Body={Reason=\"breakpoint\", ThreadId=1, AllThreadsStopped=true}", m)
				}
			default:
				t.Fatalf("got %#v, want ThreadsResponse or StoppedEvent", m)
			}
		}

		// Threads-StackTrace-Scopes-Variables request waterfall is
		// triggered on stop event.
		client.ThreadsRequest()
		tResp := client.ExpectThreadsResponse(t)
		if len(tResp.Body.Threads) < 2 { // 1 main + runtime
			t.Errorf("\ngot  %#v\nwant len(Threads)>1", tResp.Body.Threads)
		}
		reMain := regexp.MustCompile(`\* \[Go 1\] main.Increment \(Thread [0-9]+\)`)
		wantMain := dap.Thread{Id: 1, Name: "* [Go 1] main.Increment (Thread ...)"}
		wantRuntime := dap.Thread{Id: 2, Name: "[Go 2] runtime.gopark"}
		for _, got := range tResp.Body.Threads {
			if got.Id != 1 && !reMain.MatchString(got.Name) && !(strings.Contains(got.Name, "runtime.") || strings.Contains(got.Name, "runtime/")) {
				t.Errorf("\ngot  %#v\nwant []dap.Thread{%#v, %#v, ...}", tResp.Body.Threads, wantMain, wantRuntime)
			}
		}

		client.StackTraceRequest(1, 0, 20)
		stResp := client.ExpectStackTraceResponse(t)

		if stResp.Body.TotalFrames != 6 {
			t.Errorf("\ngot %#v\nwant TotalFrames=6", stResp.Body.TotalFrames)
		}
		if len(stResp.Body.StackFrames) != 6 {
			t.Errorf("\ngot %#v\nwant len(StackFrames)=6", stResp.Body.StackFrames)
		} else {
			checkFrame := func(got dap.StackFrame, id int, name string, sourceName string, line int) {
				t.Helper()
				if got.Id != id || got.Name != name {
					t.Errorf("\ngot  %#v\nwant Id=%d Name=%s", got, id, name)
				}
				if (sourceName != "" && (got.Source == nil || got.Source.Name != sourceName)) || (line > 0 && got.Line != line) {
					t.Errorf("\ngot  %#v\nwant Source.Name=%s Line=%d", got, sourceName, line)
				}
			}
			checkFrame(stResp.Body.StackFrames[0], 1000, "main.Increment", "increment.go", 8)
			checkFrame(stResp.Body.StackFrames[1], 1001, "main.Increment", "increment.go", 11)
			checkFrame(stResp.Body.StackFrames[2], 1002, "main.Increment", "increment.go", 11)
			checkFrame(stResp.Body.StackFrames[3], 1003, "main.main", "increment.go", 17)
			checkFrame(stResp.Body.StackFrames[4], 1004, "runtime.main", "proc.go", -1)
			checkFrame(stResp.Body.StackFrames[5], 1005, "runtime.goexit", "", -1)
		}

		client.ScopesRequest(1000)
		scopes := client.ExpectScopesResponse(t)
		if len(scopes.Body.Scopes) > 1 {
			t.Errorf("\ngot  %#v\nwant len(Scopes)=1 (Locals)", scopes)
		}
		checkScope(t, scopes, 0, "Locals", localsScope)

		client.VariablesRequest(localsScope)
		args := client.ExpectVariablesResponse(t)
		checkChildren(t, args, "Locals", 2)
		checkVarExact(t, args, 0, "y", "y", "0 = 0x0", "uint", noChildren)
		checkVarExact(t, args, 1, "~r1", "", "0 = 0x0", "uint", noChildren)

		client.ContinueRequest(1)
		ctResp := client.ExpectContinueResponse(t)
		if !ctResp.Body.AllThreadsContinued {
			t.Errorf("\ngot  %#v\nwant AllThreadsContinued=true", ctResp.Body)
		}
		// "Continue" is triggered after the response is sent

		client.ExpectTerminatedEvent(t)

		// Pause request after termination should result in an error.
		// But in certain cases this request actually succeeds.
		client.PauseRequest(1)
		switch r := client.ExpectMessage(t).(type) {
		case *dap.ErrorResponse:
			if r.Message != "Unable to halt execution" {
				t.Errorf("\ngot  %#v\nwant Message='Unable to halt execution'", r)
			}
		case *dap.PauseResponse:
		default:
			t.Fatalf("Unexpected response type: expect error or pause, got %#v", r)
		}

		client.DisconnectRequest()
		client.ExpectOutputEventProcessExited(t, 0)
		client.ExpectOutputEventDetaching(t)
		client.ExpectDisconnectResponse(t)
		client.ExpectTerminatedEvent(t)
	})
}

// checkStackFramesExact is a helper for verifying the values within StackTraceResponse.
//
//	wantStartName - name of the first returned frame (ignored if "")
//	wantStartLine - file line of the first returned frame (ignored if <0).
//	wantStartID - id of the first frame returned (ignored if wantFrames is 0).
//	wantFrames - number of frames returned (length of StackTraceResponse.Body.StackFrames array).
//	wantTotalFrames - total number of stack frames available (StackTraceResponse.Body.TotalFrames).
func checkStackFramesExact(t *testing.T, got *dap.StackTraceResponse,
	wantStartName string, wantStartLine interface{}, wantStartID, wantFrames, wantTotalFrames int,
) {
	t.Helper()
	checkStackFramesNamed("", t, got, wantStartName, wantStartLine, wantStartID, wantFrames, wantTotalFrames, true)
}

func TestFilterGoroutines(t *testing.T) {
	tt := []struct {
		name    string
		filter  string
		want    []string
		wantLen int
		wantErr bool
	}{
		{
			name:    "user goroutines",
			filter:  "-with user",
			want:    []string{"main.main", "main.agoroutine"},
			wantLen: 11,
		},
		{
			name:    "filter by user loc",
			filter:  "-with userloc main.main",
			want:    []string{"main.main"},
			wantLen: 1,
		},
		{
			name:    "multiple filters",
			filter:  "-with user -with userloc main.agoroutine",
			want:    []string{"main.agoroutine"},
			wantLen: 10,
		},
		{
			name:   "system goroutines",
			filter: "-without user",
			want:   []string{"runtime."},
		},
		// Filters that should return all goroutines.
		{
			name:    "empty filter string",
			filter:  "",
			want:    []string{"main.main", "main.agoroutine", "runtime."},
			wantLen: -1,
		},
		{
			name:    "bad filter string",
			filter:  "not parsable to filters",
			want:    []string{"main.main", "main.agoroutine", "runtime."},
			wantLen: -1,
			wantErr: true,
		},
		// Filters that should produce none.
		{
			name:    "no match to user loc",
			filter:  "-with userloc main.NotAUserFrame",
			want:    []string{"Dummy"},
			wantLen: 1,
		},
		{
			name:    "no match to user and not user",
			filter:  "-with user -without user",
			want:    []string{"Dummy"},
			wantLen: 1,
		},
	}
	runTest(t, "goroutinestackprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode":        "exec",
					"program":     fixture.Path,
					"stopOnEntry": !stopOnEntry,
				})
			},
			// Set breakpoints
			fixture.Source, []int{30},
			[]onBreakpoint{{
				// Stop at line 30
				execute: func() {
					for _, tc := range tt {
						command := fmt.Sprintf("dlv config goroutineFilters %s", tc.filter)
						client.EvaluateRequest(command, 1000, "repl")
						client.ExpectInvalidatedEvent(t)
						client.ExpectEvaluateResponse(t)

						client.ThreadsRequest()
						if tc.wantErr {
							client.ExpectOutputEvent(t)
						}
						tr := client.ExpectThreadsResponse(t)
						if tc.wantLen > 0 && len(tr.Body.Threads) != tc.wantLen {
							t.Errorf("got Threads=%#v, want Len=%d\n", tr.Body.Threads, tc.wantLen)
						}
						for i, frame := range tr.Body.Threads {
							var found bool
							for _, wantName := range tc.want {
								if strings.Contains(frame.Name, wantName) {
									found = true
									break
								}
							}
							if !found {
								t.Errorf("got Threads[%d]=%#v, want Name=%v\n", i, frame, tc.want)
							}
						}
					}
				},
				disconnect: false,
			}})
	})
}

func checkStackFramesHasMore(t *testing.T, got *dap.StackTraceResponse,
	wantStartName string, wantStartLine, wantStartID, wantFrames, wantTotalFrames int,
) {
	t.Helper()
	checkStackFramesNamed("", t, got, wantStartName, wantStartLine, wantStartID, wantFrames, wantTotalFrames, false)
}

func checkStackFramesNamed(testName string, t *testing.T, got *dap.StackTraceResponse,
	wantStartName string, wantStartLine interface{}, wantStartID, wantFrames, wantTotalFrames int, totalExact bool,
) {
	t.Helper()
	if totalExact && got.Body.TotalFrames != wantTotalFrames {
		t.Errorf("%s\ngot  %#v\nwant TotalFrames=%d", testName, got.Body.TotalFrames, wantTotalFrames)
	} else if !totalExact && got.Body.TotalFrames < wantTotalFrames {
		t.Errorf("%s\ngot  %#v\nwant TotalFrames>=%d", testName, got.Body.TotalFrames, wantTotalFrames)
	}

	if len(got.Body.StackFrames) != wantFrames {
		t.Errorf("%s\ngot  len(StackFrames)=%d\nwant %d", testName, len(got.Body.StackFrames), wantFrames)
	} else {
		// Verify that frame ids are consecutive numbers starting at wantStartID
		for i := 0; i < wantFrames; i++ {
			if got.Body.StackFrames[i].Id != wantStartID+i {
				t.Errorf("%s\ngot  %#v\nwant Id=%d", testName, got.Body.StackFrames[i], wantStartID+i)
			}
		}
		// Verify the name and line corresponding to the first returned frame (if any).
		// This is useful when the first frame is the frame corresponding to the breakpoint at
		// a predefined line.

		startLineOk := true

		switch wantStartLine := wantStartLine.(type) {
		case int:
			if wantStartLine > 0 {
				startLineOk = got.Body.StackFrames[0].Line == wantStartLine
			}
		case []int:
			startLineOk = false
			for _, ln := range wantStartLine {
				if got.Body.StackFrames[0].Line == ln {
					startLineOk = true
					break
				}
			}
		}

		if wantFrames > 0 && !startLineOk {
			t.Errorf("%s\ngot  Line=%d\nwant %d", testName, got.Body.StackFrames[0].Line, wantStartLine)
		}
		if wantFrames > 0 && wantStartName != "" && got.Body.StackFrames[0].Name != wantStartName {
			t.Errorf("%s\ngot  Name=%s\nwant %s", testName, got.Body.StackFrames[0].Name, wantStartName)
		}
	}
}

// checkScope is a helper for verifying the values within a ScopesResponse.
//
//	i - index of the scope within ScopesResponse.Body.Scopes array
//	name - name of the scope
//	varRef - reference to retrieve variables of this scope. If varRef is negative, the reference is not checked.
func checkScope(t *testing.T, got *dap.ScopesResponse, i int, name string, varRef int) {
	t.Helper()
	if len(got.Body.Scopes) <= i {
		t.Errorf("\ngot  %d\nwant len(Scopes)>%d", len(got.Body.Scopes), i)
	}
	goti := got.Body.Scopes[i]
	if goti.Name != name || (varRef >= 0 && goti.VariablesReference != varRef) || goti.Expensive {
		t.Errorf("\ngot  %#v\nwant Name=%q VariablesReference=%d Expensive=false", goti, name, varRef)
	}
}

// checkChildren is a helper for verifying the number of variables within a VariablesResponse.
//
//	parentName - pseudoname of the enclosing variable or scope (used for error message only)
//	numChildren - number of variables/fields/elements of this variable
func checkChildren(t *testing.T, got *dap.VariablesResponse, parentName string, numChildren int) {
	t.Helper()
	if got.Body.Variables == nil {
		t.Errorf("\ngot  %s children=%#v want []", parentName, got.Body.Variables)
	}
	if len(got.Body.Variables) != numChildren {
		t.Errorf("\ngot  len(%s)=%d (children=%#v)\nwant len=%d", parentName, len(got.Body.Variables), got.Body.Variables, numChildren)
	}
}

// checkVar is a helper for verifying the values within a VariablesResponse.
//
//	i - index of the variable within VariablesResponse.Body.Variables array (-1 will search all vars for a match)
//	name - name of the variable
//	evalName - fully qualified variable name or alternative expression to load this variable
//	value - the value of the variable
//	useExactMatch - true if name, evalName and value are to be compared to exactly, false if to be used as regex
//	hasRef - true if the variable should have children and therefore a non-0 variable reference
//	ref - reference to retrieve children of this variable (0 if none)
func checkVar(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, useExactMatch, hasRef bool, indexed, named int) (ref int) {
	t.Helper()
	if len(got.Body.Variables) <= i {
		t.Errorf("\ngot  len=%d (children=%#v)\nwant len>%d", len(got.Body.Variables), got.Body.Variables, i)
		return
	}
	if i < 0 {
		for vi, v := range got.Body.Variables {
			if v.Name == name {
				i = vi
				break
			}
		}
	}
	if i < 0 {
		t.Errorf("\ngot  %#v\nwant Variables[i].Name=%q (not found)", got, name)
		return 0
	}

	goti := got.Body.Variables[i]
	matchedName := false
	if useExactMatch {
		if strings.HasPrefix(name, "~r") {
			matchedName = strings.HasPrefix(goti.Name, "~r")
		} else {
			matchedName = (goti.Name == name)
		}
	} else {
		matchedName, _ = regexp.MatchString(name, goti.Name)
	}
	if !matchedName || (goti.VariablesReference > 0) != hasRef {
		t.Errorf("\ngot  %#v\nwant Name=%q hasRef=%t", goti, name, hasRef)
	}
	matchedEvalName := false
	if useExactMatch {
		matchedEvalName = (goti.EvaluateName == evalName)
	} else {
		matchedEvalName, _ = regexp.MatchString(evalName, goti.EvaluateName)
	}
	if !matchedEvalName {
		t.Errorf("\ngot  %q\nwant EvaluateName=%q", goti.EvaluateName, evalName)
	}
	matchedValue := false
	if useExactMatch {
		matchedValue = (goti.Value == value)
	} else {
		matchedValue, _ = regexp.MatchString(value, goti.Value)
	}
	if !matchedValue {
		t.Errorf("\ngot  %s=%q\nwant %q", name, goti.Value, value)
	}
	matchedType := false
	if useExactMatch {
		matchedType = (goti.Type == typ)
	} else {
		matchedType, _ = regexp.MatchString(typ, goti.Type)
	}
	if !matchedType {
		t.Errorf("\ngot  %s=%q\nwant %q", name, goti.Type, typ)
	}
	if indexed >= 0 && goti.IndexedVariables != indexed {
		t.Errorf("\ngot  %s=%d indexed\nwant %d indexed", name, goti.IndexedVariables, indexed)
	}
	if named >= 0 && goti.NamedVariables != named {
		t.Errorf("\ngot  %s=%d named\nwant %d named", name, goti.NamedVariables, named)
	}
	return goti.VariablesReference
}

// checkVarExact is a helper like checkVar that matches value exactly.
func checkVarExact(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, hasRef bool) (ref int) {
	t.Helper()
	return checkVarExactIndexed(t, got, i, name, evalName, value, typ, hasRef, -1, -1)
}

// checkVarExact is a helper like checkVar that matches value exactly.
func checkVarExactIndexed(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, hasRef bool, indexed, named int) (ref int) {
	t.Helper()
	return checkVar(t, got, i, name, evalName, value, typ, true, hasRef, indexed, named)
}

// checkVarRegex is a helper like checkVar that treats value, evalName or name as a regex.
func checkVarRegex(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, hasRef bool) (ref int) {
	t.Helper()
	return checkVarRegexIndexed(t, got, i, name, evalName, value, typ, hasRef, -1, -1)
}

// checkVarRegex is a helper like checkVar that treats value, evalName or name as a regex.
func checkVarRegexIndexed(t *testing.T, got *dap.VariablesResponse, i int, name, evalName, value, typ string, hasRef bool, indexed, named int) (ref int) {
	t.Helper()
	return checkVar(t, got, i, name, evalName, value, typ, false, hasRef, indexed, named)
}

func expectMessageFilterStopped(t *testing.T, client *daptest.Client) dap.Message {
	msg := client.ExpectMessage(t)
	if _, isStopped := msg.(*dap.StoppedEvent); isStopped {
		msg = client.ExpectMessage(t)
	}
	return msg
}

// validateEvaluateName issues an evaluate request with evaluateName of a variable and
// confirms that it succeeds and returns the same variable record as the original.
func validateEvaluateName(t *testing.T, client *daptest.Client, got *dap.VariablesResponse, i int) {
	t.Helper()
	original := got.Body.Variables[i]
	client.EvaluateRequest(original.EvaluateName, 1000, "this context will be ignored")
	validated := client.ExpectEvaluateResponse(t)
	if original.VariablesReference == 0 && validated.Body.VariablesReference != 0 ||
		original.VariablesReference != 0 && validated.Body.VariablesReference == 0 {
		t.Errorf("\ngot  varref=%d\nwant %d", validated.Body.VariablesReference, original.VariablesReference)
	}
	// The variable might not be fully loaded, and when we reload it with an expression
	// more of the subvalues might be revealed, so we must match the loaded prefix only.
	if strings.Contains(original.Value, "...") {
		origLoaded := strings.Split(original.Value, "...")[0]
		if !strings.HasPrefix(validated.Body.Result, origLoaded) {
			t.Errorf("\ngot  value=%q\nwant %q", validated.Body.Result, original.Value)
		}
	} else if original.Value != validated.Body.Result {
		t.Errorf("\ngot  value=%q\nwant %q", validated.Body.Result, original.Value)
	}
}

// TestStackTraceRequest executes to a breakpoint and tests different
// good and bad configurations of 'stackTrace' requests.
func TestStackTraceRequest(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		var stResp *dap.StackTraceResponse
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{8, 18},
			[]onBreakpoint{{
				// Stop at line 8
				execute: func() {
					// Even though the stack frames do not change,
					// repeated requests at the same breakpoint
					// would assign next block of unique ids to them each time.
					const NumFrames = 6
					reqIndex := 0
					frameID := func() int {
						return startHandle + reqIndex
					}

					tests := map[string]struct {
						startFrame          int
						levels              int
						wantStartName       string
						wantStartLine       int
						wantStartFrame      int
						wantFramesReturned  int
						wantFramesAvailable int
						exact               bool
					}{
						"all frame levels from 0 to NumFrames":    {0, NumFrames, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"subset of frames from 1 to -1":           {1, NumFrames - 1, "main.Increment", 11, 1, NumFrames - 1, NumFrames, true},
						"load stack in pages: first half":         {0, NumFrames / 2, "main.Increment", 8, 0, NumFrames / 2, NumFrames, false},
						"load stack in pages: second half":        {NumFrames / 2, NumFrames, "main.main", 17, NumFrames / 2, NumFrames / 2, NumFrames, true},
						"zero levels means all levels":            {0, 0, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"zero levels means all remaining levels":  {NumFrames / 2, 0, "main.main", 17, NumFrames / 2, NumFrames / 2, NumFrames, true},
						"negative levels treated as 0 (all)":      {0, -10, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"OOB levels is capped at available len":   {0, NumFrames + 1, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"OOB levels is capped at available len 1": {1, NumFrames + 1, "main.Increment", 11, 1, NumFrames - 1, NumFrames, true},
						"negative startFrame treated as 0":        {-10, 0, "main.Increment", 8, 0, NumFrames, NumFrames, true},
						"OOB startFrame returns empty trace":      {NumFrames, 0, "main.Increment", -1, -1, 0, NumFrames, true},
					}
					for name, tc := range tests {
						client.StackTraceRequest(1, tc.startFrame, tc.levels)
						stResp = client.ExpectStackTraceResponse(t)
						checkStackFramesNamed(name, t, stResp,
							tc.wantStartName, tc.wantStartLine, frameID(), tc.wantFramesReturned, tc.wantFramesAvailable, tc.exact)
						reqIndex += len(stResp.Body.StackFrames)
					}
				},
				disconnect: false,
			}, {
				// Stop at line 18
				execute: func() {
					// Frame ids get reset at each breakpoint.
					client.StackTraceRequest(1, 0, 0)
					stResp = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stResp, "main.main", 18, startHandle, 3, 3)
				},
				disconnect: false,
			}})
	})
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		var stResp *dap.StackTraceResponse
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{8, 18},
			[]onBreakpoint{{
				// Stop at line 8
				execute: func() {
					// Even though the stack frames do not change,
					// repeated requests at the same breakpoint
					// would assign next block of unique ids to them each time.
					const NumFrames = 6

					var frames []dap.StackFrame

					for start, levels := 0, 1; start < NumFrames; {
						client.StackTraceRequest(1, start, levels)
						stResp = client.ExpectStackTraceResponse(t)
						frames = append(frames, stResp.Body.StackFrames...)
						if stResp.Body.TotalFrames < NumFrames {
							t.Errorf("got  %#v\nwant TotalFrames>=%d\n", stResp.Body.TotalFrames, NumFrames)
						}

						if len(stResp.Body.StackFrames) < levels {
							t.Errorf("got  len(StackFrames)=%d\nwant >=%d\n", len(stResp.Body.StackFrames), levels)
						}

						start += len(stResp.Body.StackFrames)
					}

					// TODO check all the frames.
					want := []struct {
						wantName string
						wantLine int
					}{
						{"main.Increment", 8},
						{"main.Increment", 11},
						{"main.Increment", 11},
						{"main.main", 17},
						{"runtime.main", 0},
						{"runtime.goexit", 0},
					}
					for i, frame := range frames {
						frameId := startHandle + i
						if frame.Id != frameId {
							t.Errorf("got  %#v\nwant Id=%d\n", frame, frameId)
						}

						// Verify the name and line corresponding to the first returned frame (if any).
						// This is useful when the first frame is the frame corresponding to the breakpoint at
						// a predefined line. Line values < 0 are a signal to skip the check (which can be useful
						// for frames in the third-party code, where we do not control the lines).
						if want[i].wantLine > 0 && frame.Line != want[i].wantLine {
							t.Errorf("got  Line=%d\nwant %d\n", frame.Line, want[i].wantLine)
						}
						if want[i].wantName != "" && frame.Name != want[i].wantName {
							t.Errorf("got  Name=%s\nwant %s\n", frame.Name, want[i].wantName)
						}
					}
				},
				disconnect: false,
			}, {
				// Stop at line 18
				execute: func() {
					// Frame ids get reset at each breakpoint.
					client.StackTraceRequest(1, 0, 0)
					stResp = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stResp, "main.main", 18, startHandle, 3, 3)
				},
				disconnect: false,
			}})
	})
}

func TestFunctionNameFormattingInStackTrace(t *testing.T) {
	runTest(t, "consts", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at line 36
				execute: func() {
					if runtime.GOARCH == "386" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 18) && !goversion.VersionAfterOrEqual(runtime.Version(), 1, 21) {
						client.StepInRequest(1)
						client.ExpectStepInResponse(t)
						client.ExpectStoppedEvent(t)
					}
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", 36, 1000, 3, 3)

					// Step into pkg.AnotherMethod()
					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					client.ExpectStoppedEvent(t)

					client.StackTraceRequest(1, 0, 20)
					stack = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "pkg.(*SomeType).AnotherMethod", 13, 1000, 4, 4)
				},
				disconnect: true,
			}})
	})
}

func Test_fnName(t *testing.T) {
	tests := []struct {
		symbol string
		want   string
	}{
		{
			symbol: "pkg.functionName",
			want:   "pkg.functionName",
		},
		{
			symbol: "github.com/some/long/package/path/pkg.(*SomeType).Method",
			want:   "pkg.(*SomeType).Method",
		},
		{
			symbol: "github.com/some/path/pkg.typeparametric[go.shape.struct { example.com/blah/otherpkg.x int }]",
			want:   "pkg.typeparametric[go.shape.struct { example.com/blah/otherpkg.x int }]",
		},
	}
	for _, tt := range tests {
		t.Run(tt.symbol, func(t *testing.T) {
			loc := proc.Location{Fn: &proc.Function{Name: tt.symbol}}
			if got := fnName(&loc); got != tt.want {
				t.Errorf("fnName() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestSelectedThreadsRequest(t *testing.T) {
	runTest(t, "goroutinestackprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{20},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 20)

					defaultMaxGoroutines := maxGoroutines
					defer func() { maxGoroutines = defaultMaxGoroutines }()

					maxGoroutines = 1
					client.SetBreakpointsRequest(fixture.Source, []int{8})
					client.ExpectSetBreakpointsResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || se.Body.ThreadId == 1 {
						t.Errorf("got %#v, want Reason=%q, ThreadId!=1", se, "breakpoint")
					}

					client.ThreadsRequest()
					oe := client.ExpectOutputEvent(t)
					if !strings.HasPrefix(oe.Body.Output, "Too many goroutines") {
						t.Errorf("got %#v, expected Output=\"Too many goroutines...\"\n", oe)
					}
					tr := client.ExpectThreadsResponse(t)

					if len(tr.Body.Threads) != 2 {
						t.Errorf("got %d threads, expected 2\n", len(tr.Body.Threads))
					}

					var selectedFound bool
					for _, thread := range tr.Body.Threads {
						if thread.Id == se.Body.ThreadId {
							selectedFound = true
							break
						}
					}
					if !selectedFound {
						t.Errorf("got %#v, want ThreadId=%d\n", tr.Body.Threads, se.Body.ThreadId)
					}
				},
				disconnect: true,
			}})
	})
}

func TestGoroutineLabels(t *testing.T) {
	tests := []struct {
		showPprofLabelsConfig   []string
		expectedPrefixWithLabel string
	}{
		{[]string{}, "* [Go 1]"},
		{[]string{"k1"}, "* [Go 1 v1]"},
		{[]string{"k2"}, "* [Go 1 v2]"},
		{[]string{"k2", "k1"}, "* [Go 1 k2:v2 k1:v1]"}, // When passing keys explicitly, we show them in the given order
		{[]string{"unknown"}, "* [Go 1]"},
		{[]string{"unknown", "k1"}, "* [Go 1 k1:v1]"},
		{[]string{"*"}, "* [Go 1 k1:v1 k2:v2]"}, // Special case for showing all labels; labels are shown sorted by key
	}
	for _, tc := range tests {
		runTest(t, "goroutineLabels", func(client *daptest.Client, fixture protest.Fixture) {
			runDebugSessionWithBPs(t, client, "launch",
				// Launch
				func() {
					client.LaunchRequestWithArgs(map[string]interface{}{
						"mode":                 "exec",
						"program":              fixture.Path,
						"hideSystemGoroutines": true,
						"showPprofLabels":      tc.showPprofLabelsConfig,
						"stopOnEntry":          !stopOnEntry,
					})
				},
				// Breakpoints are set within the program
				"", []int{},
				[]onBreakpoint{{
					execute: func() {
						client.ThreadsRequest()
						tr := client.ExpectThreadsResponse(t)
						if len(tr.Body.Threads) != 1 {
							t.Errorf("got %d threads, expected 1\n", len(tr.Body.Threads))
						}
						// The first breakpoint is before the call to pprof.Do; no labels yet:
						expectedPrefix := "* [Go 1]"
						if !strings.HasPrefix(tr.Body.Threads[0].Name, expectedPrefix) {
							t.Errorf("got %s, expected %s\n", tr.Body.Threads[0].Name, expectedPrefix)
						}

						client.ContinueRequest(1)
						client.ExpectContinueResponse(t)
						client.ExpectStoppedEvent(t)
						checkStop(t, client, 1, "main.f", 21)
						client.ThreadsRequest()
						tr = client.ExpectThreadsResponse(t)
						if len(tr.Body.Threads) != 1 {
							t.Errorf("got %d threads, expected 1\n", len(tr.Body.Threads))
						}
						// The second breakpoint is inside pprof.Do, so there are labels:
						if !strings.HasPrefix(tr.Body.Threads[0].Name, tc.expectedPrefixWithLabel) {
							t.Errorf("got %s, expected %s\n", tr.Body.Threads[0].Name, tc.expectedPrefixWithLabel)
						}
					},
					disconnect: true,
				}},
			)
		})
	}
}

func TestHideSystemGoroutinesRequest(t *testing.T) {
	tests := []struct{ hideSystemGoroutines bool }{
		{hideSystemGoroutines: true},
		{hideSystemGoroutines: false},
	}
	for _, tt := range tests {
		runTest(t, "goroutinestackprog", func(client *daptest.Client, fixture protest.Fixture) {
			runDebugSessionWithBPs(t, client, "launch",
				// Launch
				func() {
					client.LaunchRequestWithArgs(map[string]interface{}{
						"mode":                 "exec",
						"program":              fixture.Path,
						"hideSystemGoroutines": tt.hideSystemGoroutines,
						"stopOnEntry":          !stopOnEntry,
					})
				},
				// Set breakpoints
				fixture.Source, []int{25},
				[]onBreakpoint{{
					execute: func() {
						checkStop(t, client, 1, "main.main", 25)

						client.ThreadsRequest()
						tr := client.ExpectThreadsResponse(t)

						// The user process creates 10 goroutines in addition to the
						// main goroutine, for a total of 11 goroutines.
						userCount := 11
						if tt.hideSystemGoroutines {
							if len(tr.Body.Threads) != userCount {
								t.Errorf("got %d goroutines, expected %d\n", len(tr.Body.Threads), userCount)
							}
						} else {
							if len(tr.Body.Threads) <= userCount {
								t.Errorf("got %d goroutines, expected >%d\n", len(tr.Body.Threads), userCount)
							}
						}
					},
					disconnect: true,
				}})
		})
	}
}

// TestScopesAndVariablesRequests executes to a breakpoint and tests different
// configurations of 'scopes' and 'variables' requests.
func TestScopesAndVariablesRequests(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true, "backend": "default",
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at first breakpoint
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)

					checkStackFramesExact(t, stack, "main.foobar", []int{65, 66}, 1000, 4, 4)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)

					// Globals

					client.VariablesRequest(globalsScope)
					globals := client.ExpectVariablesResponse(t)
					checkVarExact(t, globals, 0, "p1", "main.p1", "10", "int", noChildren)

					// Locals

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkChildren(t, locals, "Locals", 33)
					checkVarExact(t, locals, 0, "baz", "baz", `"bazburzum"`, "string", noChildren)
					ref := checkVarExact(t, locals, 1, "bar", "bar", `main.FooBar {Baz: 10, Bur: "lorem"}`, "main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						bar := client.ExpectVariablesResponse(t)
						checkChildren(t, bar, "bar", 2)
						checkVarExact(t, bar, 0, "Baz", "bar.Baz", "10", "int", noChildren)
						checkVarExact(t, bar, 1, "Bur", "bar.Bur", `"lorem"`, "string", noChildren)
						validateEvaluateName(t, client, bar, 0)
						validateEvaluateName(t, client, bar, 1)
					}

					// reflect.Kind == Bool
					checkVarExact(t, locals, -1, "b1", "b1", "true", "bool", noChildren)
					checkVarExact(t, locals, -1, "b2", "b2", "false", "bool", noChildren)
					// reflect.Kind == Int
					checkVarExact(t, locals, -1, "a2", "a2", "6", "int", noChildren)
					checkVarExact(t, locals, -1, "neg", "neg", "-1", "int", noChildren)
					// reflect.Kind == Int8
					checkVarExact(t, locals, -1, "i8", "i8", "1", "int8", noChildren)
					// reflect.Kind == Int16 - see testvariables2
					// reflect.Kind == Int32 - see testvariables2
					// reflect.Kind == Int64 - see testvariables2
					// reflect.Kind == Uint
					// reflect.Kind == Uint8
					checkVarExact(t, locals, -1, "u8", "u8", "255 = 0xff", "uint8", noChildren)
					// reflect.Kind == Uint16
					checkVarExact(t, locals, -1, "u16", "u16", "65535 = 0xffff", "uint16", noChildren)
					// reflect.Kind == Uint32
					checkVarExact(t, locals, -1, "u32", "u32", "4294967295 = 0xffffffff", "uint32", noChildren)
					// reflect.Kind == Uint64
					checkVarExact(t, locals, -1, "u64", "u64", "18446744073709551615 = 0xffffffffffffffff", "uint64", noChildren)
					// reflect.Kind == Uintptr
					checkVarExact(t, locals, -1, "up", "up", "5 = 0x5", "uintptr", noChildren)
					// reflect.Kind == Float32
					checkVarExact(t, locals, -1, "f32", "f32", "1.2", "float32", noChildren)
					// reflect.Kind == Float64
					checkVarExact(t, locals, -1, "a3", "a3", "7.23", "float64", noChildren)
					// reflect.Kind == Complex64
					ref = checkVarExact(t, locals, -1, "c64", "c64", "(1 + 2i)", "complex64", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						c64 := client.ExpectVariablesResponse(t)
						checkChildren(t, c64, "c64", 2)
						checkVarExact(t, c64, 0, "real", "", "1", "float32", noChildren)
						checkVarExact(t, c64, 1, "imaginary", "", "2", "float32", noChildren)
					}
					// reflect.Kind == Complex128
					ref = checkVarExact(t, locals, -1, "c128", "c128", "(2 + 3i)", "complex128", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						c128 := client.ExpectVariablesResponse(t)
						checkChildren(t, c128, "c128", 2)
						checkVarExact(t, c128, 0, "real", "", "2", "float64", noChildren)
						checkVarExact(t, c128, 1, "imaginary", "", "3", "float64", noChildren)
					}
					// reflect.Kind == Array
					ref = checkVarExact(t, locals, -1, "a4", "a4", "[2]int [1,2]", "[2]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a4 := client.ExpectVariablesResponse(t)
						checkChildren(t, a4, "a4", 2)
						checkVarExact(t, a4, 0, "[0]", "a4[0]", "1", "int", noChildren)
						checkVarExact(t, a4, 1, "[1]", "a4[1]", "2", "int", noChildren)
					}
					ref = checkVarExact(t, locals, -1, "a11", "a11", `[3]main.FooBar [{Baz: 1, Bur: "a"},{Baz: 2, Bur: "b"},{Baz: 3, Bur: "c"}]`, "[3]main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a11 := client.ExpectVariablesResponse(t)
						checkChildren(t, a11, "a11", 3)
						checkVarExact(t, a11, 0, "[0]", "a11[0]", `main.FooBar {Baz: 1, Bur: "a"}`, "main.FooBar", hasChildren)
						ref = checkVarExact(t, a11, 1, "[1]", "a11[1]", `main.FooBar {Baz: 2, Bur: "b"}`, "main.FooBar", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a11_1 := client.ExpectVariablesResponse(t)
							checkChildren(t, a11_1, "a11[1]", 2)
							checkVarExact(t, a11_1, 0, "Baz", "a11[1].Baz", "2", "int", noChildren)
							checkVarExact(t, a11_1, 1, "Bur", "a11[1].Bur", `"b"`, "string", noChildren)
							validateEvaluateName(t, client, a11_1, 0)
							validateEvaluateName(t, client, a11_1, 1)
						}
						checkVarExact(t, a11, 2, "[2]", "a11[2]", `main.FooBar {Baz: 3, Bur: "c"}`, "main.FooBar", hasChildren)
					}

					// reflect.Kind == Chan - see testvariables2
					// reflect.Kind == Func - see testvariables2
					// reflect.Kind == Interface - see testvariables2
					// reflect.Kind == Map - see testvariables2
					// reflect.Kind == Ptr
					ref = checkVarExact(t, locals, -1, "a7", "a7", `*main.FooBar {Baz: 5, Bur: "strum"}`, "*main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a7 := client.ExpectVariablesResponse(t)
						checkChildren(t, a7, "a7", 1)
						ref = checkVarExact(t, a7, 0, "", "(*a7)", `main.FooBar {Baz: 5, Bur: "strum"}`, "main.FooBar", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a7val := client.ExpectVariablesResponse(t)
							checkChildren(t, a7val, "*a7", 2)
							checkVarExact(t, a7val, 0, "Baz", "(*a7).Baz", "5", "int", noChildren)
							checkVarExact(t, a7val, 1, "Bur", "(*a7).Bur", `"strum"`, "string", noChildren)
							validateEvaluateName(t, client, a7val, 0)
							validateEvaluateName(t, client, a7val, 1)
						}
					}
					// TODO(polina): how to test for "nil" (without type) and "void"?
					checkVarExact(t, locals, -1, "a9", "a9", "*main.FooBar nil", "*main.FooBar", noChildren)
					// reflect.Kind == Slice
					ref = checkVarExact(t, locals, -1, "a5", "a5", "[]int len: 5, cap: 5, [1,2,3,4,5]", "[]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a5 := client.ExpectVariablesResponse(t)
						checkChildren(t, a5, "a5", 5)
						checkVarExact(t, a5, 0, "[0]", "a5[0]", "1", "int", noChildren)
						checkVarExact(t, a5, 4, "[4]", "a5[4]", "5", "int", noChildren)
						validateEvaluateName(t, client, a5, 0)
						validateEvaluateName(t, client, a5, 1)
					}
					ref = checkVarExact(t, locals, -1, "a12", "a12", `[]main.FooBar len: 2, cap: 2, [{Baz: 4, Bur: "d"},{Baz: 5, Bur: "e"}]`, "[]main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a12 := client.ExpectVariablesResponse(t)
						checkChildren(t, a12, "a12", 2)
						checkVarExact(t, a12, 0, "[0]", "a12[0]", `main.FooBar {Baz: 4, Bur: "d"}`, "main.FooBar", hasChildren)
						ref = checkVarExact(t, a12, 1, "[1]", "a12[1]", `main.FooBar {Baz: 5, Bur: "e"}`, "main.FooBar", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a12_1 := client.ExpectVariablesResponse(t)
							checkChildren(t, a12_1, "a12[1]", 2)
							checkVarExact(t, a12_1, 0, "Baz", "a12[1].Baz", "5", "int", noChildren)
							checkVarExact(t, a12_1, 1, "Bur", "a12[1].Bur", `"e"`, "string", noChildren)
							validateEvaluateName(t, client, a12_1, 0)
							validateEvaluateName(t, client, a12_1, 1)
						}
					}
					ref = checkVarExact(t, locals, -1, "a13", "a13", `[]*main.FooBar len: 3, cap: 3, [*{Baz: 6, Bur: "f"},*{Baz: 7, Bur: "g"},*{Baz: 8, Bur: "h"}]`, "[]*main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a13 := client.ExpectVariablesResponse(t)
						checkChildren(t, a13, "a13", 3)
						checkVarExact(t, a13, 0, "[0]", "a13[0]", `*main.FooBar {Baz: 6, Bur: "f"}`, "*main.FooBar", hasChildren)
						checkVarExact(t, a13, 1, "[1]", "a13[1]", `*main.FooBar {Baz: 7, Bur: "g"}`, "*main.FooBar", hasChildren)
						ref = checkVarExact(t, a13, 2, "[2]", "a13[2]", `*main.FooBar {Baz: 8, Bur: "h"}`, "*main.FooBar", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a13_2 := client.ExpectVariablesResponse(t)
							checkChildren(t, a13_2, "a13[2]", 1)
							ref = checkVarExact(t, a13_2, 0, "", "(*a13[2])", `main.FooBar {Baz: 8, Bur: "h"}`, "main.FooBar", hasChildren)
							validateEvaluateName(t, client, a13_2, 0)
							if ref > 0 {
								client.VariablesRequest(ref)
								val := client.ExpectVariablesResponse(t)
								checkChildren(t, val, "*a13[2]", 2)
								checkVarExact(t, val, 0, "Baz", "(*a13[2]).Baz", "8", "int", noChildren)
								checkVarExact(t, val, 1, "Bur", "(*a13[2]).Bur", `"h"`, "string", noChildren)
								validateEvaluateName(t, client, val, 0)
								validateEvaluateName(t, client, val, 1)
							}
						}
					}
					// reflect.Kind == String
					checkVarExact(t, locals, -1, "a1", "a1", `"foofoofoofoofoofoo"`, "string", noChildren)
					checkVarExact(t, locals, -1, "a10", "a10", `"ofo"`, "string", noChildren)
					// reflect.Kind == Struct
					ref = checkVarExact(t, locals, -1, "a6", "a6", `main.FooBar {Baz: 8, Bur: "word"}`, "main.FooBar", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a6 := client.ExpectVariablesResponse(t)
						checkChildren(t, a6, "a6", 2)
						checkVarExact(t, a6, 0, "Baz", "a6.Baz", "8", "int", noChildren)
						checkVarExact(t, a6, 1, "Bur", "a6.Bur", `"word"`, "string", noChildren)
					}
					ref = checkVarExact(t, locals, -1, "a8", "a8", `main.FooBar2 {Bur: 10, Baz: "feh"}`, "main.FooBar2", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a8 := client.ExpectVariablesResponse(t)
						checkChildren(t, a8, "a8", 2)
						checkVarExact(t, a8, 0, "Bur", "a8.Bur", "10", "int", noChildren)
						checkVarExact(t, a8, 1, "Baz", "a8.Baz", `"feh"`, "string", noChildren)
					}
					// reflect.Kind == UnsafePointer - see testvariables2
				},
				disconnect: false,
			}, {
				// Stop at second breakpoint
				execute: func() {
					// Frame ids get reset at each breakpoint.
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.barfoo", 27, 1000, 5, 5)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)

					client.ScopesRequest(1111)
					erres := client.ExpectInvisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to list locals: unknown frame id 1111") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to list locals: unknown frame id 1111\"", erres)
					}

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkChildren(t, locals, "Locals", 1)
					checkVarExact(t, locals, -1, "a1", "a1", `"bur"`, "string", noChildren)

					client.VariablesRequest(globalsScope)
					globals := client.ExpectVariablesResponse(t)
					checkVarExact(t, globals, 0, "p1", "main.p1", "10", "int", noChildren)

					client.VariablesRequest(7777)
					erres = client.ExpectInvisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to lookup variable: unknown reference 7777") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to lookup variable: unknown reference 7777\"", erres)
					}
				},
				disconnect: false,
			}})
	})
}

// TestScopesAndVariablesRequests2 executes to a breakpoint and tests different
// configurations of 'scopes' and 'variables' requests.
func TestScopesAndVariablesRequests2(t *testing.T) {
	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", -1, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
				},
				disconnect: false,
			}, {
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", -1, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					if len(scopes.Body.Scopes) > 1 {
						t.Errorf("\ngot  %#v\nwant len(scopes)=1 (Arguments & Locals)", scopes)
					}
					checkScope(t, scopes, 0, "Locals", localsScope)

					// Locals
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					// reflect.Kind == Bool - see testvariables
					// reflect.Kind == Int - see testvariables
					// reflect.Kind == Int8
					checkVarExact(t, locals, -1, "ni8", "ni8", "-5", "int8", noChildren)
					// reflect.Kind == Int16
					checkVarExact(t, locals, -1, "ni16", "ni16", "-5", "int16", noChildren)
					// reflect.Kind == Int32
					checkVarExact(t, locals, -1, "ni32", "ni32", "-5", "int32", noChildren)
					// reflect.Kind == Int64
					checkVarExact(t, locals, -1, "ni64", "ni64", "-5", "int64", noChildren)
					// reflect.Kind == Uint
					// reflect.Kind == Uint8 - see testvariables
					// reflect.Kind == Uint16 - see testvariables
					// reflect.Kind == Uint32 - see testvariables
					// reflect.Kind == Uint64 - see testvariables
					// reflect.Kind == Uintptr - see testvariables
					// reflect.Kind == Float32 - see testvariables
					// reflect.Kind == Float64
					checkVarExact(t, locals, -1, "pinf", "pinf", "+Inf", "float64", noChildren)
					checkVarExact(t, locals, -1, "ninf", "ninf", "-Inf", "float64", noChildren)
					checkVarExact(t, locals, -1, "nan", "nan", "NaN", "float64", noChildren)
					// reflect.Kind == Complex64 - see testvariables
					// reflect.Kind == Complex128 - see testvariables
					// reflect.Kind == Array
					checkVarExact(t, locals, -1, "a0", "a0", "[0]int []", "[0]int", noChildren)
					// reflect.Kind == Chan
					ref := checkVarExact(t, locals, -1, "ch1", "ch1", "chan int 4/11", "chan int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						ch1 := client.ExpectVariablesResponse(t)
						checkVarExact(t, ch1, 0, "qcount", "ch1.qcount", "4 = 0x4", "uint", noChildren)
						validateEvaluateName(t, client, ch1, 0)
						validateEvaluateName(t, client, ch1, 10)
					}
					checkVarExact(t, locals, -1, "chnil", "chnil", "chan int nil", "chan int", noChildren)
					// reflect.Kind == Func
					checkVarExact(t, locals, -1, "fn1", "fn1", "main.afunc", "main.functype", noChildren)
					checkVarExact(t, locals, -1, "fn2", "fn2", "nil", "main.functype", noChildren)
					// reflect.Kind == Interface
					checkVarExact(t, locals, -1, "ifacenil", "ifacenil", "interface {} nil", "interface {}", noChildren)
					ref = checkVarExact(t, locals, -1, "iface2", "iface2", "interface {}(string) \"test\"", "interface {}(string)", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						iface2 := client.ExpectVariablesResponse(t)
						checkChildren(t, iface2, "iface2", 1)
						checkVarExact(t, iface2, 0, "data", "iface2.(data)", `"test"`, "string", noChildren)
						validateEvaluateName(t, client, iface2, 0)
					}
					ref = checkVarExact(t, locals, -1, "iface4", "iface4", "interface {}([]go/constant.Value) [4]", "interface {}([]go/constant.Value)", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						iface4 := client.ExpectVariablesResponse(t)
						checkChildren(t, iface4, "iface4", 1)
						ref = checkVarExact(t, iface4, 0, "data", "iface4.(data)", "[]go/constant.Value len: 1, cap: 1, [4]", "[]go/constant.Value", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							iface4data := client.ExpectVariablesResponse(t)
							checkChildren(t, iface4data, "iface4.data", 1)
							ref = checkVarExact(t, iface4data, 0, "[0]", "iface4.(data)[0]", "go/constant.Value(go/constant.int64Val) 4", "go/constant.Value(go/constant.int64Val)", hasChildren)
							if ref > 0 {
								client.VariablesRequest(ref)
								iface4data0 := client.ExpectVariablesResponse(t)
								checkChildren(t, iface4data0, "iface4.data[0]", 1)
								checkVarExact(t, iface4data0, 0, "data", "iface4.(data)[0].(data)", "4", "go/constant.int64Val", noChildren)
								validateEvaluateName(t, client, iface4data0, 0)
							}
						}
					}
					checkVarExact(t, locals, -1, "errnil", "errnil", "error nil", "error", noChildren)
					ref = checkVarExact(t, locals, -1, "err1", "err1", "error(*main.astruct) *{A: 1, B: 2}", "error(*main.astruct)", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						err1 := client.ExpectVariablesResponse(t)
						checkChildren(t, err1, "err1", 1)
						checkVarExact(t, err1, 0, "data", "err1.(data)", "*main.astruct {A: 1, B: 2}", "*main.astruct", hasChildren)
						validateEvaluateName(t, client, err1, 0)
					}
					ref = checkVarExact(t, locals, -1, "ptrinf", "ptrinf", "*interface {}(**interface {}) **...", "*interface {}", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						ptrinf_val := client.ExpectVariablesResponse(t)
						checkChildren(t, ptrinf_val, "*ptrinf", 1)
						ref = checkVarExact(t, ptrinf_val, 0, "", "(*ptrinf)", "interface {}(**interface {}) **...", "interface {}(**interface {})", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							ptrinf_val_data := client.ExpectVariablesResponse(t)
							checkChildren(t, ptrinf_val_data, "(*ptrinf).data", 1)
							checkVarExact(t, ptrinf_val_data, 0, "data", "(*ptrinf).(data)", "**interface {}(**interface {}) ...", "**interface {}", hasChildren)
							validateEvaluateName(t, client, ptrinf_val_data, 0)
						}
					}
					// reflect.Kind == Map
					checkVarExact(t, locals, -1, "mnil", "mnil", "map[string]main.astruct nil", "map[string]main.astruct", noChildren)
					// key - scalar, value - compound
					ref = checkVarExact(t, locals, -1, "m2", "m2", "map[int]*main.astruct [1: *{A: 10, B: 11}, ]", "map[int]*main.astruct", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						m2 := client.ExpectVariablesResponse(t)
						checkChildren(t, m2, "m2", 2) // each key-value represented by a single child
						checkVarExact(t, m2, 0, "len()", "len(m2)", "1", "int", noChildren)
						ref = checkVarExact(t, m2, 1, "1", "m2[1]", "*main.astruct {A: 10, B: 11}", "int: *main.astruct", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							m2kv1 := client.ExpectVariablesResponse(t)
							checkChildren(t, m2kv1, "m2[1]", 1)
							ref = checkVarExact(t, m2kv1, 0, "", "(*m2[1])", "main.astruct {A: 10, B: 11}", "main.astruct", hasChildren)
							if ref > 0 {
								client.VariablesRequest(ref)
								m2kv1deref := client.ExpectVariablesResponse(t)
								checkChildren(t, m2kv1deref, "*m2[1]", 2)
								checkVarExact(t, m2kv1deref, 0, "A", "(*m2[1]).A", "10", "int", noChildren)
								checkVarExact(t, m2kv1deref, 1, "B", "(*m2[1]).B", "11", "int", noChildren)
								validateEvaluateName(t, client, m2kv1deref, 0)
								validateEvaluateName(t, client, m2kv1deref, 1)
							}
						}
					}
					// key - compound, value - scalar
					ref = checkVarExact(t, locals, -1, "m3", "m3", "map[main.astruct]int [{A: 1, B: 1}: 42, {A: 2, B: 2}: 43, ]", "map[main.astruct]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						m3 := client.ExpectVariablesResponse(t)
						checkChildren(t, m3, "m3", 3) // each key-value represented by a single child
						checkVarExact(t, m3, 0, "len()", "len(m3)", "2", "int", noChildren)
						ref = checkVarRegex(t, m3, 1, `main\.astruct {A: 1, B: 1}`, `m3\[\(\*\(\*"main.astruct"\)\(0x[0-9a-f]+\)\)\]`, "42", "int", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							m3kv0 := client.ExpectVariablesResponse(t)
							checkChildren(t, m3kv0, "m3[0]", 2)
							checkVarRegex(t, m3kv0, 0, "A", `\(*\(*"main\.astruct"\)\(0x[0-9a-f]+\)\)\.A`, "1", "int", noChildren)
							validateEvaluateName(t, client, m3kv0, 0)
						}
						ref = checkVarRegex(t, m3, 2, `main\.astruct {A: 2, B: 2}`, `m3\[\(\*\(\*"main.astruct"\)\(0x[0-9a-f]+\)\)\]`, "43", "", hasChildren)
						if ref > 0 { // inspect another key from another key-value child
							client.VariablesRequest(ref)
							m3kv1 := client.ExpectVariablesResponse(t)
							checkChildren(t, m3kv1, "m3[1]", 2)
							checkVarRegex(t, m3kv1, 1, "B", `\(*\(*"main\.astruct"\)\(0x[0-9a-f]+\)\)\.B`, "2", "int", noChildren)
							validateEvaluateName(t, client, m3kv1, 1)
						}
					}
					// key - compound, value - compound
					ref = checkVarExact(t, locals, -1, "m4", "m4", "map[main.astruct]main.astruct [{A: 1, B: 1}: {A: 11, B: 11}, {A: 2, B: 2}: {A: 22, B: 22}, ]", "map[main.astruct]main.astruct", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						m4 := client.ExpectVariablesResponse(t)
						checkChildren(t, m4, "m4", 5) // each key and value represented by a child, so double the key-value count
						checkVarExact(t, m4, 0, "len()", "len(m4)", "2", "int", noChildren)
						checkVarRegex(t, m4, 1, `\[key 0\]`, `\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)`, `main\.astruct {A: 1, B: 1}`, `main\.astruct`, hasChildren)
						checkVarRegex(t, m4, 2, `\[val 0\]`, `m4\[\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\]`, `main\.astruct {A: 11, B: 11}`, `main\.astruct`, hasChildren)
						ref = checkVarRegex(t, m4, 3, `\[key 1\]`, `\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)`, `main\.astruct {A: 2, B: 2}`, `main\.astruct`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							m4Key1 := client.ExpectVariablesResponse(t)
							checkChildren(t, m4Key1, "m4Key1", 2)
							checkVarRegex(t, m4Key1, 0, "A", `\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\.A`, "2", "int", noChildren)
							checkVarRegex(t, m4Key1, 1, "B", `\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\.B`, "2", "int", noChildren)
							validateEvaluateName(t, client, m4Key1, 0)
							validateEvaluateName(t, client, m4Key1, 1)
						}
						ref = checkVarRegex(t, m4, 4, `\[val 1\]`, `m4\[\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\]`, `main\.astruct {A: 22, B: 22}`, "main.astruct", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							m4Val1 := client.ExpectVariablesResponse(t)
							checkChildren(t, m4Val1, "m4Val1", 2)
							checkVarRegex(t, m4Val1, 0, "A", `m4\[\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\]\.A`, "22", "int", noChildren)
							checkVarRegex(t, m4Val1, 1, "B", `m4\[\(\*\(\*"main\.astruct"\)\(0x[0-9a-f]+\)\)\]\.B`, "22", "int", noChildren)
							validateEvaluateName(t, client, m4Val1, 0)
							validateEvaluateName(t, client, m4Val1, 1)
						}
					}
					checkVarExact(t, locals, -1, "emptymap", "emptymap", "map[string]string []", "map[string]string", noChildren)
					// reflect.Kind == Ptr
					ref = checkVarExact(t, locals, -1, "pp1", "pp1", "**1", "**int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						pp1val := client.ExpectVariablesResponse(t)
						checkChildren(t, pp1val, "*pp1", 1)
						ref = checkVarExact(t, pp1val, 0, "", "(*pp1)", "*1", "*int", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							pp1valval := client.ExpectVariablesResponse(t)
							checkChildren(t, pp1valval, "*(*pp1)", 1)
							checkVarExact(t, pp1valval, 0, "", "(*(*pp1))", "1", "int", noChildren)
							validateEvaluateName(t, client, pp1valval, 0)
						}
					}
					// reflect.Kind == Slice
					ref = checkVarExact(t, locals, -1, "zsslice", "zsslice", "[]struct {} len: 3, cap: 3, [{},{},{}]", "[]struct {}", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						zsslice := client.ExpectVariablesResponse(t)
						checkChildren(t, zsslice, "zsslice", 3)
						checkVarExact(t, zsslice, 2, "[2]", "zsslice[2]", "struct {} {}", "struct {}", noChildren)
						validateEvaluateName(t, client, zsslice, 2)
					}
					checkVarExact(t, locals, -1, "emptyslice", "emptyslice", "[]string len: 0, cap: 0, []", "[]string", noChildren)
					checkVarExact(t, locals, -1, "nilslice", "nilslice", "[]int len: 0, cap: 0, nil", "[]int", noChildren)
					// reflect.Kind == String
					checkVarExact(t, locals, -1, "longstr", "longstr", longstr, "string", noChildren)
					// reflect.Kind == Struct
					checkVarExact(t, locals, -1, "zsvar", "zsvar", "struct {} {}", "struct {}", noChildren)
					// reflect.Kind == UnsafePointer
					// TODO(polina): how do I test for unsafe.Pointer(nil)?
					checkVarRegex(t, locals, -1, "upnil", "upnil", `unsafe\.Pointer\(0x0\)`, "int", noChildren)
					checkVarRegex(t, locals, -1, "up1", "up1", `unsafe\.Pointer\(0x[0-9a-f]+\)`, "int", noChildren)

					// Test unreadable variable
					ref = checkVarRegex(t, locals, -1, "unread", "unread", `\*\(unreadable .+\)`, "int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						val := client.ExpectVariablesResponse(t)
						checkChildren(t, val, "*unread", 1)
						checkVarRegex(t, val, 0, "^$", `\(\*unread\)`, `\(unreadable .+\)`, "int", noChildren)
						validateEvaluateName(t, client, val, 0)
					}
				},
				disconnect: true,
			}})
	})
}

// TestScopesRequestsOptimized executes to a breakpoint and tests different
// that the name of the "Locals" scope is correctly annotated with
// a warning about debugging an optimized function.
func TestScopesRequestsOptimized(t *testing.T) {
	runTestBuildFlags(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at first breakpoint
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)

					checkStackFramesExact(t, stack, "main.foobar", -1, 1000, 4, 4)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals (warning: optimized function)", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)
				},
				disconnect: false,
			}, {
				// Stop at second breakpoint
				execute: func() {
					// Frame ids get reset at each breakpoint.
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.barfoo", 27, 1000, 5, 5)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals (warning: optimized function)", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)
				},
				disconnect: false,
			}})
	},
		protest.EnableOptimization, false)
}

// TestVariablesLoading exposes test cases where variables might be partially or
// fully unloaded.
func TestVariablesLoading(t *testing.T) {
	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute:    func() {},
				disconnect: false,
			}, {
				execute: func() {
					// Change default config values to trigger certain unloaded corner cases
					saveDefaultConfig := DefaultLoadConfig
					DefaultLoadConfig.MaxStructFields = 5
					DefaultLoadConfig.MaxStringLen = 64
					// Set the MaxArrayValues = 33 to execute a bug for map handling where
					// a request for  2*MaxArrayValues indexed map children would not correctly
					// reslice the map. See https://github.com/golang/vscode-go/issues/2351.
					DefaultLoadConfig.MaxArrayValues = 33
					defer func() {
						DefaultLoadConfig = saveDefaultConfig
					}()

					client.StackTraceRequest(1, 0, 0)
					client.ExpectStackTraceResponse(t)

					client.ScopesRequest(1000)
					client.ExpectScopesResponse(t)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					// String partially missing based on LoadConfig.MaxStringLen
					// See also TestVariableLoadingOfLongStrings
					checkVarExact(t, locals, -1, "longstr", "longstr", longstrLoaded64, "string", noChildren)

					checkArrayChildren := func(t *testing.T, longarr *dap.VariablesResponse, parentName string, start int) {
						t.Helper()
						for i, child := range longarr.Body.Variables {
							idx := start + i
							if child.Name != fmt.Sprintf("[%d]", idx) || child.EvaluateName != fmt.Sprintf("%s[%d]", parentName, idx) {
								t.Errorf("Expected %s[%d] to have Name=\"[%d]\" EvaluateName=\"%s[%d]\", got %#v", parentName, idx, idx, parentName, idx, child)
							}
						}
					}

					// Array not fully loaded based on LoadConfig.MaxArrayValues.
					// Expect to be able to load array by paging.
					ref := checkVarExactIndexed(t, locals, -1, "longarr", "longarr", "[100]int [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,...+67 more]", "[100]int", hasChildren, 100, 0)
					if ref > 0 {
						client.VariablesRequest(ref)
						longarr := client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longarr", 33)
						checkArrayChildren(t, longarr, "longarr", 0)

						client.IndexedVariablesRequest(ref, 0, 100)
						longarr = client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longarr", 100)
						checkArrayChildren(t, longarr, "longarr", 0)

						client.IndexedVariablesRequest(ref, 50, 50)
						longarr = client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longarr", 50)
						checkArrayChildren(t, longarr, "longarr", 50)
					}

					// Slice not fully loaded based on LoadConfig.MaxArrayValues.
					// Expect to be able to load slice by paging.
					ref = checkVarExactIndexed(t, locals, -1, "longslice", "longslice", "[]int len: 100, cap: 100, [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,...+67 more]", "[]int", hasChildren, 100, 0)
					if ref > 0 {
						client.VariablesRequest(ref)
						longarr := client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longslice", 33)
						checkArrayChildren(t, longarr, "longslice", 0)

						client.IndexedVariablesRequest(ref, 0, 100)
						longarr = client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longslice", 100)
						checkArrayChildren(t, longarr, "longslice", 0)

						client.IndexedVariablesRequest(ref, 50, 50)
						longarr = client.ExpectVariablesResponse(t)
						checkChildren(t, longarr, "longslice", 50)
						checkArrayChildren(t, longarr, "longslice", 50)
					}

					// Map not fully loaded based on LoadConfig.MaxArrayValues
					// Expect to be able to load map by paging.
					ref = checkVarRegexIndexed(t, locals, -1, "m1", "m1", `map\[string\]main\.astruct \[.+\.\.\.`, `map\[string\]main\.astruct`, hasChildren, 66, 1)
					if ref > 0 {
						client.VariablesRequest(ref)
						m1 := client.ExpectVariablesResponse(t)
						checkChildren(t, m1, "m1", 34)

						client.IndexedVariablesRequest(ref, 0, 66)
						m1 = client.ExpectVariablesResponse(t)
						checkChildren(t, m1, "m1", 66)

						client.IndexedVariablesRequest(ref, 0, 33)
						m1part1 := client.ExpectVariablesResponse(t)
						checkChildren(t, m1part1, "m1", 33)

						client.IndexedVariablesRequest(ref, 33, 33)
						m1part2 := client.ExpectVariablesResponse(t)
						checkChildren(t, m1part2, "m1", 33)

						if len(m1part1.Body.Variables)+len(m1part2.Body.Variables) == len(m1.Body.Variables) {
							for i, got := range m1part1.Body.Variables {
								want := m1.Body.Variables[i]
								if got.Name != want.Name || got.Value != want.Value {
									t.Errorf("got %#v, want Name=%q Value=%q", got, want.Name, want.Value)
								}
							}
							for i, got := range m1part2.Body.Variables {
								want := m1.Body.Variables[i+len(m1part1.Body.Variables)]
								if got.Name != want.Name || got.Value != want.Value {
									t.Errorf("got %#v, want Name=%q Value=%q", got, want.Name, want.Value)
								}
							}
						}
						client.NamedVariablesRequest(ref)
						named := client.ExpectVariablesResponse(t)
						checkChildren(t, named, "m1", 1)
						checkVarExact(t, named, 0, "len()", "len(m1)", "66", "int", noChildren)
					}

					// Struct partially missing based on LoadConfig.MaxStructFields
					ref = checkVarExact(t, locals, -1, "sd", "sd", "(loaded 5/6) main.D {u1: 0, u2: 0, u3: 0, u4: 0, u5: 0,...+1 more}", "main.D", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						sd := client.ExpectVariablesResponse(t)
						checkChildren(t, sd, "sd", 5)
					}

					// Fully missing struct auto-loaded when reaching LoadConfig.MaxVariableRecurse (also tests evaluateName corner case)
					ref = checkVarRegex(t, locals, -1, "c1", "c1", `main\.cstruct {pb: \*main\.bstruct {a: \(\*main\.astruct\)\(0x[0-9a-f]+\)}, sa: []\*main\.astruct len: 3, cap: 3, [\*\(\*main\.astruct\)\(0x[0-9a-f]+\),\*\(\*main\.astruct\)\(0x[0-9a-f]+\),\*\(\*main.astruct\)\(0x[0-9a-f]+\)]}`, `main\.cstruct`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						c1 := client.ExpectVariablesResponse(t)
						checkChildren(t, c1, "c1", 2)
						ref = checkVarRegex(t, c1, 1, "sa", `c1\.sa`, `\[\]\*main\.astruct len: 3, cap: 3, \[\*\(\*main\.astruct\)\(0x[0-9a-f]+\),\*\(\*main\.astruct\)\(0x[0-9a-f]+\),\*\(\*main\.astruct\)\(0x[0-9a-f]+\)\]`, `\[\]\*main\.astruct`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							c1sa := client.ExpectVariablesResponse(t)
							checkChildren(t, c1sa, "c1.sa", 3)
							ref = checkVarRegex(t, c1sa, 0, `\[0\]`, `c1\.sa\[0\]`, `\*\(\*main\.astruct\)\(0x[0-9a-f]+\)`, `\*main\.astruct`, hasChildren)
							if ref > 0 {
								// Auto-loading of fully missing struct children happens here
								client.VariablesRequest(ref)
								c1sa0 := client.ExpectVariablesResponse(t)
								checkChildren(t, c1sa0, "c1.sa[0]", 1)
								// TODO(polina): there should be children here once we support auto loading
								checkVarExact(t, c1sa0, 0, "", "(*c1.sa[0])", "main.astruct {A: 1, B: 2}", "main.astruct", hasChildren)
							}
						}
					}

					// Fully missing struct auto-loaded when hitting LoadConfig.MaxVariableRecurse (also tests evaluateName corner case)
					ref = checkVarRegex(t, locals, -1, "aas", "aas", `\[\]main\.a len: 1, cap: 1, \[{aas: \[\]main\.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]}\]`, `\[\]main\.a`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						aas := client.ExpectVariablesResponse(t)
						checkChildren(t, aas, "aas", 1)
						ref = checkVarRegex(t, aas, 0, "[0]", `aas\[0\]`, `main\.a {aas: \[\]main.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]}`, `main\.a`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							aas0 := client.ExpectVariablesResponse(t)
							checkChildren(t, aas0, "aas[0]", 1)
							ref = checkVarRegex(t, aas0, 0, "aas", `aas\[0\]\.aas`, `\[\]main\.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]`, `\[\]main\.a`, hasChildren)
							if ref > 0 {
								// Auto-loading of fully missing struct children happens here
								client.VariablesRequest(ref)
								aas0aas := client.ExpectVariablesResponse(t)
								checkChildren(t, aas0aas, "aas[0].aas", 1)
								// TODO(polina): there should be a child here once we support auto loading - test for "aas[0].aas[0].aas"
								ref = checkVarRegex(t, aas0aas, 0, "[0]", `aas\[0\]\.aas\[0\]`, `main\.a {aas: \[\]main\.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]}`, "main.a", hasChildren)
								if ref > 0 {
									client.VariablesRequest(ref)
									aas0aas0 := client.ExpectVariablesResponse(t)
									checkChildren(t, aas0aas, "aas[0].aas[0]", 1)
									checkVarRegex(t, aas0aas0, 0, "aas", `aas\[0\]\.aas\[0\]\.aas`, `\[\]main\.a len: 1, cap: 1, \[\(\*main\.a\)\(0x[0-9a-f]+\)\]`, `\[\]main\.a`, hasChildren)
								}
							}
						}
					}

					// Fully missing map auto-loaded when hitting LoadConfig.MaxVariableRecurse (also tests evaluateName corner case)
					ref = checkVarExact(t, locals, -1, "tm", "tm", "main.truncatedMap {v: []map[string]main.astruct len: 1, cap: 1, [[...]]}", "main.truncatedMap", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						tm := client.ExpectVariablesResponse(t)
						checkChildren(t, tm, "tm", 1)
						ref = checkVarExact(t, tm, 0, "v", "tm.v", "[]map[string]main.astruct len: 1, cap: 1, [[...]]", "[]map[string]main.astruct", hasChildren)
						if ref > 0 {
							// Auto-loading of fully missing map children happens here, but they get truncated at MaxArrayValues
							client.VariablesRequest(ref)
							tmV := client.ExpectVariablesResponse(t)
							checkChildren(t, tmV, "tm.v", 1)
							ref = checkVarRegex(t, tmV, 0, `\[0\]`, `tm\.v\[0\]`, `map\[string\]main\.astruct \[.+\.\.\.`, `map\[string\]main\.astruct`, hasChildren)
							if ref > 0 {
								client.VariablesRequest(ref)
								tmV0 := client.ExpectVariablesResponse(t)
								checkChildren(t, tmV0, "tm.v[0]", 34)
							}
						}
					}

					// Auto-loading works with call return variables as well
					protest.MustSupportFunctionCalls(t, testBackend)
					client.EvaluateRequest("call rettm()", 1000, "repl")
					got := client.ExpectEvaluateResponse(t)
					ref = checkEval(t, got, "main.truncatedMap {v: []map[string]main.astruct len: 1, cap: 1, [[...]]}", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						rv := client.ExpectVariablesResponse(t)
						checkChildren(t, rv, "rv", 1)
						ref = checkVarExact(t, rv, 0, "~r0", "", "main.truncatedMap {v: []map[string]main.astruct len: 1, cap: 1, [[...]]}", "main.truncatedMap", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							tm := client.ExpectVariablesResponse(t)
							checkChildren(t, tm, "tm", 1)
							ref = checkVarExact(t, tm, 0, "v", "", "[]map[string]main.astruct len: 1, cap: 1, [[...]]", "[]map[string]main.astruct", hasChildren)
							if ref > 0 {
								// Auto-loading of fully missing map children happens here, but they get truncated at MaxArrayValues
								client.VariablesRequest(ref)
								tmV := client.ExpectVariablesResponse(t)
								checkChildren(t, tmV, "tm.v", 1)
								// TODO(polina): this evaluate name is not usable - it should be empty
								ref = checkVarRegex(t, tmV, 0, `\[0\]`, `\[0\]`, `map\[string\]main\.astruct \[.+\.\.\.`, `map\[string\]main\.astruct`, hasChildren)
								if ref > 0 {
									client.VariablesRequest(ref)
									tmV0 := client.ExpectVariablesResponse(t)
									checkChildren(t, tmV0, "tm.v[0]", 34)
								}
							}
						}
					}

					// TODO(polina): need fully missing array/slice test case

					// Zero slices, structs and maps are not treated as fully missing
					// See zsvar, zsslice,, emptyslice, emptymap, a0
				},
				disconnect: true,
			}})
	})
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					DefaultLoadConfig.FollowPointers = false
					defer func() { DefaultLoadConfig.FollowPointers = true }()

					client.StackTraceRequest(1, 0, 0)
					client.ExpectStackTraceResponse(t)

					loadvars := func(frame int) {
						client.ScopesRequest(frame)
						scopes := client.ExpectScopesResponse(t)
						localsRef := 0
						for _, s := range scopes.Body.Scopes {
							if s.Name == "Locals" {
								localsRef = s.VariablesReference
							}
						}

						client.VariablesRequest(localsRef)
						locals := client.ExpectVariablesResponse(t)

						// Interface auto-loaded when hitting LoadConfig.MaxVariableRecurse=1

						ref := checkVarRegex(t, locals, -1, "ni", "ni", `\[\]interface {} len: 1, cap: 1, \[\[\]interface {} len: 1, cap: 1, \[\*\(\*interface {}\)\(0x[0-9a-f]+\)\]\]`, `\[\]interface {}`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							ni := client.ExpectVariablesResponse(t)
							ref = checkVarRegex(t, ni, 0, `\[0\]`, `ni\[0\]`, `interface \{\}\(\[\]interface \{\}\) \[\*\(\*interface \{\}\)\(0x[0-9a-f]+\)\]`, "interface {}", hasChildren)
							if ref > 0 {
								client.VariablesRequest(ref)
								niI1 := client.ExpectVariablesResponse(t)
								ref = checkVarRegex(t, niI1, 0, "data", `ni\[0\]\.\(data\)`, `\[\]interface {} len: 1, cap: 1, \[\*\(\*interface {}\)\(0x[0-9a-f]+\)`, `\[\]interface {}`, hasChildren)
								if ref > 0 {
									// Auto-loading happens here
									client.VariablesRequest(ref)
									niI1Data := client.ExpectVariablesResponse(t)
									ref = checkVarExact(t, niI1Data, 0, "[0]", "ni[0].(data)[0]", "interface {}(int) 123", "interface {}(int)", hasChildren)
									if ref > 0 {
										client.VariablesRequest(ref)
										niI1DataI2 := client.ExpectVariablesResponse(t)
										checkVarExact(t, niI1DataI2, 0, "data", "ni[0].(data)[0].(data)", "123", "int", noChildren)
									}
								}
							}
						}

						// Pointer values loaded even with LoadConfig.FollowPointers=false
						checkVarExact(t, locals, -1, "a7", "a7", "*main.FooBar {Baz: 5, Bur: \"strum\"}", "*main.FooBar", hasChildren)

						// Auto-loading works on results of evaluate expressions as well
						client.EvaluateRequest("a7", frame, "repl")
						checkEval(t, client.ExpectEvaluateResponse(t), "*main.FooBar {Baz: 5, Bur: \"strum\"}", hasChildren)

						client.EvaluateRequest("&a7", frame, "repl")
						pa7 := client.ExpectEvaluateResponse(t)
						ref = checkEvalRegex(t, pa7, `\*\(\*main\.FooBar\)\(0x[0-9a-f]+\)`, hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							a7 := client.ExpectVariablesResponse(t)
							checkVarExact(t, a7, 0, "a7", "(*(&a7))", "*main.FooBar {Baz: 5, Bur: \"strum\"}", "*main.FooBar", hasChildren)
						}
					}

					// Frame-independent loading expressions allow us to auto-load
					// variables in any frame, not just topmost.
					loadvars(1000 /*first topmost frame*/)
					// step into another function
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{{Name: "main.barfoo"}})
					client.ExpectSetFunctionBreakpointsResponse(t)
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.barfoo", -1)
					loadvars(1001 /*second frame here is same as topmost above*/)
				},
				disconnect: true,
			}})
	})
}

// TestVariablesMetadata exposes test cases where variables contain metadata that
// can be accessed by requesting named variables.
func TestVariablesMetadata(t *testing.T) {
	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute:    func() {},
				disconnect: false,
			}, {
				execute: func() {
					checkStop(t, client, 1, "main.main", -1)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					checkNamedChildren := func(ref int, name, typeStr string, vals []string, evaluate bool) {
						// byteslice, request named variables
						client.NamedVariablesRequest(ref)
						named := client.ExpectVariablesResponse(t)
						checkChildren(t, named, name, 1)
						checkVarExact(t, named, 0, "string()", "", "\"tèst\"", "string", false)

						client.VariablesRequest(ref)
						all := client.ExpectVariablesResponse(t)
						checkChildren(t, all, name, len(vals)+1)
						checkVarExact(t, all, 0, "string()", "", "\"tèst\"", "string", false)
						for i, v := range vals {
							idx := fmt.Sprintf("[%d]", i)
							evalName := fmt.Sprintf("%s[%d]", name, i)
							if evaluate {
								evalName = fmt.Sprintf("(%s)[%d]", name, i)
							}
							checkVarExact(t, all, i+1, idx, evalName, v, typeStr, false)
						}
					}

					bytes := []string{"116 = 0x74", "195 = 0xc3", "168 = 0xa8", "115 = 0x73", "116 = 0x74"}
					runes := []string{"116", "232", "115", "116"}

					// byteslice
					ref := checkVarExactIndexed(t, locals, -1, "byteslice", "byteslice", "[]uint8 len: 5, cap: 5, [116,195,168,115,116]", "[]uint8", true, 5, 1)
					checkNamedChildren(ref, "byteslice", "uint8", bytes, false)

					client.EvaluateRequest("byteslice", 0, "")
					got := client.ExpectEvaluateResponse(t)
					ref = checkEvalIndexed(t, got, "[]uint8 len: 5, cap: 5, [116,195,168,115,116]", hasChildren, 5, 1)
					checkNamedChildren(ref, "byteslice", "uint8", bytes, true)

					// runeslice
					ref = checkVarExactIndexed(t, locals, -1, "runeslice", "runeslice", "[]int32 len: 4, cap: 4, [116,232,115,116]", "[]int32", true, 4, 1)
					checkNamedChildren(ref, "runeslice", "int32", runes, false)

					client.EvaluateRequest("runeslice", 0, "repl")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalIndexed(t, got, "[]int32 len: 4, cap: 4, [116,232,115,116]", hasChildren, 4, 1)
					checkNamedChildren(ref, "runeslice", "int32", runes, true)

					// bytearray
					ref = checkVarExactIndexed(t, locals, -1, "bytearray", "bytearray", "[5]uint8 [116,195,168,115,116]", "[5]uint8", true, 5, 1)
					checkNamedChildren(ref, "bytearray", "uint8", bytes, false)

					client.EvaluateRequest("bytearray", 0, "hover")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalIndexed(t, got, "[5]uint8 [116,195,168,115,116]", hasChildren, 5, 1)
					checkNamedChildren(ref, "bytearray", "uint8", bytes, true)

					// runearray
					ref = checkVarExactIndexed(t, locals, -1, "runearray", "runearray", "[4]int32 [116,232,115,116]", "[4]int32", true, 4, 1)
					checkNamedChildren(ref, "runearray", "int32", runes, false)

					client.EvaluateRequest("runearray", 0, "watch")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalIndexed(t, got, "[4]int32 [116,232,115,116]", hasChildren, 4, 1)
					checkNamedChildren(ref, "runearray", "int32", runes, true)

					// string feature is not available with user-defined byte types
					ref = checkVarExactIndexed(t, locals, -1, "bytestypeslice", "bytestypeslice", "[]main.Byte len: 5, cap: 5, [116,195,168,115,116]", "[]main.Byte", true, 5, 1)
					client.NamedVariablesRequest(ref)
					namedchildren := client.ExpectVariablesResponse(t)
					checkChildren(t, namedchildren, "bytestypeslice as string", 0)
					ref = checkVarExactIndexed(t, locals, -1, "bytetypearray", "bytetypearray", "[5]main.Byte [116,195,168,115,116]", "[5]main.Byte", true, 5, 1)
					client.NamedVariablesRequest(ref)
					namedchildren = client.ExpectVariablesResponse(t)
					checkChildren(t, namedchildren, "bytetypearray as string", 0)
				},
				disconnect: true,
			}})
	})
}

// TestGlobalScopeAndVariables launches the program with showGlobalVariables
// arg set, executes to a breakpoint in the main package and tests that global
// package main variables got loaded. It then steps into a function
// in another package and tests that globals scope got updated to those vars.
func TestGlobalScopeAndVariables(t *testing.T) {
	runTest(t, "consts", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true, "showRegisters": true,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at line 36
				execute: func() {
					if runtime.GOARCH == "386" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 18) && !goversion.VersionAfterOrEqual(runtime.Version(), 1, 21) {
						client.StepInRequest(1)
						client.ExpectStepInResponse(t)
						client.ExpectStoppedEvent(t)
					}
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", 36, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)
					checkScope(t, scopes, 2, "Registers", globalsScope+1)

					client.VariablesRequest(globalsScope)
					client.ExpectVariablesResponse(t)
					// The program has no user-defined globals.
					// Depending on the Go version, there might
					// be some runtime globals (e.g. main..inittask)
					// so testing for the total number is too fragile.

					// Step into pkg.AnotherMethod()
					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					client.ExpectStoppedEvent(t)

					client.StackTraceRequest(1, 0, 20)
					stack = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "", 13, 1000, 4, 4)

					client.ScopesRequest(1000)
					scopes = client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package github.com/go-delve/delve/_fixtures/internal/dir0/pkg)", globalsScope)

					client.VariablesRequest(globalsScope)
					globals := client.ExpectVariablesResponse(t)
					checkChildren(t, globals, "Globals", 1)
					ref := checkVarExact(t, globals, 0, "SomeVar", "github.com/go-delve/delve/_fixtures/internal/dir0/pkg.SomeVar", "pkg.SomeType {X: 0}", "github.com/go-delve/delve/_fixtures/internal/dir0/pkg.SomeType", hasChildren)

					if ref > 0 {
						client.VariablesRequest(ref)
						somevar := client.ExpectVariablesResponse(t)
						checkChildren(t, somevar, "SomeVar", 1)
						// TODO(polina): unlike main.p, this prefix won't work
						checkVarExact(t, somevar, 0, "X", "github.com/go-delve/delve/_fixtures/internal/dir0/pkg.SomeVar.X", "0", "float64", noChildren)
					}
				},
				disconnect: false,
			}})
	})
}

// TestRegistersScopeAndVariables launches the program with showRegisters
// arg set, executes to a breakpoint in the main package and tests that the registers
// got loaded. It then steps into a function in another package and tests that
// the registers were updated by checking PC.
func TestRegistersScopeAndVariables(t *testing.T) {
	if runtime.GOARCH == "ppc64le" {
		t.Skip("skipped on ppc64le: broken")
	}
	runTest(t, "consts", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showRegisters": true,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at line 36
				execute: func() {
					if runtime.GOARCH == "386" && goversion.VersionAfterOrEqual(runtime.Version(), 1, 18) && !goversion.VersionAfterOrEqual(runtime.Version(), 1, 21) {
						client.StepInRequest(1)
						client.ExpectStepInResponse(t)
						client.ExpectStoppedEvent(t)
					}

					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", 36, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					registersScope := localsScope + 1
					checkScope(t, scopes, 1, "Registers", registersScope)

					// Check that instructionPointer points to the InstructionPointerReference.
					pc, err := getPC(t, client, 1)
					if err != nil {
						t.Error(pc)
					}

					client.VariablesRequest(registersScope)
					vr := client.ExpectVariablesResponse(t)
					if len(vr.Body.Variables) == 0 {
						t.Fatal("no registers returned")
					}
					idx := findPcReg(vr.Body.Variables)
					if idx < 0 {
						t.Fatalf("got %#v, want a reg with instruction pointer", vr.Body.Variables)
					}
					pcReg := vr.Body.Variables[idx]
					gotPc, err := strconv.ParseUint(pcReg.Value, 0, 64)
					if err != nil {
						t.Error(err)
					}
					name := strings.TrimSpace(pcReg.Name)
					if gotPc != pc || pcReg.EvaluateName != fmt.Sprintf("_%s", strings.ToUpper(name)) {
						t.Errorf("got %#v,\nwant Name=%s Value=%#x EvaluateName=%q", pcReg, name, pc, fmt.Sprintf("_%s", strings.ToUpper(name)))
					}

					// The program has no user-defined globals.
					// Depending on the Go version, there might
					// be some runtime globals (e.g. main..inittask)
					// so testing for the total number is too fragile.

					// Step into pkg.AnotherMethod()
					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					client.ExpectStoppedEvent(t)

					client.StackTraceRequest(1, 0, 20)
					stack = client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "", 13, 1000, 4, 4)

					client.ScopesRequest(1000)
					scopes = client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Registers", registersScope)

					// Check that rip points to the InstructionPointerReference.
					pc, err = getPC(t, client, 1)
					if err != nil {
						t.Error(pc)
					}
					client.VariablesRequest(registersScope)
					vr = client.ExpectVariablesResponse(t)
					if len(vr.Body.Variables) == 0 {
						t.Fatal("no registers returned")
					}

					idx = findPcReg(vr.Body.Variables)
					if idx < 0 {
						t.Fatalf("got %#v, want a reg with instruction pointer", vr.Body.Variables)
					}
					pcReg = vr.Body.Variables[idx]
					gotPc, err = strconv.ParseUint(pcReg.Value, 0, 64)
					if err != nil {
						t.Error(err)
					}

					if gotPc != pc || pcReg.EvaluateName != fmt.Sprintf("_%s", strings.ToUpper(name)) {
						t.Errorf("got %#v,\nwant Name=%s Value=%#x EvaluateName=%q", pcReg, name, pc, fmt.Sprintf("_%s", strings.ToUpper(name)))
					}
				},
				disconnect: false,
			}})
	})
}

func findPcReg(regs []dap.Variable) int {
	for i, reg := range regs {
		if isPcReg(reg) {
			return i
		}
	}
	return -1
}

func isPcReg(reg dap.Variable) bool {
	pcRegNames := []string{"rip", "pc", "eip", "era"}
	for _, name := range pcRegNames {
		if name == strings.TrimSpace(reg.Name) {
			return true
		}
	}
	return false
}

// TestShadowedVariables executes to a breakpoint and checks the shadowed
// variable is named correctly.
func TestShadowedVariables(t *testing.T) {
	runTest(t, "testshadow", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			// Breakpoints are set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				// Stop at line 13
				execute: func() {
					client.StackTraceRequest(1, 0, 20)
					stack := client.ExpectStackTraceResponse(t)
					checkStackFramesExact(t, stack, "main.main", 13, 1000, 3, 3)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					checkScope(t, scopes, 0, "Locals", localsScope)
					checkScope(t, scopes, 1, "Globals (package main)", globalsScope)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					checkVarExact(t, locals, 0, "(a)", "a", "0", "int", !hasChildren)
					checkVarExact(t, locals, 1, "a", "a", "1", "int", !hasChildren)

					// Check that the non-shadowed of "a" is returned from evaluate request.
					validateEvaluateName(t, client, locals, 1)
				},
				disconnect: false,
			}})
	})
}

// Tests that 'stackTraceDepth' from LaunchRequest is parsed and passed to
// stacktrace requests handlers.
func TestLaunchRequestWithStackTraceDepth(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		var stResp *dap.StackTraceResponse
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "stackTraceDepth": 1,
				})
			},
			// Set breakpoints
			fixture.Source, []int{8},
			[]onBreakpoint{{ // Stop at line 8
				execute: func() {
					client.StackTraceRequest(1, 0, 0)
					stResp = client.ExpectStackTraceResponse(t)
					checkStackFramesHasMore(t, stResp, "main.Increment", 8, 1000, 1 /*returned*/, 2 /*available*/)
				},
				disconnect: false,
			}})
	})
}

type Breakpoint struct {
	line      int
	path      string
	verified  bool
	msgPrefix string
}

func expectSetBreakpointsResponse(t *testing.T, client *daptest.Client, bps []Breakpoint) {
	t.Helper()
	checkSetBreakpointsResponse(t, bps, client.ExpectSetBreakpointsResponse(t))
}

func checkSetBreakpointsResponse(t *testing.T, bps []Breakpoint, got *dap.SetBreakpointsResponse) {
	t.Helper()
	checkBreakpoints(t, bps, got.Body.Breakpoints)
}

func checkBreakpoints(t *testing.T, bps []Breakpoint, breakpoints []dap.Breakpoint) {
	t.Helper()
	if len(breakpoints) != len(bps) {
		t.Errorf("got %#v,\nwant len(Breakpoints)=%d", breakpoints, len(bps))
		return
	}
	for i, bp := range breakpoints {
		if bps[i].line < 0 && !bps[i].verified {
			if bp.Verified != bps[i].verified || !stringContainsCaseInsensitive(bp.Message, bps[i].msgPrefix) {
				t.Errorf("got breakpoints[%d] = %#v, \nwant %#v", i, bp, bps[i])
			}
			continue
		}
		if bp.Line != bps[i].line || bp.Verified != bps[i].verified || bp.Source.Path != bps[i].path ||
			!strings.HasPrefix(bp.Message, bps[i].msgPrefix) {
			t.Errorf("got breakpoints[%d] = %#v, \nwant %#v", i, bp, bps[i])
		}
	}
}

// TestSetBreakpoint executes to a breakpoint and tests different
// configurations of setBreakpoint requests.
func TestSetBreakpoint(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 16)

					// Set two breakpoints at the next two lines in main
					client.SetBreakpointsRequest(fixture.Source, []int{17, 18})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{17, fixture.Source, true, ""}, {18, fixture.Source, true, ""}})

					// Clear 17, reset 18
					client.SetBreakpointsRequest(fixture.Source, []int{18})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{18, fixture.Source, true, ""}})

					// Skip 17, continue to 18
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.main", 18)

					// Set another breakpoint inside the loop in loop(), twice to trigger error
					client.SetBreakpointsRequest(fixture.Source, []int{8, 8})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}, {-1, "", false, "breakpoint already exists"}})

					// Continue into the loop
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "0", "int", noChildren) // i == 0

					// Edit the breakpoint to add a condition
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{8}, map[int]string{8: "i == 3"}, nil, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}})

					// Continue until condition is hit
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)
					client.VariablesRequest(localsScope)
					locals = client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "3", "int", noChildren) // i == 3

					// Edit the breakpoint to remove a condition
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{8}, map[int]string{8: ""}, nil, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}})

					// Continue for one more loop iteration
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)
					client.VariablesRequest(localsScope)
					locals = client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "4", "int", noChildren) // i == 4

					// Set at a line without a statement
					client.SetBreakpointsRequest(fixture.Source, []int{1000})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{-1, "", false, "could not find statement"}}) // all cleared, none set
				},
				// The program has an infinite loop, so we must kill it by disconnecting.
				disconnect: true,
			}})
	})
}

// TestSetInstructionBreakpoint executes to a breakpoint and tests different
// configurations of setInstructionBreakpoint requests.
func TestSetInstructionBreakpoint(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 16)

					// Set two breakpoints in the loop
					client.SetBreakpointsRequest(fixture.Source, []int{8, 9})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}, {9, fixture.Source, true, ""}})

					// Continue to the two breakpoints and get the instructionPointerReference.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)

					client.StackTraceRequest(1, 0, 1)
					st := client.ExpectStackTraceResponse(t)
					if len(st.Body.StackFrames) < 1 {
						t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
					}
					pc8 := st.Body.StackFrames[0].InstructionPointerReference

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 9)

					client.StackTraceRequest(1, 0, 1)
					st = client.ExpectStackTraceResponse(t)
					if len(st.Body.StackFrames) < 1 {
						t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
					}
					pc9 := st.Body.StackFrames[0].InstructionPointerReference

					// Clear the source breakpoints.
					// TODO(suzmue): there is an existing issue that breakpoints with identical locations
					// from different setBreakpoints, setFunctionBreakpoints, setInstructionBreakpoints
					// requests will prevent subsequent ones from being set.
					client.SetBreakpointsRequest(fixture.Source, []int{})
					expectSetBreakpointsResponse(t, client, []Breakpoint{})

					// Set the breakpoints using the instruction pointer references.
					client.SetInstructionBreakpointsRequest([]dap.InstructionBreakpoint{{InstructionReference: pc8}, {InstructionReference: pc9}})
					bps := client.ExpectSetInstructionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 8, path: fixture.Source, verified: true}, {line: 9, path: fixture.Source, verified: true}}, bps)

					// Continue to the two breakpoints and get the instructionPointerReference.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 9)

					// Remove the breakpoint on line 8 and continue.
					client.SetInstructionBreakpointsRequest([]dap.InstructionBreakpoint{{InstructionReference: pc9}})
					bps = client.ExpectSetInstructionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 9, path: fixture.Source, verified: true}}, bps)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 9)

					// Set two breakpoints and expect an error on the second one.
					client.SetInstructionBreakpointsRequest([]dap.InstructionBreakpoint{{InstructionReference: pc8}, {InstructionReference: pc8}})
					bps = client.ExpectSetInstructionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 8, path: fixture.Source, verified: true}, {line: -1, path: "", verified: false, msgPrefix: "breakpoint already exists"}}, bps)

					// Add a condition
					client.SetInstructionBreakpointsRequest([]dap.InstructionBreakpoint{{InstructionReference: pc8, Condition: "i == 100"}})
					bps = client.ExpectSetInstructionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 8, path: fixture.Source, verified: true}}, bps)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "100", "int", noChildren) // i == 100
				},
				// The program has an infinite loop, so we must kill it by disconnecting.
				disconnect: true,
			}})
	})
}

func TestPauseAtStop(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 16)

					client.SetBreakpointsRequest(fixture.Source, []int{6, 8})
					expectSetBreakpointsResponse(t, client, []Breakpoint{{6, fixture.Source, true, ""}, {8, fixture.Source, true, ""}})

					// Send a pause request while stopped on a cleared breakpoint.
					client.PauseRequest(1)
					client.ExpectPauseResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 6)

					// Send a pause request while stopped on a breakpoint.
					client.PauseRequest(1)
					client.ExpectPauseResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" {
						t.Errorf("got %#v, expected breakpoint", se)
					}
					checkStop(t, client, 1, "main.loop", 8)

					// Send a pause request while stopped after stepping.
					client.NextRequest(1)
					client.ExpectNextResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 9)

					client.PauseRequest(1)
					client.ExpectPauseResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.loop", 8)
				},
				// The program has an infinite loop, so we must kill it by disconnecting.
				disconnect: true,
			}})
	})
}

func checkHitBreakpointIds(t *testing.T, se *dap.StoppedEvent, reason string, id int) {
	if se.Body.ThreadId != 1 || se.Body.Reason != reason || len(se.Body.HitBreakpointIds) != 1 || se.Body.HitBreakpointIds[0] != id {
		t.Errorf("got %#v, want Reason=%q, ThreadId=1, HitBreakpointIds=[]int{%d}", se, reason, id)
	}
}

// TestHitBreakpointIds executes to a breakpoint and tests that
// the breakpoint ids in the stopped event are correct.
func TestHitBreakpointIds(t *testing.T) {
	runTest(t, "locationsprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{30}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 30)

					// Set two source breakpoints and two function breakpoints.
					client.SetBreakpointsRequest(fixture.Source, []int{23, 33})
					sourceBps := client.ExpectSetBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 23, path: fixture.Source, verified: true}, {line: 33, path: fixture.Source, verified: true}}, sourceBps)

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "anotherFunction"},
						{Name: "anotherFunction:1"},
					})
					functionBps := client.ExpectSetFunctionBreakpointsResponse(t).Body.Breakpoints
					checkBreakpoints(t, []Breakpoint{{line: 26, path: fixture.Source, verified: true}, {line: 27, path: fixture.Source, verified: true}}, functionBps)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se := client.ExpectStoppedEvent(t)
					checkHitBreakpointIds(t, se, "breakpoint", sourceBps[1].Id)
					checkStop(t, client, 1, "main.main", 33)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)
					checkHitBreakpointIds(t, se, "breakpoint", sourceBps[0].Id)
					checkStop(t, client, 1, "main.(*SomeType).SomeFunction", 23)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)
					checkHitBreakpointIds(t, se, "function breakpoint", functionBps[0].Id)
					checkStop(t, client, 1, "main.anotherFunction", 26)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)

					checkHitBreakpointIds(t, se, "function breakpoint", functionBps[1].Id)

					checkStop(t, client, 1, "main.anotherFunction", 27)
				},
				disconnect: true,
			}})
	})
}

func stringContainsCaseInsensitive(got, want string) bool {
	return strings.Contains(strings.ToLower(got), strings.ToLower(want))
}

// TestSetFunctionBreakpoints is inspired by service/test.TestClientServer_FindLocations.
func TestSetFunctionBreakpoints(t *testing.T) {
	runTest(t, "locationsprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{30}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 30)

					type Breakpoint struct {
						line       int
						sourceName string
						verified   bool
						errMsg     string
					}
					expectSetFunctionBreakpointsResponse := func(bps []Breakpoint) {
						t.Helper()
						got := client.ExpectSetFunctionBreakpointsResponse(t)
						if len(got.Body.Breakpoints) != len(bps) {
							t.Errorf("got %#v,\nwant len(Breakpoints)=%d", got, len(bps))
							return
						}
						for i, bp := range got.Body.Breakpoints {
							if bps[i].line < 0 && !bps[i].verified {
								if bp.Verified != bps[i].verified || !stringContainsCaseInsensitive(bp.Message, bps[i].errMsg) {
									t.Errorf("got breakpoints[%d] = %#v, \nwant %#v", i, bp, bps[i])
								}
								continue
							}
							// Some function breakpoints may be in packages that have been imported and we do not control, so
							// we do not always want to check breakpoint lines.
							if (bps[i].line >= 0 && bp.Line != bps[i].line) || bp.Verified != bps[i].verified || bp.Source.Name != bps[i].sourceName {
								t.Errorf("got breakpoints[%d] = %#v, \nwant %#v", i, bp, bps[i])
							}
						}
					}

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "anotherFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{26, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.anotherFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{26, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "(*SomeType).String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.SomeType.String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.(*SomeType).String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					// Test line offsets
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.anotherFunction:1"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{27, filepath.Base(fixture.Source), true, ""}})

					// Test function names in imported package.
					// Issue #275
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "io/ioutil.ReadFile"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "ioutil.go", true, ""}})

					// Issue #296
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "/io/ioutil.ReadFile"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "ioutil.go", true, ""}})
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "ioutil.ReadFile"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "ioutil.go", true, ""}})

					// Function Breakpoint name also accepts breakpoints that are specified as file:line.
					// TODO(suzmue): We could return an error, but it probably is not necessary since breakpoints,
					// and function breakpoints come in with different requests.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: fmt.Sprintf("%s:14", fixture.Source)},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: fmt.Sprintf("%s:14", filepath.Base(fixture.Source))},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}})

					// Expect error for ambiguous function name.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "Location \"String\" ambiguous"}})

					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "Location \"main.String\" ambiguous"}})

					// Expect error for function that does not exist.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "fakeFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "location \"fakeFunction\" not found"}})

					// Expect error for negative line number.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "main.anotherFunction:-1"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "line offset negative or not a number"}})

					// Expect error when function name is regex.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: `/^.*String.*$/`},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, "", false, "breakpoint name \"/^.*String.*$/\" could not be parsed as a function"}})

					// Expect error when function name is an offset.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "+1"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, "breakpoint name \"+1\" could not be parsed as a function"}})

					// Expect error when function name is a line number.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "14"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, "breakpoint name \"14\" could not be parsed as a function"}})

					// Expect error when function name is an address.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "*b"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, "breakpoint name \"*b\" could not be parsed as a function"}})

					// Expect error when function name is a relative path.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: fmt.Sprintf(".%s%s:14", string(filepath.Separator), filepath.Base(fixture.Source))},
					})
					// This relative path could also be caught by the parser, so we should not match the error message.
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, ""}})
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: fmt.Sprintf("..%s%s:14", string(filepath.Separator), filepath.Base(fixture.Source))},
					})
					// This relative path could also be caught by the parser, so we should not match the error message.
					expectSetFunctionBreakpointsResponse([]Breakpoint{{-1, filepath.Base(fixture.Source), false, ""}})

					// Test multiple function breakpoints.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.String"}, {Name: "anotherFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}, {26, filepath.Base(fixture.Source), true, ""}})

					// Test multiple breakpoints to the same location.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.String"}, {Name: "(*SomeType).String"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}, {-1, "", false, "breakpoint exists"}})

					// Set two breakpoints at SomeType.String and SomeType.SomeFunction.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.String"}, {Name: "SomeType.SomeFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{14, filepath.Base(fixture.Source), true, ""}, {22, filepath.Base(fixture.Source), true, ""}})

					// Clear SomeType.String, reset SomeType.SomeFunction (SomeType.String is called before SomeType.SomeFunction).
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "SomeType.SomeFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{22, filepath.Base(fixture.Source), true, ""}})

					// Expect the next breakpoint to be at SomeType.SomeFunction.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					if se := client.ExpectStoppedEvent(t); se.Body.Reason != "function breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got %#v, want Reason=\"function breakpoint\", ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.(*SomeType).SomeFunction", 22)

					// Set a breakpoint at the next line in the program.
					client.SetBreakpointsRequest(fixture.Source, []int{23})
					got := client.ExpectSetBreakpointsResponse(t)
					if len(got.Body.Breakpoints) != 1 {
						t.Errorf("got %#v,\nwant len(Breakpoints)=%d", got, 1)
						return
					}
					bp := got.Body.Breakpoints[0]
					if bp.Line != 23 || bp.Verified != true || bp.Source.Path != fixture.Source {
						t.Errorf("got breakpoints[0] = %#v, \nwant Line=23 Verified=true Source.Path=%q", bp, fixture.Source)
					}

					// Set a function breakpoint, this should not clear the breakpoint that was set in the previous setBreakpoints request.
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{
						{Name: "anotherFunction"},
					})
					expectSetFunctionBreakpointsResponse([]Breakpoint{{26, filepath.Base(fixture.Source), true, ""}})

					// Expect the next breakpoint to be at line 23.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					if se := client.ExpectStoppedEvent(t); se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got %#v, want Reason=\"breakpoint\", ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.(*SomeType).SomeFunction", 23)

					// Set a breakpoint, this should not clear the breakpoint that was set in the previous setFunctionBreakpoints request.
					client.SetBreakpointsRequest(fixture.Source, []int{37})
					got = client.ExpectSetBreakpointsResponse(t)
					if len(got.Body.Breakpoints) != 1 {
						t.Errorf("got %#v,\nwant len(Breakpoints)=%d", got, 1)
						return
					}
					bp = got.Body.Breakpoints[0]
					if bp.Line != 37 || bp.Verified != true || bp.Source.Path != fixture.Source {
						t.Errorf("got breakpoints[0] = %#v, \nwant Line=23 Verified=true Source.Path=%q", bp, fixture.Source)
					}

					// Expect the next breakpoint to be at line anotherFunction.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					if se := client.ExpectStoppedEvent(t); se.Body.Reason != "function breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got %#v, want Reason=\"function breakpoint\", ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.anotherFunction", 26)
				},
				disconnect: true,
			}})
	})
}

// TestLogPoints executes to a breakpoint and tests that log points
// send OutputEvents and do not halt program execution.
func TestLogPoints(t *testing.T) {
	runTest(t, "callme", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{23},
			[]onBreakpoint{{
				// Stop at line 23
				execute: func() {
					checkStop(t, client, 1, "main.main", 23)
					bps := []int{6, 25, 27, 16}
					logMessages := map[int]string{6: "{i*2}: in callme!", 16: "in callme2!"}
					client.SetBreakpointsRequestWithArgs(fixture.Source, bps, nil, nil, logMessages)
					client.ExpectSetBreakpointsResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					for i := 0; i < 5; i++ {
						se := client.ExpectStoppedEvent(t)
						if se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
							t.Errorf("got stopped event = %#v, \nwant Reason=\"breakpoint\" ThreadId=1", se)
						}
						checkStop(t, client, 1, "main.main", 25)

						client.ContinueRequest(1)
						client.ExpectContinueResponse(t)
						checkLogMessage(t, client.ExpectOutputEvent(t), 1, fmt.Sprintf("%d: in callme!", i*2), fixture.Source, 6)
					}
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got stopped event = %#v, \nwant Reason=\"breakpoint\" ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 27)

					client.NextRequest(1)
					client.ExpectNextResponse(t)

					checkLogMessage(t, client.ExpectOutputEvent(t), 1, "in callme2!", fixture.Source, 16)

					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "step" || se.Body.ThreadId != 1 {
						t.Errorf("got stopped event = %#v, \nwant Reason=\"step\" ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 28)
				},
				disconnect: true,
			}})
	})
}

// TestLogPointsShowFullValue tests that log points will not truncate the string value.
func TestLogPointsShowFullValue(t *testing.T) {
	runTest(t, "longstrings", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 16)
					bps := []int{19}
					logMessages := map[int]string{19: "{&s4097}"}
					client.SetBreakpointsRequestWithArgs(fixture.Source, bps, nil, nil, logMessages)
					client.ExpectSetBreakpointsResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					checkLogMessage(t, client.ExpectOutputEvent(t), 1, "*\"xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx...+3585 more\"", fixture.Source, 19)

					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
						t.Errorf("got stopped event = %#v, \nwant Reason=\"breakpoint\" ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 22)
				},
				disconnect: true,
			}})
	})
}

func checkLogMessage(t *testing.T, oe *dap.OutputEvent, goid int, text, path string, line int) {
	t.Helper()
	prefix := "> [Go "
	if goid >= 0 {
		prefix += strconv.Itoa(goid) + "]"
	}
	if oe.Body.Category != "stdout" || !strings.HasPrefix(oe.Body.Output, prefix) || !strings.HasSuffix(oe.Body.Output, text+"\n") {
		t.Errorf("got output event = %#v, \nwant Category=\"stdout\" Output=\"%s: %s\\n\"", oe, prefix, text)
	}
	if oe.Body.Line != line || oe.Body.Source == nil || oe.Body.Source.Path != path {
		t.Errorf("got output event = %#v, \nwant Line=%d Source.Path=%s", oe, line, path)
	}
}

// TestHaltPreventsAutoResume tests that a pause request issued while processing
// log messages will result in a real stop.
func TestHaltPreventsAutoResume(t *testing.T) {
	runTest(t, "callme", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch", // Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{23},
			[]onBreakpoint{{
				execute: func() {
					savedResumeOnce := resumeOnceAndCheckStop
					defer func() {
						resumeOnceAndCheckStop = savedResumeOnce
					}()
					checkStop(t, client, 1, "main.main", 23)
					bps := []int{6, 25}
					logMessages := map[int]string{6: "in callme!"}
					client.SetBreakpointsRequestWithArgs(fixture.Source, bps, nil, nil, logMessages)
					client.ExpectSetBreakpointsResponse(t)

					for i := 0; i < 5; i++ {
						// Reset the handler to the default behavior.
						resumeOnceAndCheckStop = savedResumeOnce

						// Expect a pause request while stopped not to interrupt continue.
						client.PauseRequest(1)
						client.ExpectPauseResponse(t)

						client.ContinueRequest(1)
						client.ExpectContinueResponse(t)
						se := client.ExpectStoppedEvent(t)
						if se.Body.Reason != "breakpoint" || se.Body.ThreadId != 1 {
							t.Errorf("got stopped event = %#v, \nwant Reason=\"breakpoint\" ThreadId=1", se)
						}
						checkStop(t, client, 1, "main.main", 25)

						pauseDoneChan := make(chan struct{}, 1)
						outputDoneChan := make(chan struct{}, 1)
						// Send a halt request when trying to resume the program after being
						// interrupted. This should allow the log message to be processed,
						// but keep the process from continuing beyond the line.
						resumeOnceAndCheckStop = func(s *Session, command string, allowNextStateChange *syncflag) (*api.DebuggerState, error) {
							// This should trigger after the log message is sent, but before
							// execution is resumed.
							if command == api.DirectionCongruentContinue {
								go func() {
									<-outputDoneChan
									defer close(pauseDoneChan)
									client.PauseRequest(1)
									client.ExpectPauseResponse(t)
								}()
								// Wait for the pause to be complete.
								<-pauseDoneChan
							}
							return s.resumeOnceAndCheckStop(command, allowNextStateChange)
						}

						client.ContinueRequest(1)
						client.ExpectContinueResponse(t)
						checkLogMessage(t, client.ExpectOutputEvent(t), 1, "in callme!", fixture.Source, 6)
						// Signal that the output event has been received.
						close(outputDoneChan)
						// Wait for the pause to be complete.
						<-pauseDoneChan
						se = client.ExpectStoppedEvent(t)
						if se.Body.Reason != "pause" {
							t.Errorf("got stopped event = %#v, \nwant Reason=\"pause\"", se)
						}
						checkStop(t, client, 1, "main.callme", 6)
					}
				},
				disconnect: true,
			}})
	})
}

// TestConcurrentBreakpointsLogPoints tests that a breakpoint set in the main
// goroutine is hit the correct number of times and log points set in the
// children goroutines produce the correct number of output events.
func TestConcurrentBreakpointsLogPoints(t *testing.T) {
	if runtime.GOOS == "windows" && runtime.GOARCH == "arm64" {
		t.Skip("broken")
	}
	tests := []struct {
		name        string
		fixture     string
		start       int
		breakpoints []int
	}{
		{
			name:        "source breakpoints",
			fixture:     "goroutinestackprog",
			breakpoints: []int{23},
		},
		{
			name:    "hardcoded breakpoint",
			fixture: "goroutinebreak",
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			runTest(t, tt.fixture, func(client *daptest.Client, fixture protest.Fixture) {
				client.InitializeRequest()
				client.ExpectInitializeResponseAndCapabilities(t)

				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
				client.ExpectProcessEvent(t)
				client.ExpectInitializedEvent(t)
				client.ExpectLaunchResponse(t)

				bps := append([]int{8}, tt.breakpoints...)
				logMessages := map[int]string{8: "hello"}
				client.SetBreakpointsRequestWithArgs(fixture.Source, bps, nil, nil, logMessages)
				client.ExpectSetBreakpointsResponse(t)

				client.ConfigurationDoneRequest()
				client.ExpectConfigurationDoneResponse(t)

				// There may be up to 1 breakpoint and any number of log points that are
				// hit concurrently. We should get a stopped event every time the breakpoint
				// is hit and an output event for each log point hit.
				var oeCount, seCount int
				for oeCount < 10 || seCount < 10 {
					switch m := client.ExpectMessage(t).(type) {
					case *dap.StoppedEvent:
						if m.Body.Reason != "breakpoint" || !m.Body.AllThreadsStopped || m.Body.ThreadId != 1 {
							t.Errorf("\ngot  %#v\nwant Reason='breakpoint' AllThreadsStopped=true ThreadId=1", m)
						}
						seCount++
						client.ContinueRequest(1)
					case *dap.OutputEvent:
						checkLogMessage(t, m, -1, "hello", fixture.Source, 8)
						oeCount++
					case *dap.ContinueResponse:
					case *dap.TerminatedEvent:
						t.Fatalf("\nexpected 10 output events and 10 stopped events, got %d output events and %d stopped events", oeCount, seCount)
					default:
						t.Fatalf("Unexpected message type: expect StoppedEvent, OutputEvent, or ContinueResponse, got %#v", m)
					}
				}
				// TODO(suzmue): The dap server may identify some false
				// positives for hard coded breakpoints, so there may still
				// be more stopped events.
				client.DisconnectRequestWithKillOption(true)
			})
		})
	}
}

func TestSetBreakpointWhileRunning(t *testing.T) {
	runTest(t, "integrationprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16},
			[]onBreakpoint{{
				execute: func() {
					// The program loops 3 times over lines 14-15-8-9-10-16
					checkStop(t, client, 1, "main.main", 16) // Line that sleeps for 1 second

					// We can set breakpoints while nexting
					client.NextRequest(1)
					client.ExpectNextResponse(t)
					client.SetBreakpointsRequest(fixture.Source, []int{15}) // [16,] => [15,]
					checkSetBreakpointsResponse(t, []Breakpoint{{15, fixture.Source, true, ""}}, client.ExpectSetBreakpointsResponse(t))
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "step" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='step' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 14)
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='breakpoint' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 15)

					// We can set breakpoints while continuing
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.SetBreakpointsRequest(fixture.Source, []int{9}) // [15,] => [9,]
					checkSetBreakpointsResponse(t, []Breakpoint{{9, fixture.Source, true, ""}}, client.ExpectSetBreakpointsResponse(t))
					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='breakpoint' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.sayhi", 9)
				},
				disconnect: true,
			}})
	})
}

func TestSetFunctionBreakpointWhileRunning(t *testing.T) {
	runTest(t, "integrationprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{16},
			[]onBreakpoint{{
				execute: func() {
					// The program loops 3 times over lines 14-15-8-9-10-16
					checkStop(t, client, 1, "main.main", 16) // Line that sleeps for 1 second

					// We can set breakpoints while nexting
					client.NextRequest(1)
					client.ExpectNextResponse(t)
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{{Name: "main.sayhi"}}) // [16,] => [16, 8]
					checkBreakpoints(t, []Breakpoint{{8, fixture.Source, true, ""}}, client.ExpectSetFunctionBreakpointsResponse(t).Body.Breakpoints)
					client.SetBreakpointsRequest(fixture.Source, []int{}) // [16,8] => [8]
					expectSetBreakpointsResponse(t, client, []Breakpoint{})
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "step" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='step' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 14)

					// Make sure we can hit the breakpoints.
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "function breakpoint" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='function breakpoint' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.sayhi", 8)

					// We can set breakpoints while continuing
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.SetFunctionBreakpointsRequest([]dap.FunctionBreakpoint{}) // [8,] => []
					checkBreakpoints(t, []Breakpoint{}, client.ExpectSetFunctionBreakpointsResponse(t).Body.Breakpoints)
					client.SetBreakpointsRequest(fixture.Source, []int{16}) // [] => [16]
					expectSetBreakpointsResponse(t, client, []Breakpoint{{16, fixture.Source, true, ""}})
					se = client.ExpectStoppedEvent(t)
					if se.Body.Reason != "breakpoint" || !se.Body.AllThreadsStopped || se.Body.ThreadId != 1 {
						t.Errorf("\ngot  %#v\nwant Reason='breakpoint' AllThreadsStopped=true ThreadId=1", se)
					}
					checkStop(t, client, 1, "main.main", 16)
				},
				disconnect: true,
			}})
	})
}

func TestHitConditionBreakpoints(t *testing.T) {
	runTest(t, "break", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{4},
			[]onBreakpoint{{
				execute: func() {
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{7}, nil, map[int]string{7: "4"}, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{7, fixture.Source, true, ""}})

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.main", 7)

					// Check that we are stopped at the correct value of i.
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "4", "int", noChildren)

					// Change the hit condition.
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{7}, nil, map[int]string{7: "% 2"}, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{7, fixture.Source, true, ""}})

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.main", 7)

					// Check that we are stopped at the correct value of i.
					client.VariablesRequest(localsScope)
					locals = client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "6", "int", noChildren)

					// Expect an error if an assignment is passed.
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{7}, nil, map[int]string{7: "= 2"}, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{-1, "", false, ""}})

					// Change the hit condition.
					client.SetBreakpointsRequestWithArgs(fixture.Source, []int{7}, nil, map[int]string{7: "< 8"}, nil)
					expectSetBreakpointsResponse(t, client, []Breakpoint{{7, fixture.Source, true, ""}})
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.main", 7)

					// Check that we are stopped at the correct value of i.
					client.VariablesRequest(localsScope)
					locals = client.ExpectVariablesResponse(t)
					checkVarExact(t, locals, 0, "i", "i", "7", "int", noChildren)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					client.ExpectTerminatedEvent(t)
				},
				disconnect: false,
			}})
	})
}

// TestLaunchSubstitutePath sets a breakpoint using a path
// that does not exist and expects the substitutePath attribute
// in the launch configuration to take care of the mapping.
func TestLaunchSubstitutePath(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		substitutePathTestHelper(t, fixture, client, "launch", map[string]interface{}{"mode": "exec", "program": fixture.Path})
	})
}

// TestAttachSubstitutePath sets a breakpoint using a path
// that does not exist and expects the substitutePath attribute
// in the launch configuration to take care of the mapping.
func TestAttachSubstitutePath(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("test skipped on Windows, see https://delve.teamcity.com/project/Delve_windows for details")
	}
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		cmd := execFixture(t, fixture)

		substitutePathTestHelper(t, fixture, client, "attach", map[string]interface{}{"mode": "local", "processId": cmd.Process.Pid})
	})
}

func substitutePathTestHelper(t *testing.T, fixture protest.Fixture, client *daptest.Client, request string, launchAttachConfig map[string]interface{}) {
	t.Helper()
	nonexistentDir := filepath.Join(string(filepath.Separator), "path", "that", "does", "not", "exist")
	if runtime.GOOS == "windows" {
		nonexistentDir = "C:" + nonexistentDir
	}

	launchAttachConfig["stopOnEntry"] = false
	// The rules in 'substitutePath' will be applied as follows:
	// - mapping paths from client to server:
	//		The first rule["from"] to match a prefix of 'path' will be applied:
	//			strings.Replace(path, rule["from"], rule["to"], 1)
	// - mapping paths from server to client:
	//		The first rule["to"] to match a prefix of 'path' will be applied:
	//			strings.Replace(path, rule["to"], rule["from"], 1)
	launchAttachConfig["substitutePath"] = []map[string]string{
		{"from": nonexistentDir, "to": filepath.Dir(fixture.Source)},
		// Since the path mappings are ordered, when converting from client path to
		// server path, this mapping will not apply, because nonexistentDir appears in
		// an earlier rule.
		{"from": nonexistentDir, "to": "this_is_a_bad_path"},
		// Since the path mappings are ordered, when converting from server path to
		// client path, this mapping will not apply, because filepath.Dir(fixture.Source)
		// appears in an earlier rule.
		{"from": "this_is_a_bad_path", "to": filepath.Dir(fixture.Source)},
	}

	runDebugSessionWithBPs(t, client, request,
		func() {
			switch request {
			case "attach":
				client.AttachRequest(launchAttachConfig)
				client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
			case "launch":
				client.LaunchRequestWithArgs(launchAttachConfig)
			default:
				t.Fatalf("invalid request: %s", request)
			}
		},
		// Set breakpoints
		filepath.Join(nonexistentDir, "loopprog.go"), []int{8},
		[]onBreakpoint{{
			execute: func() {
				checkStop(t, client, 1, "main.loop", 8)
			},
			disconnect: true,
		}})
}

// execFixture runs the binary fixture.Path and hooks up stdout and stderr
// to os.Stdout and os.Stderr.
func execFixture(t *testing.T, fixture protest.Fixture) *exec.Cmd {
	t.Helper()
	// TODO(polina): do I need to sanity check testBackend and runtime.GOOS?
	cmd := exec.Command(fixture.Path)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	if err := cmd.Start(); err != nil {
		t.Fatal(err)
	}
	return cmd
}

// TestWorkingDir executes to a breakpoint and tests that the specified
// working directory is the one used to run the program.
func TestWorkingDir(t *testing.T) {
	runTest(t, "workdir", func(client *daptest.Client, fixture protest.Fixture) {
		wd := os.TempDir()
		// For Darwin `os.TempDir()` returns `/tmp` which is symlink to `/private/tmp`.
		if runtime.GOOS == "darwin" {
			wd = "/private/tmp"
		}
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode":        "exec",
					"program":     fixture.Path,
					"stopOnEntry": false,
					"cwd":         wd,
				})
			},
			// Set breakpoints
			fixture.Source, []int{10}, // b main.main
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 10)
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkChildren(t, locals, "Locals", 2)
					for i := range locals.Body.Variables {
						switch locals.Body.Variables[i].Name {
						case "pwd":
							checkVarExact(t, locals, i, "pwd", "pwd", fmt.Sprintf("%q", wd), "string", noChildren)
						case "err":
							checkVarExact(t, locals, i, "err", "err", "error nil", "error", noChildren)
						}
					}
				},
				disconnect: false,
			}})
	})
}

// checkEval is a helper for verifying the values within an EvaluateResponse.
//
//	value - the value of the evaluated expression
//	hasRef - true if the evaluated expression should have children and therefore a non-0 variable reference
//	ref - reference to retrieve children of this evaluated expression (0 if none)
func checkEval(t *testing.T, got *dap.EvaluateResponse, value string, hasRef bool) (ref int) {
	t.Helper()
	if got.Body.Result != value || (got.Body.VariablesReference > 0) != hasRef {
		t.Errorf("\ngot  %#v\nwant Result=%q hasRef=%t", got, value, hasRef)
	}
	return got.Body.VariablesReference
}

// checkEvalIndexed is a helper for verifying the values within an EvaluateResponse.
//
//	value - the value of the evaluated expression
//	hasRef - true if the evaluated expression should have children and therefore a non-0 variable reference
//	ref - reference to retrieve children of this evaluated expression (0 if none)
func checkEvalIndexed(t *testing.T, got *dap.EvaluateResponse, value string, hasRef bool, indexed, named int) (ref int) {
	t.Helper()
	if got.Body.Result != value || (got.Body.VariablesReference > 0) != hasRef || got.Body.IndexedVariables != indexed || got.Body.NamedVariables != named {
		t.Errorf("\ngot  %#v\nwant Result=%q hasRef=%t IndexedVariables=%d NamedVariables=%d", got, value, hasRef, indexed, named)
	}
	return got.Body.VariablesReference
}

func checkEvalRegex(t *testing.T, got *dap.EvaluateResponse, valueRegex string, hasRef bool) (ref int) {
	t.Helper()
	matched, _ := regexp.MatchString(valueRegex, got.Body.Result)
	if !matched || (got.Body.VariablesReference > 0) != hasRef {
		t.Errorf("\ngot  %#v\nwant Result=%q hasRef=%t", got, valueRegex, hasRef)
	}
	return got.Body.VariablesReference
}

func TestEvaluateRequest(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			fixture.Source, []int{}, // Breakpoint set in the program
			[]onBreakpoint{{ // Stop at first breakpoint
				execute: func() {
					checkStop(t, client, 1, "main.foobar", []int{65, 66})

					// Variable lookup
					client.EvaluateRequest("a2", 1000, "this context will be ignored")
					got := client.ExpectEvaluateResponse(t)
					checkEval(t, got, "6", noChildren)

					client.EvaluateRequest("a5", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref := checkEval(t, got, "[]int len: 5, cap: 5, [1,2,3,4,5]", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						a5 := client.ExpectVariablesResponse(t)
						checkChildren(t, a5, "a5", 5)
						checkVarExact(t, a5, 0, "[0]", "(a5)[0]", "1", "int", noChildren)
						checkVarExact(t, a5, 4, "[4]", "(a5)[4]", "5", "int", noChildren)
						validateEvaluateName(t, client, a5, 0)
						validateEvaluateName(t, client, a5, 4)
					}

					// Variable lookup that's not fully loaded
					client.EvaluateRequest("ba", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEvalIndexed(t, got, "[]int len: 200, cap: 200, [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,...+136 more]", hasChildren, 200, 0)

					// All (binary and unary) on basic types except <-, ++ and --
					client.EvaluateRequest("1+1", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "2", noChildren)

					// Comparison operators on any type
					client.EvaluateRequest("1<2", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "true", noChildren)

					// Type casts between numeric types
					client.EvaluateRequest("int(2.3)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "2", noChildren)

					// Type casts of integer constants into any pointer type and vice versa
					client.EvaluateRequest("(*int)(2)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalRegex(t, got, `\*\(unreadable .+\)`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						val := client.ExpectVariablesResponse(t)
						checkChildren(t, val, "*(*int)(2)", 1)
						checkVarRegex(t, val, 0, "^$", `\(\*\(\(\*int\)\(2\)\)\)`, `\(unreadable .+\)`, "int", noChildren)
						validateEvaluateName(t, client, val, 0)
					}

					// Type casts between string, []byte and []rune
					client.EvaluateRequest("[]byte(\"ABC€\")", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEvalIndexed(t, got, "[]uint8 len: 6, cap: 6, [65,66,67,226,130,172]", noChildren, 6, 1)

					// Struct member access (i.e. somevar.memberfield)
					client.EvaluateRequest("ms.Nest.Level", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "1", noChildren)

					// Slicing and indexing operators on arrays, slices and strings
					client.EvaluateRequest("a5[4]", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "5", noChildren)

					// Map access
					client.EvaluateRequest("mp[1]", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEval(t, got, "interface {}(int) 42", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						expr := client.ExpectVariablesResponse(t)
						checkChildren(t, expr, "mp[1]", 1)
						checkVarExact(t, expr, 0, "data", "(mp[1]).(data)", "42", "int", noChildren)
						validateEvaluateName(t, client, expr, 0)
					}

					// Pointer dereference
					client.EvaluateRequest("*ms.Nest", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEvalRegex(t, got, `main\.Nest {Level: 1, Nest: \*main.Nest {Level: 2, Nest: \*\(\*main\.Nest\)\(0x[0-9a-f]+\)}}`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						expr := client.ExpectVariablesResponse(t)
						checkChildren(t, expr, "*ms.Nest", 2)
						checkVarExact(t, expr, 0, "Level", "(*ms.Nest).Level", "1", "int", noChildren)
						validateEvaluateName(t, client, expr, 0)
					}

					// Calls to builtin functions: cap, len, complex, imag and real
					client.EvaluateRequest("len(a5)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "5", noChildren)

					// Type assertion on interface variables (i.e. somevar.(concretetype))
					client.EvaluateRequest("mp[1].(int)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "42", noChildren)
				},
				disconnect: false,
			}, { // Stop at second breakpoint
				execute: func() {
					checkStop(t, client, 1, "main.barfoo", 27)

					// Top-most frame
					client.EvaluateRequest("a1", 1000, "this context will be ignored")
					got := client.ExpectEvaluateResponse(t)
					checkEval(t, got, "\"bur\"", noChildren)
					// No frame defaults to top-most frame
					client.EvaluateRequest("a1", 0, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "\"bur\"", noChildren)
					// Next frame
					client.EvaluateRequest("a1", 1001, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "\"foofoofoofoofoofoo\"", noChildren)
					// Next frame
					client.EvaluateRequest("a1", 1002, "any context but watch")
					erres := client.ExpectVisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: could not find symbol value for a1") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
					client.EvaluateRequest("a1", 1002, "watch")
					erres = client.ExpectInvisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: could not find symbol value for a1") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
					client.EvaluateRequest("a1", 1002, "repl")
					erres = client.ExpectInvisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: could not find symbol value for a1") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
					client.EvaluateRequest("a1", 1002, "hover")
					erres = client.ExpectInvisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: could not find symbol value for a1") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
					client.EvaluateRequest("a1", 1002, "clipboard")
					erres = client.ExpectVisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: could not find symbol value for a1") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: could not find symbol value for a1\"", erres)
					}
				},
				disconnect: false,
			}})
	})
}

func formatConfig(depth int, showGlobals, showRegisters bool, goroutineFilters string, showPprofLabels []string, hideSystemGoroutines bool, substitutePath [][2]string) string {
	formatStr := `stackTraceDepth	%d
showGlobalVariables	%v
showRegisters	%v
goroutineFilters	%q
showPprofLabels	%v
hideSystemGoroutines	%v
substitutePath	%v
`
	return fmt.Sprintf(formatStr, depth, showGlobals, showRegisters, goroutineFilters, showPprofLabels, hideSystemGoroutines, substitutePath)
}

func TestEvaluateCommandRequest(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			fixture.Source, []int{}, // Breakpoint set in the program
			[]onBreakpoint{{ // Stop at first breakpoint
				execute: func() {
					checkStop(t, client, 1, "main.foobar", []int{65, 66})

					// Request help.
					const dlvHelp = `The following commands are available:
    dlv help (alias: h) 	 Prints the help message.
    dlv config 	 Changes configuration parameters.
    dlv sources (alias: s) 	 Print list of source files.

Type 'dlv help' followed by a command for full documentation.
`
					client.EvaluateRequest("dlv help", 1000, "repl")
					got := client.ExpectEvaluateResponse(t)
					checkEval(t, got, dlvHelp, noChildren)

					client.EvaluateRequest("dlv help config", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, msgConfig, noChildren)

					// Test config.
					client.EvaluateRequest("dlv config", 1000, "repl")
					client.ExpectErrorResponse(t)

					client.EvaluateRequest("dlv config -list", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, formatConfig(50, false, false, "", []string{}, false, [][2]string{}), noChildren)

					// Read and modify showGlobalVariables.
					client.EvaluateRequest("dlv config -list showGlobalVariables", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "showGlobalVariables\tfalse\n", noChildren)

					client.ScopesRequest(1000)
					scopes := client.ExpectScopesResponse(t)
					if len(scopes.Body.Scopes) > 1 {
						t.Errorf("\ngot  %#v\nwant len(scopes)=1 (Locals)", scopes)
					}
					checkScope(t, scopes, 0, "Locals", -1)

					client.EvaluateRequest("dlv config showGlobalVariables true", 1000, "repl")
					client.ExpectInvalidatedEvent(t)
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "showGlobalVariables\ttrue\n\nUpdated", noChildren)

					client.EvaluateRequest("dlv config -list", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, formatConfig(50, true, false, "", []string{}, false, [][2]string{}), noChildren)

					client.ScopesRequest(1000)
					scopes = client.ExpectScopesResponse(t)
					if len(scopes.Body.Scopes) < 2 {
						t.Errorf("\ngot  %#v\nwant len(scopes)=2 (Locals & Globals)", scopes)
					}
					checkScope(t, scopes, 0, "Locals", -1)
					checkScope(t, scopes, 1, "Globals (package main)", -1)

					// Read and modify substitutePath.
					client.EvaluateRequest("dlv config -list substitutePath", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "substitutePath\t[]\n", noChildren)

					client.EvaluateRequest(fmt.Sprintf("dlv config substitutePath %q %q", "my/client/path", "your/server/path"), 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "substitutePath\t[[my/client/path your/server/path]]\n\nUpdated", noChildren)

					client.EvaluateRequest(fmt.Sprintf("dlv config substitutePath %q %q", "my/client/path", "new/your/server/path"), 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "substitutePath\t[[my/client/path new/your/server/path]]\n\nUpdated", noChildren)

					client.EvaluateRequest(fmt.Sprintf("dlv config substitutePath %q", "my/client/path"), 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "substitutePath\t[]\n\nUpdated", noChildren)

					// Test sources.
					client.EvaluateRequest("dlv sources", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					if !strings.Contains(got.Body.Result, fixture.Source) {
						t.Errorf("\ngot: %#v, want sources contains %s", got, fixture.Source)
					}

					client.EvaluateRequest(fmt.Sprintf("dlv sources .*%s", strings.ReplaceAll(filepath.Base(fixture.Source), ".", "\\.")), 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					if got.Body.Result != fixture.Source {
						t.Errorf("\ngot: %#v, want sources=%q", got, fixture.Source)
					}

					client.EvaluateRequest("dlv sources nonexistentsource", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					if got.Body.Result != "" {
						t.Errorf("\ngot: %#v, want sources=\"\"", got)
					}

					// Test bad inputs.
					client.EvaluateRequest("dlv help bad", 1000, "repl")
					client.ExpectErrorResponse(t)

					client.EvaluateRequest("dlv bad", 1000, "repl")
					client.ExpectErrorResponse(t)
				},
				disconnect: true,
			}})
	})
}

// From testvariables2 fixture
const (
	// As defined in the code
	longstr = `"very long string 0123456789a0123456789b0123456789c0123456789d0123456789e0123456789f0123456789g012345678h90123456789i0123456789j0123456789"`
	// Loaded with MaxStringLen=64
	longstrLoaded64   = `"very long string 0123456789a0123456789b0123456789c0123456789d012...+73 more"`
	longstrLoaded64re = `\"very long string 0123456789a0123456789b0123456789c0123456789d012\.\.\.\+73 more\"`
)

// TestVariableValueTruncation tests that in certain cases
// we truncate the loaded variable values to make display more user-friendly.
func TestVariableValueTruncation(t *testing.T) {
	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoint set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", -1)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					// Compound variable values may be truncated
					m1Full := `map\[string\]main\.astruct \[(\"[A-Za-z]+\": {A: [0-9]+, B: [0-9]+}, )+,\.\.\.\+2 more\]`
					m1Part := `map\[string\]main\.astruct \[(\"[A-Za-z]+\": {A: [0-9]+, B: [0-9]+}, )+.+\.\.\.`

					// In variable responses
					checkVarRegex(t, locals, -1, "m1", "m1", m1Part, `map\[string\]main\.astruct`, hasChildren)

					// In evaluate responses (select contexts only)
					tests := []struct {
						context string
						want    string
					}{
						{"", m1Part},
						{"watch", m1Part},
						{"repl", m1Part},
						{"hover", m1Part},
						{"variables", m1Full}, // used for copy
						{"clipboard", m1Full}, // used for copy
						{"somethingelse", m1Part},
					}
					for _, tc := range tests {
						t.Run(tc.context, func(t *testing.T) {
							client.EvaluateRequest("m1", 0, tc.context)
							checkEvalRegex(t, client.ExpectEvaluateResponse(t), tc.want, hasChildren)
						})
					}

					// Compound map keys may be truncated even further
					// As the keys are always inside of a map container,
					// this applies to variables requests only, not evaluate requests.

					// key - compound, value - scalar (inlined key:value display) => truncate key if too long
					ref := checkVarExact(t, locals, -1, "m5", "m5", "map[main.C]int [{s: "+longstr+"}: 1, ]", "map[main.C]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						// Key format: <truncated>... @<address>
						checkVarRegex(t, client.ExpectVariablesResponse(t), 1, `main\.C {s: "very long string 0123456789.+\.\.\. @ 0x[0-9a-f]+`, `m5\[\(\*\(\*"main\.C"\)\(0x[0-9a-f]+\)\)\]`, "1", `int`, hasChildren)
					}
					// key - scalar, value - scalar (inlined key:value display) => key not truncated
					ref = checkVarExact(t, locals, -1, "m6", "m6", "map[string]int ["+longstr+": 123, ]", "map[string]int", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						checkVarExact(t, client.ExpectVariablesResponse(t), 1, longstr, `m6[`+longstr+`]`, "123", "string: int", noChildren)
					}
					// key - compound, value - compound (array-like display) => key not truncated
					ref = checkVarExact(t, locals, -1, "m7", "m7", "map[main.C]main.C [{s: "+longstr+"}: {s: \"hello\"}, ]", "map[main.C]main.C", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						m7 := client.ExpectVariablesResponse(t)
						checkVarRegex(t, m7, 1, "[key 0]", `\(\*\(\*\"main\.C\"\)\(0x[0-9a-f]+\)\)`, `main\.C {s: `+longstr+`}`, `main\.C`, hasChildren)
					}
				},
				disconnect: true,
			}})
	})
}

// TestVariableLoadingOfLongStrings tests that different string loading limits
// apply that depending on the context.
func TestVariableLoadingOfLongStrings(t *testing.T) {
	protest.MustSupportFunctionCalls(t, testBackend)
	runTest(t, "longstrings", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Breakpoint set within the program
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", -1)

					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)

					// Limits vary for evaluate requests with different contexts
					tests := []struct {
						context string
						limit   int
					}{
						{"", DefaultLoadConfig.MaxStringLen},
						{"watch", DefaultLoadConfig.MaxStringLen},
						{"repl", maxSingleStringLen},
						{"hover", maxSingleStringLen},
						{"variables", maxSingleStringLen},
						{"clipboard", maxSingleStringLen},
						{"somethingelse", DefaultLoadConfig.MaxStringLen},
					}
					for _, tc := range tests {
						t.Run(tc.context, func(t *testing.T) {
							// Long string by itself (limits vary)
							client.EvaluateRequest("s4097", 0, tc.context)
							want := fmt.Sprintf(`"x+\.\.\.\+%d more"`, 4097-tc.limit)
							checkEvalRegex(t, client.ExpectEvaluateResponse(t), want, noChildren)

							// Evaluated container variables return values with minimally loaded
							// strings, which are further truncated for displaying, so we
							// can't test for loading limit except in contexts where an untruncated
							// value is returned.
							client.EvaluateRequest("&s4097", 0, tc.context)
							switch tc.context {
							case "variables", "clipboard":
								want = fmt.Sprintf(`\*"x+\.\.\.\+%d more`, 4097-DefaultLoadConfig.MaxStringLen)
							default:
								want = fmt.Sprintf(`\*"x{%d}\.\.\.`, maxVarValueLen-2)
							}
							checkEvalRegex(t, client.ExpectEvaluateResponse(t), want, hasChildren)
						})
					}

					// Long strings returned from calls are subject to a different limit,
					// same limit regardless of context
					for _, context := range []string{"", "watch", "repl", "variables", "hover", "clipboard", "somethingelse"} {
						t.Run(context, func(t *testing.T) {
							client.EvaluateRequest(`call buildString(4097)`, 1000, context)
							want := fmt.Sprintf(`"x+\.\.\.\+%d more"`, 4097-maxStringLenInCallRetVars)
							got := client.ExpectEvaluateResponse(t)
							checkEvalRegex(t, got, want, hasChildren)
						})
					}

					// Variables requests use the most conservative loading limit
					checkVarRegex(t, locals, -1, "s513", "s513", `"x{512}\.\.\.\+1 more"`, "string", noChildren)
					// Container variables are subject to additional stricter value truncation that drops +more part
					checkVarRegex(t, locals, -1, "nested", "nested", `map\[int\]string \[513: \"x+\.\.\.`, "string", hasChildren)
				},
				disconnect: true,
			}})
	})
}

func TestEvaluateCallRequest(t *testing.T) {
	protest.MustSupportFunctionCalls(t, testBackend)
	runTest(t, "fncall", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			fixture.Source, []string{"main.makeclos:2"},
			[]onBreakpoint{{ // Stop in makeclos()
				execute: func() {
					checkStop(t, client, 1, "main.makeclos", -1)

					// Topmost frame: both types of expressions should work
					client.EvaluateRequest("callstacktrace", 1000, "this context will be ignored")
					client.ExpectEvaluateResponse(t)
					client.EvaluateRequest("call callstacktrace()", 1000, "this context will be ignored")
					client.ExpectEvaluateResponse(t)

					// Next frame: only non-call expressions will work
					client.EvaluateRequest("callstacktrace", 1001, "this context will be ignored")
					client.ExpectEvaluateResponse(t)
					client.EvaluateRequest("call callstacktrace()", 1001, "not watch")
					erres := client.ExpectVisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: call is only supported with topmost stack frame") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: call is only supported with topmost stack frame\"", erres)
					}

					// A call can stop on a breakpoint
					client.EvaluateRequest("call callbreak()", 1000, "not watch")
					s := client.ExpectStoppedEvent(t)
					if s.Body.Reason != "hardcoded breakpoint" {
						t.Errorf("\ngot %#v\nwant Reason=\"hardcoded breakpoint\"", s)
					}
					erres = client.ExpectVisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: call stopped") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: call stopped\"", erres)
					}

					// A call during a call causes an error
					client.EvaluateRequest("call callstacktrace()", 1000, "not watch")
					erres = client.ExpectVisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: cannot call function while another function call is already in progress") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: cannot call function while another function call is already in progress\"", erres)
					}

					// Complete the call and get back to original breakpoint in makeclos()
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.makeclos", -1)

					// Inject a call for the same function that is stopped at breakpoint:
					// it might stop at the exact same breakpoint on the same goroutine,
					// but we should still detect that its an injected call that stopped
					// and not the return to the original point of injection after it
					// completed.
					client.EvaluateRequest("call makeclos(nil)", 1000, "not watch")
					stopped := client.ExpectStoppedEvent(t)
					erres = client.ExpectVisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: call stopped") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: call stopped\"", erres)
					}
					checkStop(t, client, stopped.Body.ThreadId, "main.makeclos", -1)

					// Complete the call and get back to original breakpoint in makeclos()
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.makeclos", -1)
				},
				disconnect: false,
			}, { // Stop at runtime breakpoint
				execute: func() {
					checkStop(t, client, 1, "main.main", -1)

					// No return values
					client.EvaluateRequest("call call0(1, 2)", 1000, "this context will be ignored")
					got := client.ExpectEvaluateResponse(t)
					checkEval(t, got, "", noChildren)
					// One unnamed return value
					client.EvaluateRequest("call call1(one, two)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref := checkEval(t, got, "3", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						rv := client.ExpectVariablesResponse(t)
						checkChildren(t, rv, "rv", 1)
						checkVarExact(t, rv, 0, "~r2", "", "3", "int", noChildren)
					}
					// One named return value
					// Panic doesn't panic, but instead returns the error as a named return variable
					client.EvaluateRequest("call callpanic()", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEval(t, got, `interface {}(string) "callpanic panicked"`, hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						rv := client.ExpectVariablesResponse(t)
						checkChildren(t, rv, "rv", 1)
						ref = checkVarExact(t, rv, 0, "~panic", "", `interface {}(string) "callpanic panicked"`, "interface {}(string)", hasChildren)
						if ref > 0 {
							client.VariablesRequest(ref)
							p := client.ExpectVariablesResponse(t)
							checkChildren(t, p, "~panic", 1)
							checkVarExact(t, p, 0, "data", "", "\"callpanic panicked\"", "string", noChildren)
						}
					}
					// Multiple return values
					client.EvaluateRequest("call call2(one, two)", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					ref = checkEval(t, got, "1, 2", hasChildren)
					if ref > 0 {
						client.VariablesRequest(ref)
						rvs := client.ExpectVariablesResponse(t)
						checkChildren(t, rvs, "rvs", 2)
						checkVarExact(t, rvs, 0, "~r2", "", "1", "int", noChildren)
						checkVarExact(t, rvs, 1, "~r3", "", "2", "int", noChildren)
					}
					// No frame defaults to top-most frame
					client.EvaluateRequest("call call1(one, two)", 0, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "3", hasChildren)
					// Extra spaces don't matter
					client.EvaluateRequest(" call  call1(one, one) ", 0, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "2", hasChildren)
					// Just 'call', even with extra space, is treated as {expression}
					client.EvaluateRequest("call ", 1000, "watch")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "\"this is a variable named `call`\"", noChildren)

					// Call error
					client.EvaluateRequest("call call1(one)", 1000, "watch")
					erres := client.ExpectInvisibleErrorResponse(t)
					if !checkErrorMessageFormat(erres.Body.Error, "Unable to evaluate expression: not enough arguments") {
						t.Errorf("\ngot %#v\nwant Format=\"Unable to evaluate expression: not enough arguments\"", erres)
					}

					// Assignment - expect no error, but no return value.
					client.EvaluateRequest("call one = two", 1000, "this context will be ignored")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "", noChildren)
					// Check one=two was applied.
					client.EvaluateRequest("one", 1000, "repl")
					got = client.ExpectEvaluateResponse(t)
					checkEval(t, got, "2", noChildren)

					// Call can exit.
					client.EvaluateRequest("call callexit()", 1000, "this context will be ignored")
					client.ExpectTerminatedEvent(t)
					if res := client.ExpectVisibleErrorResponse(t); res.Body.Error == nil || !strings.Contains(res.Body.Error.Format, "terminated") {
						t.Errorf("\ngot %#v\nwant Format=.*terminated.*", res)
					}
				},
				terminated: true,
				disconnect: true,
			}})
	})
}

func TestNextAndStep(t *testing.T) {
	runTest(t, "testinline", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{11},
			[]onBreakpoint{{ // Stop at line 11
				execute: func() {
					checkStop(t, client, 1, "main.initialize", 11)

					expectStop := func(fun string, line int) {
						t.Helper()
						se := client.ExpectStoppedEvent(t)
						if se.Body.Reason != "step" || se.Body.ThreadId != 1 || !se.Body.AllThreadsStopped {
							t.Errorf("got %#v, want Reason=\"step\", ThreadId=1, AllThreadsStopped=true", se)
						}
						checkStop(t, client, 1, fun, line)
					}

					client.StepOutRequest(1)
					client.ExpectStepOutResponse(t)
					expectStop("main.main", 18)

					client.NextRequest(1)
					client.ExpectNextResponse(t)
					expectStop("main.main", 19)

					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					expectStop("main.inlineThis", 5)

					client.NextRequest(-1000)
					client.ExpectNextResponse(t)
					if se := client.ExpectStoppedEvent(t); se.Body.Reason != "error" || se.Body.Text != "unknown goroutine -1000" {
						t.Errorf("got %#v, want Reason=\"error\", Text=\"unknown goroutine -1000\"", se)
					}
					checkStop(t, client, 1, "main.inlineThis", 5)
				},
				disconnect: false,
			}})
	})
}

func TestHardCodedBreakpoints(t *testing.T) {
	runTest(t, "consts", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			fixture.Source, []int{28},
			[]onBreakpoint{{ // Stop at line 28
				execute: func() {
					checkStop(t, client, 1, "main.main", 28)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "breakpoint" {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"breakpoint\"", se)
					}
				},
				disconnect: false,
			}})
	})
}

// TestStepInstruction executes to a breakpoint and tests stepping
// a single instruction
func TestStepInstruction(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{32}, // b main.foobar
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.foobar", 32)

					pc, err := getPC(t, client, 1)
					if err != nil {
						t.Fatal(err)
					}

					// The exact instructions may change due to compiler changes,
					// but we want to make sure that all of our instructions are
					// instantiating variables, since these should not include
					// jumps.
					verifyExpectedLocation := func() {
						client.StackTraceRequest(1, 0, 20)
						st := client.ExpectStackTraceResponse(t)
						if len(st.Body.StackFrames) < 1 {
							t.Errorf("\ngot  %#v\nwant len(stackframes) => 1", st)
						} else {
							// There is a hardcoded breakpoint on line 32. All of the
							// steps should be completed before that line.
							if st.Body.StackFrames[0].Line < 32 {
								t.Errorf("\ngot  %#v\nwant Line<32", st)
							}
							if st.Body.StackFrames[0].Name != "main.foobar" {
								t.Errorf("\ngot  %#v\nwant Name=\"main.foobar\"", st)
							}
						}
					}

					// Next instruction.
					client.NextInstructionRequest(1)
					client.ExpectNextResponse(t)
					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "step" {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"step\"", se)
					}
					verifyExpectedLocation()
					nextPC, err := getPC(t, client, 1)
					if err != nil {
						t.Fatal(err)
					}
					if nextPC <= pc {
						t.Errorf("got %#x, expected InstructionPointerReference>%#x", nextPC, pc)
					}

					// StepIn instruction.
					pc = nextPC
					client.StepInInstructionRequest(1)
					client.ExpectStepInResponse(t)
					se = client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "step" {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"step\"", se)
					}
					verifyExpectedLocation()
					nextPC, err = getPC(t, client, 1)
					if err != nil {
						t.Fatal(err)
					}
					if nextPC <= pc {
						t.Errorf("got %#x, expected InstructionPointerReference>%#x", nextPC, pc)
					}

					// StepOut Instruction.
					pc = nextPC
					client.StepOutInstructionRequest(1)
					client.ExpectStepOutResponse(t)
					se = client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "step" {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"step\"", se)
					}
					verifyExpectedLocation()
					nextPC, err = getPC(t, client, 1)
					if err != nil {
						t.Fatal(err)
					}
					if nextPC <= pc {
						t.Errorf("got %#x, expected InstructionPointerReference>%#x", nextPC, pc)
					}
				},
				disconnect: true,
			}})
	})
}

func getPC(t *testing.T, client *daptest.Client, threadId int) (uint64, error) {
	client.StackTraceRequest(threadId, 0, 1)
	st := client.ExpectStackTraceResponse(t)
	if len(st.Body.StackFrames) < 1 {
		t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
	}
	return strconv.ParseUint(st.Body.StackFrames[0].InstructionPointerReference, 0, 64)
}

// TestNextParked tests that we can switched selected goroutine to a parked one
// and perform next operation on it.
func TestNextParked(t *testing.T) {
	runTest(t, "parallel_next", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{15},
			[]onBreakpoint{{ // Stop at line 15
				execute: func() {
					if parkedGoid := testNextParkedHelper(t, client, fixture); parkedGoid >= 0 {
						client.NextRequest(parkedGoid)
						client.ExpectNextResponse(t)

						se := client.ExpectStoppedEvent(t)
						if se.Body.ThreadId != parkedGoid {
							t.Fatalf("Next did not continue on the newly selected goroutine, expected %d got %d", parkedGoid, se.Body.ThreadId)
						}
					}
				},
				// Let the test harness continue to process termination
				// if it hasn't gotten there already.
				disconnect: false,
			}})
	})
}

// Finds a goroutine other than the selected one that is parked inside of main.sayhi and therefore
// still has a line to execute if resumed with next.
func testNextParkedHelper(t *testing.T, client *daptest.Client, fixture protest.Fixture) int {
	t.Helper()
	// Set a breakpoint at main.sayhi
	client.SetBreakpointsRequest(fixture.Source, []int{8})
	client.ExpectSetBreakpointsResponse(t)

	parkedGoid := -1
	for parkedGoid < 0 {
		client.ContinueRequest(1)
		client.ExpectContinueResponse(t)
		event := client.ExpectMessage(t)
		switch event.(type) {
		case *dap.StoppedEvent:
			// ok
		case *dap.TerminatedEvent:
			// This is very unlikely to happen. But in theory if all sayhi
			// goroutines are run serially, there will never be a second parked
			// sayhi goroutine when another breaks and we will keep trying
			// until process termination.
			return -1
		}

		se := event.(*dap.StoppedEvent)

		client.ThreadsRequest()
		threads := client.ExpectThreadsResponse(t)

		// Search for a parked goroutine that we know for sure will have to be
		// resumed before the program can exit. This is a parked goroutine that:
		// 1. is executing main.sayhi
		// 2. hasn't called wg.Done yet
		// 3. is not the currently selected goroutine
		for _, g := range threads.Body.Threads {
			if g.Id == se.Body.ThreadId || g.Id == 0 {
				// Skip selected goroutine and goroutine 0
				continue
			}
			client.StackTraceRequest(g.Id, 0, 5)
			frames := client.ExpectStackTraceResponse(t)
			for _, frame := range frames.Body.StackFrames {
				// line 11 is the line where wg.Done is called
				if frame.Name == "main.sayhi" && frame.Line < 11 {
					parkedGoid = g.Id
					break
				}
			}
			if parkedGoid >= 0 {
				break
			}
		}
	}

	// Clear all breakpoints.
	client.SetBreakpointsRequest(fixture.Source, []int{})
	client.ExpectSetBreakpointsResponse(t)
	return parkedGoid
}

// TestStepOutPreservesGoroutine is inspired by proc_test.TestStepOutPreservesGoroutine
// and checks that StepOut preserves the currently selected goroutine.
func TestStepOutPreservesGoroutine(t *testing.T) {
	// Checks that StepOut preserves the currently selected goroutine.
	rand.Seed(time.Now().Unix())
	runTest(t, "issue2113", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{25},
			[]onBreakpoint{{ // Stop at line 25
				execute: func() {
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					// The program contains runtime.Breakpoint()
					se := client.ExpectStoppedEvent(t)

					client.ThreadsRequest()
					gs := client.ExpectThreadsResponse(t)

					candg := []int{}
					bestg := []int{}
					for _, g := range gs.Body.Threads {
						// We do not need to check the thread that the program
						// is currently stopped on.
						if g.Id == se.Body.ThreadId {
							continue
						}

						client.StackTraceRequest(g.Id, 0, 20)
						frames := client.ExpectStackTraceResponse(t)
						for _, frame := range frames.Body.StackFrames {
							if frame.Name == "main.coroutine" {
								candg = append(candg, g.Id)
								if strings.HasPrefix(frames.Body.StackFrames[0].Name, "runtime.") {
									bestg = append(bestg, g.Id)
								}
								break
							}
						}
					}
					var goroutineId int
					if len(bestg) > 0 {
						goroutineId = bestg[rand.Intn(len(bestg))]
						t.Logf("selected goroutine %d (best)\n", goroutineId)
					} else if len(candg) > 0 {
						goroutineId = candg[rand.Intn(len(candg))]
						t.Logf("selected goroutine %d\n", goroutineId)
					}

					if goroutineId != 0 {
						client.StepOutRequest(goroutineId)
						client.ExpectStepOutResponse(t)
					} else {
						client.ContinueRequest(-1)
						client.ExpectContinueResponse(t)
					}

					switch e := client.ExpectMessage(t).(type) {
					case *dap.StoppedEvent:
						if e.Body.ThreadId != goroutineId {
							t.Fatalf("StepOut did not continue on the selected goroutine, expected %d got %d", goroutineId, e.Body.ThreadId)
						}
					case *dap.TerminatedEvent:
						t.Logf("program terminated")
					default:
						t.Fatalf("Unexpected event type: expect stopped or terminated event, got %#v", e)
					}
				},
				disconnect: false,
			}})
	})
}

func checkStopOnNextWhileNextingError(t *testing.T, client *daptest.Client, threadID int) {
	t.Helper()
	oe := client.ExpectOutputEvent(t)
	if oe.Body.Category != "console" || oe.Body.Output != fmt.Sprintf("invalid command: %s\n", BetterNextWhileNextingError) {
		t.Errorf("\ngot  %#v\nwant Category=\"console\" Output=\"invalid command: %s\\n\"", oe, BetterNextWhileNextingError)
	}
	se := client.ExpectStoppedEvent(t)
	if se.Body.ThreadId != threadID || se.Body.Reason != "exception" || se.Body.Description != "invalid command" || se.Body.Text != BetterNextWhileNextingError {
		t.Errorf("\ngot  %#v\nwant ThreadId=%d Reason=\"exception\" Description=\"invalid command\" Text=\"%s\"", se, threadID, BetterNextWhileNextingError)
	}
	client.ExceptionInfoRequest(1)
	eInfo := client.ExpectExceptionInfoResponse(t)
	if eInfo.Body.ExceptionId != "invalid command" || eInfo.Body.Description != BetterNextWhileNextingError {
		t.Errorf("\ngot  %#v\nwant ExceptionId=\"invalid command\" Text=\"%s\"", eInfo, BetterNextWhileNextingError)
	}
}

func TestBadAccess(t *testing.T) {
	if runtime.GOOS != "darwin" || testBackend != "lldb" {
		t.Skip("not applicable")
	}
	runTest(t, "issue2078", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{4},
			[]onBreakpoint{{ // Stop at line 4
				execute: func() {
					checkStop(t, client, 1, "main.main", 4)

					expectStoppedOnError := func(errorPrefix string) {
						t.Helper()
						se := client.ExpectStoppedEvent(t)
						if se.Body.ThreadId != 1 || se.Body.Reason != "exception" || (se.Body.Description != "runtime error" && se.Body.Description != "panic") || !strings.Contains(se.Body.Text, errorPrefix) {
							t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"exception\" Description=\"runtime error\" Text=\"%s\"", se, errorPrefix)
						}
						client.ExceptionInfoRequest(1)
						eInfo := client.ExpectExceptionInfoResponse(t)
						if (eInfo.Body.ExceptionId != "runtime error" && eInfo.Body.ExceptionId != "panic") || !strings.Contains(eInfo.Body.Description, errorPrefix) {
							t.Errorf("\ngot  %#v\nwant ExceptionId=\"runtime error\" Text=\"%s\"", eInfo, errorPrefix)
						}
					}

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					expectStoppedOnError("invalid memory address or nil pointer dereference")

					client.StackTraceRequest(1, 0, 2)
					st := client.ExpectStackTraceResponse(t)
					if len(st.Body.StackFrames) > 0 && st.Body.StackFrames[0].Name == "runtime.fatalpanic" {
						// this debugserver has --unmask-signals and it works correctly
						return
					}

					client.NextRequest(1)
					client.ExpectNextResponse(t)
					expectStoppedOnError("invalid memory address or nil pointer dereference")

					client.NextRequest(1)
					client.ExpectNextResponse(t)
					checkStopOnNextWhileNextingError(t, client, 1)

					client.StepInRequest(1)
					client.ExpectStepInResponse(t)
					checkStopOnNextWhileNextingError(t, client, 1)

					client.StepOutRequest(1)
					client.ExpectStepOutResponse(t)
					checkStopOnNextWhileNextingError(t, client, 1)
				},
				disconnect: true,
			}})
	})
}

// TestNextWhileNexting is inspired by command_test.TestIssue387 and tests
// that when 'next' is interrupted by a 'breakpoint', calling 'next'
// again will produce an error with a helpful message, and 'continue'
// will resume the program.
func TestNextWhileNexting(t *testing.T) {
	// a breakpoint triggering during a 'next' operation will interrupt 'next''
	// Unlike the test for the terminal package, we cannot be certain
	// of the number of breakpoints we expect to hit, since multiple
	// breakpoints being hit at the same time is not supported in DAP stopped
	// events.
	runTest(t, "issue387", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{15},
			[]onBreakpoint{{ // Stop at line 15
				execute: func() {
					checkStop(t, client, 1, "main.main", 15)

					client.SetBreakpointsRequest(fixture.Source, []int{8})
					client.ExpectSetBreakpointsResponse(t)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					bpSe := client.ExpectStoppedEvent(t)
					threadID := bpSe.Body.ThreadId
					checkStop(t, client, threadID, "main.dostuff", 8)

					for pos := 9; pos < 11; pos++ {
						client.NextRequest(threadID)
						client.ExpectNextResponse(t)

						stepInProgress := true
						for stepInProgress {
							m := client.ExpectStoppedEvent(t)
							switch m.Body.Reason {
							case "step":
								if !m.Body.AllThreadsStopped {
									t.Errorf("got %#v, want Reason=\"step\", AllThreadsStopped=true", m)
								}
								checkStop(t, client, m.Body.ThreadId, "main.dostuff", pos)
								stepInProgress = false
							case "breakpoint":
								if !m.Body.AllThreadsStopped {
									t.Errorf("got %#v, want Reason=\"breakpoint\", AllThreadsStopped=true", m)
								}

								if stepInProgress {
									// We encountered a breakpoint on a different thread. We should have to resume execution
									// using continue.
									oe := client.ExpectOutputEvent(t)
									if oe.Body.Category != "console" || !strings.Contains(oe.Body.Output, "Step interrupted by a breakpoint.") {
										t.Errorf("\ngot  %#v\nwant Category=\"console\" Output=\"Step interrupted by a breakpoint.\"", oe)
									}
									client.NextRequest(m.Body.ThreadId)
									client.ExpectNextResponse(t)
									checkStopOnNextWhileNextingError(t, client, m.Body.ThreadId)
									// Continue since we have not finished the step request.
									client.ContinueRequest(threadID)
									client.ExpectContinueResponse(t)
								} else {
									checkStop(t, client, m.Body.ThreadId, "main.dostuff", 8)
									// Switch to stepping on this thread instead.
									pos = 8
									threadID = m.Body.ThreadId
								}
							default:
								t.Fatalf("got %#v, want StoppedEvent on step or breakpoint", m)
							}
						}
					}
				},
				disconnect: true,
			}})
	})
}

func TestPanicBreakpointOnContinue(t *testing.T) {
	runTest(t, "panic", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{5},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 5)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					text := "\"BOOM!\""
					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "exception" || se.Body.Description != "panic" || se.Body.Text != text {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"exception\" Description=\"panic\" Text=%q", se, text)
					}

					client.ExceptionInfoRequest(1)
					eInfo := client.ExpectExceptionInfoResponse(t)
					if eInfo.Body.ExceptionId != "panic" || eInfo.Body.Description != text {
						t.Errorf("\ngot  %#v\nwant ExceptionId=\"panic\" Description=%q", eInfo, text)
					}

					client.StackTraceRequest(se.Body.ThreadId, 0, 20)
					st := client.ExpectStackTraceResponse(t)
					for i, frame := range st.Body.StackFrames {
						if strings.HasPrefix(frame.Name, "runtime.") {
							if frame.PresentationHint != "subtle" {
								t.Errorf("\ngot Body.StackFrames[%d]=%#v\nwant Source.PresentationHint=\"subtle\"", i, frame)
							}
						} else if frame.Source != nil && frame.Source.PresentationHint != "" {
							t.Errorf("\ngot Body.StackFrames[%d]=%#v\nwant Source.PresentationHint=\"\"", i, frame)
						}
					}
				},
				disconnect: true,
			}})
	})
}

func TestPanicBreakpointOnNext(t *testing.T) {
	if !goversion.VersionAfterOrEqual(runtime.Version(), 1, 14) {
		// In Go 1.13, 'next' will step into the defer in the runtime
		// main function, instead of the next line in the main program.
		t.SkipNow()
	}

	runTest(t, "panic", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{5},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 5)

					client.NextRequest(1)
					client.ExpectNextResponse(t)

					text := "\"BOOM!\""
					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "exception" || se.Body.Description != "panic" || se.Body.Text != text {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"exception\" Description=\"panic\" Text=%q", se, text)
					}

					client.ExceptionInfoRequest(1)
					eInfo := client.ExpectExceptionInfoResponse(t)
					if eInfo.Body.ExceptionId != "panic" || eInfo.Body.Description != text {
						t.Errorf("\ngot  %#v\nwant ExceptionId=\"panic\" Description=%q", eInfo, text)
					}
				},
				disconnect: true,
			}})
	})
}

func TestFatalThrowBreakpoint(t *testing.T) {
	runTest(t, "fatalerror", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{3},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 3)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					var text string
					// This does not work for Go 1.16.
					ver, _ := goversion.Parse(runtime.Version())
					if ver.Major != 1 || ver.Minor != 16 {
						text = "\"go of nil func value\""
					}

					se := client.ExpectStoppedEvent(t)
					if se.Body.ThreadId != 1 || se.Body.Reason != "exception" || se.Body.Description != "fatal error" || se.Body.Text != text {
						t.Errorf("\ngot  %#v\nwant ThreadId=1 Reason=\"exception\" Description=\"fatal error\" Text=%q", se, text)
					}

					// This does not work for Go 1.16.
					errorPrefix := text
					if errorPrefix == "" {
						errorPrefix = "Throw reason unavailable, see https://github.com/golang/go/issues/46425"
					}
					client.ExceptionInfoRequest(1)
					eInfo := client.ExpectExceptionInfoResponse(t)
					if eInfo.Body.ExceptionId != "fatal error" || !strings.HasPrefix(eInfo.Body.Description, errorPrefix) {
						t.Errorf("\ngot  %#v\nwant ExceptionId=\"runtime error\" Text=%s", eInfo, errorPrefix)
					}
				},
				disconnect: true,
			}})
	})
	runTest(t, "testdeadlock", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{3},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 3)

					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)

					// This does not work for Go 1.16 so skip by detecting versions before or after 1.16.
					var text string
					if !goversion.VersionAfterOrEqual(runtime.Version(), 1, 16) || goversion.VersionAfterOrEqual(runtime.Version(), 1, 17) {
						text = "\"all goroutines are asleep - deadlock!\""
					}
					se := client.ExpectStoppedEvent(t)
					if se.Body.Reason != "exception" || se.Body.Description != "fatal error" || se.Body.Text != text {
						t.Errorf("\ngot  %#v\nwant Reason=\"exception\" Description=\"fatal error\" Text=%q", se, text)
					}

					// TODO(suzmue): Get the exception info for the thread and check the description
					// includes "all goroutines are asleep - deadlock!".
					// Stopped events with no selected goroutines need to be supported to test deadlock.
				},
				disconnect: true,
			}})
	})
}

// checkStop covers the standard sequence of requests issued by
// a client at a breakpoint or another non-terminal stop event.
// The details have been tested by other tests,
// so this is just a sanity check.
// Skips line check if line is -1.
func checkStop(t *testing.T, client *daptest.Client, thread int, fname string, line interface{}) {
	t.Helper()
	client.ThreadsRequest()
	client.ExpectThreadsResponse(t)

	client.CheckStopLocation(t, thread, fname, line)

	client.ScopesRequest(1000)
	client.ExpectScopesResponse(t)

	client.VariablesRequest(localsScope)
	client.ExpectVariablesResponse(t)
}

// onBreakpoint specifies what the test harness should simulate at
// a stopped breakpoint. First execute() is to be called to test
// specified editor-driven or user-driven requests. Then if
// disconnect is true, the test harness will abort the program
// execution. Otherwise, a continue will be issued and the
// program will continue to the next breakpoint or termination.
// If terminated is true, we expect requests at this breakpoint
// to result in termination.
type onBreakpoint struct {
	execute    func()
	disconnect bool
	terminated bool
}

// runDebugSessionWithBPs is a helper for executing the common init and shutdown
// sequences for a program that does not stop on entry
// while specifying breakpoints and unique launch/attach criteria via parameters.
//
//	cmd            - "launch" or "attach"
//	cmdRequest     - a function that sends a launch or attach request,
//	                 so the test author has full control of its arguments.
//	                 Note that he rest of the test sequence assumes that
//	                 stopOnEntry is false.
//	 source        - source file path, needed to set breakpoints, "" if none to be set.
//	 breakpoints   - list of lines, where breakpoints are to be set
//	 onBPs         - list of test sequences to execute at each of the set breakpoints.
func runDebugSessionWithBPs(t *testing.T, client *daptest.Client, cmd string, cmdRequest func(), source string, breakpoints interface{}, onBPs []onBreakpoint) {
	client.InitializeRequest()
	client.ExpectInitializeResponseAndCapabilities(t)

	cmdRequest()

	if cmd == "launch" {
		client.ExpectProcessEvent(t)
	}

	client.ExpectInitializedEvent(t)
	switch cmd {
	case "launch":
		client.ExpectLaunchResponse(t)
	case "attach":
		client.ExpectAttachResponse(t)
	default:
		panic("expected launch or attach command")
	}

	if source != "" {
		switch breakpoints := breakpoints.(type) {
		case []int:
			client.SetBreakpointsRequest(source, breakpoints)
			client.ExpectSetBreakpointsResponse(t)
		case []string:
			fbps := []dap.FunctionBreakpoint{}
			for _, bp := range breakpoints {
				fbps = append(fbps, dap.FunctionBreakpoint{Name: bp})
			}
			client.SetFunctionBreakpointsRequest(fbps)
			client.ExpectSetFunctionBreakpointsResponse(t)
		}
	}

	// Skip no-op setExceptionBreakpoints

	client.ConfigurationDoneRequest()
	client.ExpectConfigurationDoneResponse(t)

	// Program automatically continues to breakpoint or completion

	// TODO(polina): See if we can make this more like withTestProcessArgs in proc_test:
	// a single function pointer gets called here and then if it wants to continue it calls
	// client.ContinueRequest/client.ExpectContinueResponse/client.ExpectStoppedEvent
	// (possibly using a helper function).
	for _, onBP := range onBPs {
		client.ExpectStoppedEvent(t)
		onBP.execute()
		if onBP.disconnect {
			client.DisconnectRequestWithKillOption(true)
			if onBP.terminated {
				client.ExpectOutputEventProcessExitedAnyStatus(t)
				client.ExpectOutputEventDetaching(t)
			} else {
				client.ExpectOutputEventDetachingKill(t)
			}
			client.ExpectDisconnectResponse(t)
			client.ExpectTerminatedEvent(t)
			return
		}
		client.ContinueRequest(1)
		client.ExpectContinueResponse(t)
		// "Continue" is triggered after the response is sent
	}

	if cmd == "launch" { // Let the program run to completion
		client.ExpectTerminatedEvent(t)
	}
	client.DisconnectRequestWithKillOption(true)
	if cmd == "launch" {
		client.ExpectOutputEventProcessExitedAnyStatus(t)
		client.ExpectOutputEventDetaching(t)
	} else if cmd == "attach" {
		client.ExpectOutputEventDetachingKill(t)
	}
	client.ExpectDisconnectResponse(t)
	client.ExpectTerminatedEvent(t)
}

// runDebugSession is a helper for executing the standard init and shutdown
// sequences for a program that does not stop on entry
// while specifying unique launch criteria via parameters.
func runDebugSession(t *testing.T, client *daptest.Client, cmd string, cmdRequest func()) {
	runDebugSessionWithBPs(t, client, cmd, cmdRequest, "", nil, nil)
}

func TestLaunchDebugRequest(t *testing.T) {
	rescueStderr := os.Stderr
	r, w, _ := os.Pipe()
	os.Stderr = w
	done := make(chan struct{})

	var err []byte

	go func() {
		err, _ = io.ReadAll(r)
		t.Log(string(err))
		close(done)
	}()

	tmpBin := "__tmpBin"
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// We reuse the harness that builds, but ignore the built binary,
		// only relying on the source to be built in response to LaunchRequest.
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "debug", "program": fixture.Source, "output": tmpBin,
			})
		})
	})
	// Wait for the test to finish to capture all stderr
	time.Sleep(100 * time.Millisecond)

	w.Close()
	<-done
	os.Stderr = rescueStderr

	rmErrRe := regexp.MustCompile(`could not remove .*\n`)
	rmErr := rmErrRe.FindString(string(err))
	if rmErr != "" {
		// On Windows, a file in use cannot be removed, resulting in "Access is denied".
		// When the process exits, Delve releases the binary by calling
		// BinaryInfo.Close(), but it appears that it is still in use (by Windows?)
		// shortly after. gobuild.Remove has a delay to address this, but
		// to avoid any test flakiness we guard against this failure here as well.
		if runtime.GOOS != "windows" || !stringContainsCaseInsensitive(rmErr, "Access is denied") {
			t.Fatalf("Binary removal failure:\n%s\n", rmErr)
		}
	} else {
		tmpBin = cleanExeName(tmpBin)
		// We did not get a removal error, but did we even try to remove before exiting?
		// Confirm that the binary did get removed.
		if _, err := os.Stat(tmpBin); err == nil || os.IsExist(err) {
			t.Fatal("Failed to remove temp binary", tmpBin)
		}
	}
}

// TestLaunchRequestDefaults tests defaults for launch attribute that are explicit in other tests.
func TestLaunchRequestDefaults(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "" /*"debug" by default*/, "program": fixture.Source, "output": "__mybin",
			})
		})
	})
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				/*"mode":"debug" by default*/ "program": fixture.Source, "output": "__mybin",
			})
		})
	})
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			// Use the temporary output binary.
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "debug", "program": fixture.Source,
			})
		})
	})
}

// TestLaunchRequestOutputPath verifies that relative output binary path
// is mapped to server's, not target's, working directory.
func TestLaunchRequestOutputPath(t *testing.T) {
	runTest(t, "testargs", func(client *daptest.Client, fixture protest.Fixture) {
		inrel := "__somebin"
		wd, _ := os.Getwd()
		outabs := cleanExeName(filepath.Join(wd, inrel))
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "debug", "program": fixture.Source, "output": inrel,
					"cwd": filepath.Dir(wd),
				})
			},
			// Set breakpoints
			fixture.Source, []int{12},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 12)
					client.EvaluateRequest("os.Args[0]", 1000, "repl")
					checkEval(t, client.ExpectEvaluateResponse(t), fmt.Sprintf("%q", outabs), noChildren)
				},
				disconnect: true,
			}})
	})
}

func TestExitNonZeroStatus(t *testing.T) {
	runTest(t, "pr1055", func(client *daptest.Client, fixture protest.Fixture) {
		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)

		client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
		client.ExpectProcessEvent(t)
		client.ExpectInitializedEvent(t)
		client.ExpectLaunchResponse(t)

		client.ConfigurationDoneRequest()
		client.ExpectConfigurationDoneResponse(t)

		client.ExpectTerminatedEvent(t)

		client.DisconnectRequest()
		// Check that the process exit status is 2.
		oep := client.ExpectOutputEventProcessExited(t, 2)
		if oep.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Category='console'", oep)
		}
		oed := client.ExpectOutputEventDetaching(t)
		if oed.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Category='console'", oed)
		}
		client.ExpectDisconnectResponse(t)
		client.ExpectTerminatedEvent(t)
	})
}

func TestNoDebug_GoodExitStatus(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runNoDebugSession(t, client, func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"noDebug": true, "mode": "debug", "program": fixture.Source, "output": "__mybin",
			})
		}, 0)
	})
}

func TestNoDebug_BadExitStatus(t *testing.T) {
	runTest(t, "issue1101", func(client *daptest.Client, fixture protest.Fixture) {
		runNoDebugSession(t, client, func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"noDebug": true, "mode": "exec", "program": fixture.Path,
			})
		}, 2)
	})
}

// runNoDebugSession tests the session started with noDebug=true runs
// to completion and logs termination status.
func runNoDebugSession(t *testing.T, client *daptest.Client, launchRequest func(), exitStatus int) {
	client.InitializeRequest()
	client.ExpectInitializeResponseAndCapabilities(t)

	launchRequest()
	// no initialized event.
	// noDebug mode applies only to "launch" requests.
	client.ExpectLaunchResponse(t)

	client.ExpectOutputEventProcessExited(t, exitStatus)
	client.ExpectTerminatedEvent(t)
	client.DisconnectRequestWithKillOption(true)
	client.ExpectDisconnectResponse(t)
	client.ExpectTerminatedEvent(t)
}

func TestNoDebug_AcceptNoRequestsButDisconnect(t *testing.T) {
	runTest(t, "http_server", func(client *daptest.Client, fixture protest.Fixture) {
		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)
		client.LaunchRequestWithArgs(map[string]interface{}{
			"noDebug": true, "mode": "exec", "program": fixture.Path,
		})
		client.ExpectLaunchResponse(t)

		// Anything other than disconnect should get rejected
		ExpectNoDebugError := func(cmd string) {
			er := client.ExpectErrorResponse(t)
			if !checkErrorMessageFormat(er.Body.Error, fmt.Sprintf("noDebug mode: unable to process '%s' request", cmd)) {
				t.Errorf("\ngot %#v\nwant 'noDebug mode: unable to process '%s' request'", er, cmd)
			}
		}
		client.SetBreakpointsRequest(fixture.Source, []int{8})
		ExpectNoDebugError("setBreakpoints")
		client.SetFunctionBreakpointsRequest(nil)
		ExpectNoDebugError("setFunctionBreakpoints")
		client.PauseRequest(1)
		ExpectNoDebugError("pause")
		client.RestartRequest()
		client.ExpectUnsupportedCommandErrorResponse(t)

		// Disconnect request is ok
		client.DisconnectRequestWithKillOption(true)
		terminated, disconnectResp := false, false
		for {
			m, err := client.ReadMessage()
			if err != nil {
				break
			}
			switch m := m.(type) {
			case *dap.OutputEvent:
				ok := false
				wants := []string{`Terminating process [0-9]+\n`, fmt.Sprintf(daptest.ProcessExited, "(-1|1)")}
				for _, want := range wants {
					if matched, _ := regexp.MatchString(want, m.Body.Output); matched {
						ok = true
						break
					}
				}
				if !ok {
					t.Errorf("\ngot %#v\nwant Output=%q\n", m, wants)
				}
			case *dap.TerminatedEvent:
				terminated = true
			case *dap.DisconnectResponse:
				disconnectResp = true
			default:
				t.Errorf("got unexpected message %#v", m)
			}
		}
		if !terminated {
			t.Errorf("did not get TerminatedEvent")
		}
		if !disconnectResp {
			t.Errorf("did not get DisconnectResponse")
		}
	})
}

func TestLaunchRequestWithRelativeBuildPath(t *testing.T) {
	serverStopped := make(chan struct{})
	client := startDAPServerWithClient(t, false, serverStopped)
	defer client.Close()

	fixdir := protest.FindFixturesDir()
	if filepath.IsAbs(fixdir) {
		t.Fatal("this test requires relative program path")
	}
	program := filepath.Join(protest.FindFixturesDir(), "buildtest")

	// Use different working dir for target than dlv.
	// Program path will be interpreted relative to dlv's.
	dlvwd, _ := os.Getwd()
	runDebugSession(t, client, "launch", func() {
		client.LaunchRequestWithArgs(map[string]interface{}{
			"mode": "debug", "program": program, "cwd": filepath.Dir(dlvwd),
		})
	})
	<-serverStopped
}

func TestLaunchRequestWithRelativeExecPath(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		symlink := "./__thisexe"
		err := os.Symlink(fixture.Path, symlink)
		if err != nil {
			if runtime.GOOS == "windows" {
				t.Skip("this test requires symlinks to be enabled and allowed")
			} else {
				t.Fatal("unable to create relative symlink:", err)
			}
		}
		defer os.Remove(symlink)
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "exec", "program": symlink,
			})
		})
	})
}

func TestLaunchTestRequest(t *testing.T) {
	orgWD, _ := os.Getwd()
	fixtures := protest.FindFixturesDir() // relative to current working directory.
	absoluteFixturesDir, _ := filepath.Abs(fixtures)
	absolutePkgDir, _ := filepath.Abs(filepath.Join(fixtures, "buildtest"))
	testFile := filepath.Join(absolutePkgDir, "main_test.go")

	for _, tc := range []struct {
		name       string
		dlvWD      string
		launchArgs map[string]interface{}
		wantWD     string
	}{{
		name: "default",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir,
		},
		wantWD: absolutePkgDir,
	}, {
		name: "output",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "output": "test.out",
		},
		wantWD: absolutePkgDir,
	}, {
		name: "dlvCwd",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "dlvCwd": ".",
		},
		wantWD: absolutePkgDir,
	}, {
		name: "dlvCwd2",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": ".", "dlvCwd": absolutePkgDir,
		},
		wantWD: absolutePkgDir,
	}, {
		name: "cwd",
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "cwd": fixtures, // fixtures is relative to the current working directory.
		},
		wantWD: absoluteFixturesDir,
	}, {
		name:  "dlv runs outside of module",
		dlvWD: os.TempDir(),
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "dlvCwd": absoluteFixturesDir,
		},
		wantWD: absolutePkgDir,
	}, {
		name:  "dlv builds in dlvCwd but runs in cwd",
		dlvWD: fixtures,
		launchArgs: map[string]interface{}{
			"mode": "test", "program": absolutePkgDir, "dlvCwd": absolutePkgDir, "cwd": "..", // relative to dlvCwd.
		},
		wantWD: absoluteFixturesDir,
	}} {
		t.Run(tc.name, func(t *testing.T) {
			// Some test cases with dlvCwd or dlvWD change process working directory.
			defer os.Chdir(orgWD)
			if tc.dlvWD != "" {
				os.Chdir(tc.dlvWD)
				defer os.Chdir(orgWD)
			}
			serverStopped := make(chan struct{})
			client := startDAPServerWithClient(t, false, serverStopped)
			defer client.Close()

			runDebugSessionWithBPs(t, client, "launch",
				func() { // Launch
					client.LaunchRequestWithArgs(tc.launchArgs)
				},
				testFile, []int{14},
				[]onBreakpoint{{
					execute: func() {
						checkStop(t, client, -1, "buildtest.TestCurrentDirectory", 14)
						client.VariablesRequest(1001) // Locals
						locals := client.ExpectVariablesResponse(t)
						checkChildren(t, locals, "Locals", 1)
						for i := range locals.Body.Variables {
							switch locals.Body.Variables[i].Name {
							case "wd": // The test's working directory is the package directory by default.
								checkVarExact(t, locals, i, "wd", "wd", fmt.Sprintf("%q", tc.wantWD), "string", noChildren)
							}
						}
					},
				}})

			<-serverStopped
		})
	}
}

// Tests that 'args' from LaunchRequest are parsed and passed to the target
// program. The target program exits without an error on success, and
// panics on error, causing an unexpected StoppedEvent instead of
// Terminated Event.
func TestLaunchRequestWithArgs(t *testing.T) {
	runTest(t, "testargs", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "exec", "program": fixture.Path,
				"args": []string{"test", "pass flag"},
			})
		})
	})
}

// Tests that 'buildFlags' from LaunchRequest are parsed and passed to the
// compiler. The target program exits without an error on success, and
// panics on error, causing an unexpected StoppedEvent instead of
// TerminatedEvent.
func TestLaunchRequestWithBuildFlags(t *testing.T) {
	runTest(t, "buildflagtest", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			// We reuse the harness that builds, but ignore the built binary,
			// only relying on the source to be built in response to LaunchRequest.
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "debug", "program": fixture.Source, "output": "__mybin",
				"buildFlags": "-ldflags '-X main.Hello=World'",
			})
		})
	})
}

func TestLaunchRequestWithBuildFlags2(t *testing.T) {
	runTest(t, "buildflagtest", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSession(t, client, "launch", func() {
			// We reuse the harness that builds, but ignore the built binary,
			// only relying on the source to be built in response to LaunchRequest.
			client.LaunchRequestWithArgs(map[string]interface{}{
				"mode": "debug", "program": fixture.Source, "output": "__mybin",
				"buildFlags": []string{"-ldflags", "-X main.Hello=World"},
			})
		})
	})
}

func TestLaunchRequestWithEnv(t *testing.T) {
	// testenv fixture will lookup SOMEVAR with
	//   x, y := os.Lookup("SOMEVAR")
	// before stopping at runtime.Breakpoint.

	type envMap map[string]*string
	strVar := func(s string) *string { return &s }

	fixtures := protest.FindFixturesDir() // relative to current working directory.
	testFile, _ := filepath.Abs(filepath.Join(fixtures, "testenv.go"))
	for _, tc := range []struct {
		name      string
		initEnv   envMap
		launchEnv envMap
		wantX     string
		wantY     bool
	}{
		{
			name:    "no env",
			initEnv: envMap{"SOMEVAR": strVar("baz")},
			wantX:   "baz",
			wantY:   true,
		},
		{
			name:      "overwrite",
			initEnv:   envMap{"SOMEVAR": strVar("baz")},
			launchEnv: envMap{"SOMEVAR": strVar("bar")},
			wantX:     "bar",
			wantY:     true,
		},
		{
			name:      "unset",
			initEnv:   envMap{"SOMEVAR": strVar("baz")},
			launchEnv: envMap{"SOMEVAR": nil},
			wantX:     "",
			wantY:     false,
		},
		{
			name:      "empty value",
			initEnv:   envMap{"SOMEVAR": strVar("baz")},
			launchEnv: envMap{"SOMEVAR": strVar("")},
			wantX:     "",
			wantY:     true,
		},
		{
			name:      "set",
			launchEnv: envMap{"SOMEVAR": strVar("foo")},
			wantX:     "foo",
			wantY:     true,
		},
		{
			name:      "untouched",
			initEnv:   envMap{"SOMEVAR": strVar("baz")},
			launchEnv: envMap{"SOMEVAR2": nil, "SOMEVAR3": strVar("foo")},
			wantX:     "baz",
			wantY:     true,
		},
	} {
		t.Run(tc.name, func(t *testing.T) {
			for k, v := range tc.initEnv {
				if v != nil {
					t.Setenv(k, *v)
				}
			}

			serverStopped := make(chan struct{})
			client := startDAPServerWithClient(t, false, serverStopped)
			defer client.Close()

			runDebugSessionWithBPs(t, client, "launch", func() { // launch
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode":    "debug",
					"program": testFile,
					"env":     tc.launchEnv,
				})
			}, testFile, nil, // runtime.Breakpoint
				[]onBreakpoint{{
					execute: func() {
						client.EvaluateRequest("x", 1000, "whatever")
						gotX := client.ExpectEvaluateResponse(t)
						checkEval(t, gotX, fmt.Sprintf("%q", tc.wantX), false)
						client.EvaluateRequest("y", 1000, "whatever")
						gotY := client.ExpectEvaluateResponse(t)
						checkEval(t, gotY, fmt.Sprintf("%v", tc.wantY), false)
					},
					disconnect: true,
				}})
			<-serverStopped
		})
	}
}

func TestAttachRequest(t *testing.T) {
	if runtime.GOOS == "windows" {
		t.Skip("test skipped on Windows, see https://delve.teamcity.com/project/Delve_windows for details")
	}
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		// Start the program to attach to
		cmd := execFixture(t, fixture)

		runDebugSessionWithBPs(t, client, "attach",
			// Attach
			func() {
				client.AttachRequest(map[string]interface{}{
					/*"mode": "local" by default*/ "processId": cmd.Process.Pid, "stopOnEntry": false,
				})
				client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
			},
			// Set breakpoints
			fixture.Source, []int{8},
			[]onBreakpoint{{
				// Stop at line 8
				execute: func() {
					checkStop(t, client, 1, "main.loop", 8)
					client.VariablesRequest(localsScope)
					locals := client.ExpectVariablesResponse(t)
					checkChildren(t, locals, "Locals", 1)
					checkVarRegex(t, locals, 0, "i", "i", "[0-9]+", "int", noChildren)
				},
				disconnect: true,
			}})
	})
}

func TestAttachWaitForRequest(t *testing.T) {
	if runtime.GOOS == "freebsd" {
		// The value of /proc/[pid]/cmdline might be wrong on FreeBSD: zero or the same as the parent process.
		t.Skip("test skipped on freebsd")
	}
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		cmd := exec.Command(fixture.Path)
		stdout, err := cmd.StdoutPipe()
		if err != nil {
			t.Fatal(err)
		}
		cmd.Stderr = os.Stderr
		if err := cmd.Start(); err != nil {
			t.Fatal(err)
		}
		// Wait for output.
		// This will give the target process time to initialize the runtime before we attach,
		// so we can rely on having goroutines when they are requested on attach.
		scanOut := bufio.NewScanner(stdout)
		scanOut.Scan()
		if scanOut.Text() != "past main" {
			t.Errorf("expected loopprog.go to output \"past main\"")
		}

		t.Logf("The process id of program %q is %d", cmd.Path, cmd.Process.Pid)

		client.InitializeRequest()
		client.ExpectInitializeResponseAndCapabilities(t)
		client.AttachRequest(map[string]interface{}{
			"mode":        "local",
			"waitFor":     fixture.Path,
			"stopOnEntry": true,
		})
		client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		client.DisconnectRequestWithKillOption(true)
		client.ExpectOutputEvent(t)
		client.ExpectDisconnectResponse(t)
		client.ExpectTerminatedEvent(t)

		runtime.KeepAlive(stdout)
	})
}

// Since we are in async mode while running, we might receive thee messages after pause request
// in either order.
func expectPauseResponseAndStoppedEvent(t *testing.T, client *daptest.Client) {
	t.Helper()
	for i := 0; i < 2; i++ {
		msg := client.ExpectMessage(t)
		switch m := msg.(type) {
		case *dap.StoppedEvent:
			if m.Body.Reason != "pause" || m.Body.ThreadId != 0 && m.Body.ThreadId != 1 {
				t.Errorf("\ngot %#v\nwant ThreadId=0/1 Reason='pause'", m)
			}
		case *dap.PauseResponse:
		default:
			t.Fatalf("got %#v, want StoppedEvent or PauseResponse", m)
		}
	}
}

func TestPauseAndContinue(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{6},
			[]onBreakpoint{{
				execute: func() {
					client.CheckStopLocation(t, 1, "main.loop", 6)

					// Continue resumes all goroutines, so thread id is ignored
					client.ContinueRequest(12345)
					client.ExpectContinueResponse(t)

					time.Sleep(time.Second)

					// Halt pauses all goroutines, so thread id is ignored
					client.PauseRequest(56789)
					expectPauseResponseAndStoppedEvent(t, client)

					// Pause will be a no-op at a pause: there will be no additional stopped events
					client.PauseRequest(1)
					client.ExpectPauseResponse(t)
				},
				// The program has an infinite loop, so we must kill it by disconnecting.
				disconnect: true,
			}})
	})
}

func TestUnsupportedCommandResponses(t *testing.T) {
	var got *dap.ErrorResponse
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		seqCnt := 1
		expectUnsupportedCommand := func(cmd string) {
			t.Helper()
			got = client.ExpectUnsupportedCommandErrorResponse(t)
			if got.RequestSeq != seqCnt || got.Command != cmd {
				t.Errorf("\ngot  %#v\nwant RequestSeq=%d Command=%s", got, seqCnt, cmd)
			}
			seqCnt++
		}

		client.RestartFrameRequest()
		expectUnsupportedCommand("restartFrame")

		client.GotoRequest()
		expectUnsupportedCommand("goto")

		client.SourceRequest()
		expectUnsupportedCommand("source")

		client.TerminateThreadsRequest()
		expectUnsupportedCommand("terminateThreads")

		client.StepInTargetsRequest()
		expectUnsupportedCommand("stepInTargets")

		client.GotoTargetsRequest()
		expectUnsupportedCommand("gotoTargets")

		client.CompletionsRequest()
		expectUnsupportedCommand("completions")

		client.DataBreakpointInfoRequest()
		expectUnsupportedCommand("dataBreakpointInfo")

		client.SetDataBreakpointsRequest()
		expectUnsupportedCommand("setDataBreakpoints")

		client.BreakpointLocationsRequest()
		expectUnsupportedCommand("breakpointLocations")

		client.ModulesRequest()
		expectUnsupportedCommand("modules")

		client.DisconnectRequest()
		client.ExpectDisconnectResponse(t)
	})
}

type helperForSetVariable struct {
	t *testing.T
	c *daptest.Client
}

func (h *helperForSetVariable) expectSetVariable(ref int, name, value string) {
	h.t.Helper()
	h.expectSetVariable0(ref, name, value, false)
}

func (h *helperForSetVariable) failSetVariable(ref int, name, value, wantErrInfo string) {
	h.t.Helper()
	h.failSetVariable0(ref, name, value, wantErrInfo, false)
}

func (h *helperForSetVariable) failSetVariableAndStop(ref int, name, value, wantErrInfo string) {
	h.t.Helper()
	h.failSetVariable0(ref, name, value, wantErrInfo, true)
}

func (h *helperForSetVariable) evaluate(expr, want string, hasRef bool) {
	h.t.Helper()
	h.c.EvaluateRequest(expr, 1000, "whatever")
	got := h.c.ExpectEvaluateResponse(h.t)
	checkEval(h.t, got, want, hasRef)
}

func (h *helperForSetVariable) evaluateRegex(expr, want string, hasRef bool) {
	h.t.Helper()
	h.c.EvaluateRequest(expr, 1000, "whatever")
	got := h.c.ExpectEvaluateResponse(h.t)
	checkEvalRegex(h.t, got, want, hasRef)
}

func (h *helperForSetVariable) expectSetVariable0(ref int, name, value string, wantStop bool) {
	h.t.Helper()

	h.c.SetVariableRequest(ref, name, value)
	if wantStop {
		h.c.ExpectStoppedEvent(h.t)
	}
	if got, want := h.c.ExpectSetVariableResponse(h.t), value; got.Success != true || got.Body.Value != want {
		h.t.Errorf("SetVariableRequest(%v, %v)=%#v, want {Success=true, Body.Value=%q", name, value, got, want)
	}
}

func (h *helperForSetVariable) failSetVariable0(ref int, name, value, wantErrInfo string, wantStop bool) {
	h.t.Helper()

	h.c.SetVariableRequest(ref, name, value)
	if wantStop {
		h.c.ExpectStoppedEvent(h.t)
	}
	resp := h.c.ExpectErrorResponse(h.t)
	if got := resp.Body.Error; !stringContainsCaseInsensitive(got.Format, wantErrInfo) {
		h.t.Errorf("got %#v, want error string containing %v", got, wantErrInfo)
	}
}

func (h *helperForSetVariable) variables(ref int) *dap.VariablesResponse {
	h.t.Helper()
	h.c.VariablesRequest(ref)
	return h.c.ExpectVariablesResponse(h.t)
}

// TestSetVariable tests SetVariable features that do not need function call support.
func TestSetVariable(t *testing.T) {
	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			fixture.Source, []int{}, // breakpoints are set within the program.
			[]onBreakpoint{{
				execute: func() {
					tester := &helperForSetVariable{t, client}

					checkStop(t, client, 1, "main.foobar", []int{65, 66})

					// Local variables
					locals := tester.variables(localsScope)

					// Args of foobar(baz string, bar FooBar)
					checkVarExact(t, locals, 1, "bar", "bar", `main.FooBar {Baz: 10, Bur: "lorem"}`, "main.FooBar", hasChildren)
					tester.failSetVariable(localsScope, "bar", `main.FooBar {Baz: 42, Bur: "ipsum"}`, "*ast.CompositeLit not implemented")

					// Nested field.
					barRef := checkVarExact(t, locals, 1, "bar", "bar", `main.FooBar {Baz: 10, Bur: "lorem"}`, "main.FooBar", hasChildren)
					tester.expectSetVariable(barRef, "Baz", "42")
					tester.evaluate("bar", `main.FooBar {Baz: 42, Bur: "lorem"}`, hasChildren)

					tester.failSetVariable(barRef, "Baz", `"string"`, "can not")

					// int
					checkVarExact(t, locals, -1, "a2", "a2", "6", "int", noChildren)
					tester.expectSetVariable(localsScope, "a2", "42")
					tester.evaluate("a2", "42", noChildren)

					tester.failSetVariable(localsScope, "a2", "false", "can not convert")

					// float
					checkVarExact(t, locals, -1, "a3", "a3", "7.23", "float64", noChildren)
					tester.expectSetVariable(localsScope, "a3", "-0.1")
					tester.evaluate("a3", "-0.1", noChildren)

					// array of int
					a4Ref := checkVarExact(t, locals, -1, "a4", "a4", "[2]int [1,2]", "[2]int", hasChildren)
					tester.expectSetVariable(a4Ref, "[1]", "-7")
					tester.evaluate("a4", "[2]int [1,-7]", hasChildren)

					tester.failSetVariable(localsScope, "a4", "[2]int{3, 4}", "not implemented")

					// slice of int
					a5Ref := checkVarExact(t, locals, -1, "a5", "a5", "[]int len: 5, cap: 5, [1,2,3,4,5]", "[]int", hasChildren)
					tester.expectSetVariable(a5Ref, "[3]", "100")
					tester.evaluate("a5", "[]int len: 5, cap: 5, [1,2,3,100,5]", hasChildren)

					// composite literal and its nested fields.
					a7Ref := checkVarExact(t, locals, -1, "a7", "a7", `*main.FooBar {Baz: 5, Bur: "strum"}`, "*main.FooBar", hasChildren)
					a7Val := tester.variables(a7Ref)
					a7ValRef := checkVarExact(t, a7Val, -1, "", "(*a7)", `main.FooBar {Baz: 5, Bur: "strum"}`, "main.FooBar", hasChildren)
					tester.expectSetVariable(a7ValRef, "Baz", "7")
					tester.evaluate("(*a7)", `main.FooBar {Baz: 7, Bur: "strum"}`, hasChildren)

					// pointer
					checkVarExact(t, locals, -1, "a9", "a9", `*main.FooBar nil`, "*main.FooBar", noChildren)
					tester.expectSetVariable(localsScope, "a9", "&a6")
					tester.evaluate("a9", `*main.FooBar {Baz: 8, Bur: "word"}`, hasChildren)

					// slice of pointers
					a13Ref := checkVarExact(t, locals, -1, "a13", "a13", `[]*main.FooBar len: 3, cap: 3, [*{Baz: 6, Bur: "f"},*{Baz: 7, Bur: "g"},*{Baz: 8, Bur: "h"}]`, "[]*main.FooBar", hasChildren)
					a13 := tester.variables(a13Ref)
					a13c0Ref := checkVarExact(t, a13, -1, "[0]", "a13[0]", `*main.FooBar {Baz: 6, Bur: "f"}`, "*main.FooBar", hasChildren)
					a13c0 := tester.variables(a13c0Ref)
					a13c0valRef := checkVarExact(t, a13c0, -1, "", "(*a13[0])", `main.FooBar {Baz: 6, Bur: "f"}`, "main.FooBar", hasChildren)
					tester.expectSetVariable(a13c0valRef, "Baz", "777")
					tester.evaluate("a13[0]", `*main.FooBar {Baz: 777, Bur: "f"}`, hasChildren)

					// complex
					tester.evaluate("c64", `(1 + 2i)`, hasChildren)
					tester.expectSetVariable(localsScope, "c64", "(2 + 3i)")
					tester.evaluate("c64", `(2 + 3i)`, hasChildren)
					// note: complex's real, imaginary part can't be directly mutable.

					//
					// Global variables
					//    p1 = 10
					client.VariablesRequest(globalsScope)
					globals := client.ExpectVariablesResponse(t)

					checkVarExact(t, globals, -1, "p1", "main.p1", "10", "int", noChildren)
					tester.expectSetVariable(globalsScope, "p1", "-10")
					tester.evaluate("p1", "-10", noChildren)
					tester.failSetVariable(globalsScope, "p1", "0.1", "can not convert")
				},
				disconnect: true,
			}})
	})

	runTest(t, "testvariables2", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			fixture.Source, []int{}, // breakpoints are set within the program.
			[]onBreakpoint{{
				execute: func() {
					tester := &helperForSetVariable{t, client}

					checkStop(t, client, 1, "main.main", -1)
					locals := tester.variables(localsScope)

					// channel
					tester.evaluate("chnil", "chan int nil", noChildren)
					tester.expectSetVariable(localsScope, "chnil", "ch1")
					tester.evaluate("chnil", "chan int 4/11", hasChildren)

					// func
					tester.evaluate("fn2", "nil", noChildren)
					tester.expectSetVariable(localsScope, "fn2", "fn1")
					tester.evaluate("fn2", "main.afunc", noChildren)

					// interface
					tester.evaluate("ifacenil", "interface {} nil", noChildren)
					tester.expectSetVariable(localsScope, "ifacenil", "iface1")
					tester.evaluate("ifacenil", "interface {}(*main.astruct) *{A: 1, B: 2}", hasChildren)

					// interface.(data)
					iface1Ref := checkVarExact(t, locals, -1, "iface1", "iface1", "interface {}(*main.astruct) *{A: 1, B: 2}", "interface {}(*main.astruct)", hasChildren)
					iface1 := tester.variables(iface1Ref)
					iface1DataRef := checkVarExact(t, iface1, -1, "data", "iface1.(data)", "*main.astruct {A: 1, B: 2}", "*main.astruct", hasChildren)
					iface1Data := tester.variables(iface1DataRef)
					iface1DataValueRef := checkVarExact(t, iface1Data, -1, "", "(*iface1.(data))", "main.astruct {A: 1, B: 2}", "main.astruct", hasChildren)
					tester.expectSetVariable(iface1DataValueRef, "A", "2021")
					tester.evaluate("iface1", "interface {}(*main.astruct) *{A: 2021, B: 2}", hasChildren)

					// map: string -> struct
					tester.evaluate(`m1["Malone"]`, "main.astruct {A: 2, B: 3}", hasChildren)
					m1Ref := checkVarRegex(t, locals, -1, "m1", "m1", `.*map\[string\]main\.astruct.*`, `map\[string\]main\.astruct`, hasChildren)
					m1 := tester.variables(m1Ref)
					elem1 := m1.Body.Variables[1]
					tester.expectSetVariable(elem1.VariablesReference, "A", "-9999")
					tester.expectSetVariable(elem1.VariablesReference, "B", "10000")
					tester.evaluate(elem1.EvaluateName, "main.astruct {A: -9999, B: 10000}", hasChildren)

					// map: struct -> int
					m3Ref := checkVarExact(t, locals, -1, "m3", "m3", "map[main.astruct]int [{A: 1, B: 1}: 42, {A: 2, B: 2}: 43, ]", "map[main.astruct]int", hasChildren)
					tester.expectSetVariable(m3Ref, "main.astruct {A: 1, B: 1}", "8888")
					// note: updating keys is possible, but let's not promise anything.
					tester.evaluateRegex("m3", `.*\[\{A: 1, B: 1\}: 8888,.*`, hasChildren)

					// map: struct -> struct
					m4Ref := checkVarRegex(t, locals, -1, "m4", "m4", `map\[main\.astruct]main\.astruct.*\[\{A: 1, B: 1\}: \{A: 11, B: 11\}.*`, `map\[main\.astruct\]main\.astruct`, hasChildren)
					m4 := tester.variables(m4Ref)
					m4Val1Ref := checkVarRegex(t, m4, -1, "[val 0]", `.*0x[0-9a-f]+.*`, `main.astruct.*`, `main\.astruct`, hasChildren)
					tester.expectSetVariable(m4Val1Ref, "A", "-9999")
					tester.evaluateRegex("m4", `.*A: -9999,.*`, hasChildren)

					// unsigned pointer
					checkVarRegex(t, locals, -1, "up1", "up1", `unsafe\.Pointer\(0x[0-9a-f]+\)`, "unsafe.Pointer", noChildren)
					tester.expectSetVariable(localsScope, "up1", "unsafe.Pointer(0x0)")
					tester.evaluate("up1", "unsafe.Pointer(0x0)", noChildren)

					// val := A{val: 1}
					valRef := checkVarExact(t, locals, -1, "val", "val", `main.A {val: 1}`, "main.A", hasChildren)
					tester.expectSetVariable(valRef, "val", "3")
					tester.evaluate("val", `main.A {val: 3}`, hasChildren)
				},
				disconnect: true,
			}})
	})
}

// TestSetVariableWithCall tests SetVariable features that do not depend on function calls support.
func TestSetVariableWithCall(t *testing.T) {
	protest.MustSupportFunctionCalls(t, testBackend)

	runTest(t, "testvariables", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			fixture.Source, []int{},
			[]onBreakpoint{{
				execute: func() {
					tester := &helperForSetVariable{t, client}

					checkStop(t, client, 1, "main.foobar", []int{65, 66})

					// Local variables
					locals := tester.variables(localsScope)

					// Args of foobar(baz string, bar FooBar)
					checkVarExact(t, locals, 0, "baz", "baz", `"bazburzum"`, "string", noChildren)
					tester.expectSetVariable(localsScope, "baz", `"BazBurZum"`)
					tester.evaluate("baz", `"BazBurZum"`, noChildren)

					barRef := checkVarExact(t, locals, 1, "bar", "bar", `main.FooBar {Baz: 10, Bur: "lorem"}`, "main.FooBar", hasChildren)
					tester.expectSetVariable(barRef, "Bur", `"ipsum"`)
					tester.evaluate("bar", `main.FooBar {Baz: 10, Bur: "ipsum"}`, hasChildren)

					checkVarExact(t, locals, -1, "a1", "a1", `"foofoofoofoofoofoo"`, "string", noChildren)
					tester.expectSetVariable(localsScope, "a1", `"barbarbar"`)
					tester.evaluate("a1", `"barbarbar"`, noChildren)

					a6Ref := checkVarExact(t, locals, -1, "a6", "a6", `main.FooBar {Baz: 8, Bur: "word"}`, "main.FooBar", hasChildren)
					tester.failSetVariable(a6Ref, "Bur", "false", "can not convert")

					tester.expectSetVariable(a6Ref, "Bur", `"sentence"`)
					tester.evaluate("a6", `main.FooBar {Baz: 8, Bur: "sentence"}`, hasChildren)

					// stop inside main.barfoo
					client.ContinueRequest(1)
					client.ExpectContinueResponse(t)
					client.ExpectStoppedEvent(t)
					checkStop(t, client, 1, "main.barfoo", -1)

					// Test: set string 'a1' in main.barfoo.
					// This shouldn't affect 'a1' in main.foobar - we will check that in the next breakpoint.
					locals = tester.variables(localsScope)
					checkVarExact(t, locals, -1, "a1", "a1", `"bur"`, "string", noChildren)
					tester.expectSetVariable(localsScope, "a1", `"fur"`)
					tester.evaluate("a1", `"fur"`, noChildren)
					// We will check a1 in main.foobar isn't affected from the next breakpoint.

					client.StackTraceRequest(1, 1, 20)
					res := client.ExpectStackTraceResponse(t)
					if len(res.Body.StackFrames) < 1 {
						t.Fatalf("stack trace response = %#v, wanted at least one stack frame", res)
					}
					outerFrame := res.Body.StackFrames[0].Id
					client.EvaluateRequest("a1", outerFrame, "whatever_context")
					evalRes := client.ExpectEvaluateResponse(t)
					checkEval(t, evalRes, `"barbarbar"`, noChildren)
				},
				disconnect: true,
			}})
	})

	runTest(t, "fncall", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			func() {
				client.LaunchRequestWithArgs(map[string]interface{}{
					"mode": "exec", "program": fixture.Path, "showGlobalVariables": true,
				})
			},
			fixture.Source, []int{}, // breakpoints are set within the program.
			[]onBreakpoint{{
				// Stop at second breakpoint and set a1.
				execute: func() {
					tester := &helperForSetVariable{t, client}

					checkStop(t, client, 1, "main.main", -1)

					_ = tester.variables(localsScope)

					// successful variable set using a function call.
					tester.expectSetVariable(localsScope, "str", `callstacktrace()`)
					tester.evaluateRegex("str", `.*in main.callstacktrace at.*`, noChildren)

					tester.failSetVariableAndStop(localsScope, "str", `callpanic()`, `callpanic panicked`)
					checkStop(t, client, 1, "main.main", -1)

					// breakpoint during a function call.
					tester.failSetVariableAndStop(localsScope, "str", `callbreak()`, "call stopped")

					// TODO(hyangah): continue after this causes runtime error while resuming
					// unfinished injected call.
					//   runtime error: can not convert %!s(<nil>) constant to string
					// This can be reproducible with dlv cli. (`call str = callbreak(); continue`)
				},
				disconnect: true,
			}})
	})
}

func TestOptionalNotYetImplementedResponses(t *testing.T) {
	var got *dap.ErrorResponse
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		seqCnt := 1
		expectNotYetImplemented := func(cmd string) {
			t.Helper()
			got = client.ExpectNotYetImplementedErrorResponse(t)
			if got.RequestSeq != seqCnt || got.Command != cmd {
				t.Errorf("\ngot  %#v\nwant RequestSeq=%d Command=%s", got, seqCnt, cmd)
			}
			seqCnt++
		}

		client.TerminateRequest()
		expectNotYetImplemented("terminate")

		client.RestartRequest()
		expectNotYetImplemented("restart")

		client.SetExpressionRequest()
		expectNotYetImplemented("setExpression")

		client.LoadedSourcesRequest()
		expectNotYetImplemented("loadedSources")

		client.ReadMemoryRequest()
		expectNotYetImplemented("readMemory")

		client.CancelRequest()
		expectNotYetImplemented("cancel")

		client.DisconnectRequest()
		client.ExpectDisconnectResponse(t)
	})
}

func TestBadLaunchRequests(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		seqCnt := 1
		checkFailedToLaunch := func(response *dap.ErrorResponse) {
			t.Helper()
			if response.RequestSeq != seqCnt {
				t.Errorf("RequestSeq got %d, want %d", seqCnt, response.RequestSeq)
			}
			if response.Command != "launch" {
				t.Errorf("Command got %q, want \"launch\"", response.Command)
			}
			if response.Message != "Failed to launch" {
				t.Errorf("Message got %q, want \"Failed to launch\"", response.Message)
			}
			if !checkErrorMessageId(response.Body.Error, FailedToLaunch) {
				t.Errorf("Id got %v, want Id=%d", response.Body.Error, FailedToLaunch)
			}
			seqCnt++
		}

		checkFailedToLaunchWithMessage := func(response *dap.ErrorResponse, errmsg string) {
			t.Helper()
			checkFailedToLaunch(response)
			if !checkErrorMessageFormat(response.Body.Error, errmsg) {
				t.Errorf("\ngot  %v\nwant Format=%q", response.Body.Error, errmsg)
			}
		}

		// Test for the DAP-specific detailed error message.
		client.LaunchRequest("exec", "", stopOnEntry)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		// Bad "program"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": 12345})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"program\" of type string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": nil})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug"})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		// Bad "mode"
		client.LaunchRequest("remote", fixture.Path, stopOnEntry)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - unsupported 'mode' attribute \"remote\"")

		client.LaunchRequest("notamode", fixture.Path, stopOnEntry)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - unsupported 'mode' attribute \"notamode\"")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": 12345, "program": fixture.Path})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"mode\" of type string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": ""}) // empty mode defaults to "debug" (not an error)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		client.LaunchRequestWithArgs(map[string]interface{}{}) // missing mode defaults to "debug" (not an error)
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")

		// Bad "args"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": "foobar"})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal string into \"args\" of type []string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": 12345})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"args\" of type []string")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": []int{1, 2}})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"args\" of type string")

		// Bad "buildFlags"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "buildFlags": 123})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"buildFlags\" of type []string or string")

		// Bad "backend"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "backend": 123})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number …")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "backend": "foo"})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: could not launch process: unknown backend \"foo\"")

		// Bad "substitutePath"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "substitutePath": 123})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into …")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "substitutePath": []interface{}{123}})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot use 123 as 'substitutePath' of type {\"from\":string, \"to\":string}")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "substitutePath": []interface{}{map[string]interface{}{"to": "path2"}}})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - 'substitutePath' requires both 'from' and 'to' entries")

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "substitutePath": []interface{}{map[string]interface{}{"from": "path1", "to": 123}}})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot use {\"from\":\"path1\",\"to\":123} as 'substitutePath' of type {\"from\":string, \"to\":string}")
		// Bad "cwd"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "cwd": 123})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: invalid debug configuration - cannot unmarshal number into \"cwd\" of type string")

		// Skip detailed message checks for potentially different OS-specific errors.
		client.LaunchRequest("exec", fixture.Path+"_does_not_exist", stopOnEntry)
		checkFailedToLaunch(client.ExpectVisibleErrorResponse(t)) // No such file or directory

		client.LaunchRequest("debug", fixture.Path+"_does_not_exist", stopOnEntry)
		oe := client.ExpectOutputEvent(t)
		if !strings.HasPrefix(oe.Body.Output, "Build Error: ") || oe.Body.Category != "stderr" {
			t.Errorf("got %#v, want Category=\"stderr\" Output=\"Build Error: ...\"", oe)
		}
		checkFailedToLaunch(client.ExpectInvisibleErrorResponse(t))

		client.LaunchRequestWithArgs(map[string]interface{}{
			"request": "launch",
			/* mode: debug by default*/
			"program":     fixture.Path + "_does_not_exist",
			"stopOnEntry": stopOnEntry,
		})
		oe = client.ExpectOutputEvent(t)
		if !strings.HasPrefix(oe.Body.Output, "Build Error: ") || oe.Body.Category != "stderr" {
			t.Errorf("got %#v, want Category=\"stderr\" Output=\"Build Error: ...\"", oe)
		}
		checkFailedToLaunch(client.ExpectInvisibleErrorResponse(t))

		client.LaunchRequest("exec", fixture.Source, stopOnEntry)
		checkFailedToLaunch(client.ExpectVisibleErrorResponse(t)) // Not an executable

		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "buildFlags": "-bad -flags"})
		oe = client.ExpectOutputEvent(t)
		if !strings.HasPrefix(oe.Body.Output, "Build Error: ") || oe.Body.Category != "stderr" {
			t.Errorf("got %#v, want Category=\"stderr\" Output=\"Build Error: ...\"", oe)
		}
		checkFailedToLaunchWithMessage(client.ExpectInvisibleErrorResponse(t), "Failed to launch: Build error: Check the debug console for details.")
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "noDebug": true, "buildFlags": "-bad -flags"})
		oe = client.ExpectOutputEvent(t)
		if !strings.HasPrefix(oe.Body.Output, "Build Error: ") || oe.Body.Category != "stderr" {
			t.Errorf("got %#v, want Category=\"stderr\" Output=\"Build Error: ...\"", oe)
		}
		checkFailedToLaunchWithMessage(client.ExpectInvisibleErrorResponse(t), "Failed to launch: Build error: Check the debug console for details.")

		// Bad "cwd"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "noDebug": false, "cwd": "dir/invalid"})
		checkFailedToLaunch(client.ExpectVisibleErrorResponse(t)) // invalid directory, the error message is system-dependent.
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "noDebug": true, "cwd": "dir/invalid"})
		checkFailedToLaunch(client.ExpectVisibleErrorResponse(t)) // invalid directory, the error message is system-dependent.

		// Bad "noDebug"
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "noDebug": "true"})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t), "Failed to launch: invalid debug configuration - cannot unmarshal string into \"noDebug\" of type bool")

		// Bad "replay" parameters
		// These errors come from dap layer
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "replay", "traceDirPath": ""})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The 'traceDirPath' attribute is missing in debug configuration.")
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "replay", "program": fixture.Source, "traceDirPath": ""})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The 'traceDirPath' attribute is missing in debug configuration.")
		// These errors come from debugger layer
		if _, err := exec.LookPath("rr"); err != nil {
			client.LaunchRequestWithArgs(map[string]interface{}{"mode": "replay", "backend": "ignored", "traceDirPath": ".."})
			checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
				"Failed to launch: backend unavailable")
		}

		// Bad "core" parameters
		// These errors come from dap layer
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "core", "coreFilePath": ""})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The program attribute is missing in debug configuration.")
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "core", "program": fixture.Source, "coreFilePath": ""})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: The 'coreFilePath' attribute is missing in debug configuration.")
		// These errors come from debugger layer
		client.LaunchRequestWithArgs(map[string]interface{}{"mode": "core", "backend": "ignored", "program": fixture.Source, "coreFilePath": fixture.Source})
		checkFailedToLaunchWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to launch: unrecognized core format")

		// We failed to launch the program. Make sure shutdown still works.
		client.DisconnectRequest()
		dresp := client.ExpectDisconnectResponse(t)
		if dresp.RequestSeq != seqCnt {
			t.Errorf("got %#v, want RequestSeq=%d", dresp, seqCnt)
		}
	})
}

func TestBadAttachRequest(t *testing.T) {
	runTest(t, "loopprog", func(client *daptest.Client, fixture protest.Fixture) {
		seqCnt := 1
		checkFailedToAttach := func(response *dap.ErrorResponse) {
			t.Helper()
			if response.RequestSeq != seqCnt {
				t.Errorf("RequestSeq got %d, want %d", seqCnt, response.RequestSeq)
			}
			if response.Command != "attach" {
				t.Errorf("Command got %q, want \"attach\"", response.Command)
			}
			if response.Message != "Failed to attach" {
				t.Errorf("Message got %q, want \"Failed to attach\"", response.Message)
			}
			if !checkErrorMessageId(response.Body.Error, FailedToAttach) {
				t.Errorf("Id got %v, want %d", response.Body.Error, FailedToAttach)
			}
			seqCnt++
		}

		checkFailedToAttachWithMessage := func(response *dap.ErrorResponse, errmsg string) {
			t.Helper()
			checkFailedToAttach(response)
			if !checkErrorMessageFormat(response.Body.Error, errmsg) {
				t.Errorf("\ngot  %v\nwant Format=%q", response.Body.Error, errmsg)
			}
		}

		// Bad "mode"
		client.AttachRequest(map[string]interface{}{"mode": "blah blah blah"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: invalid debug configuration - unsupported 'mode' attribute \"blah blah blah\"")

		client.AttachRequest(map[string]interface{}{"mode": 123})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: invalid debug configuration - cannot unmarshal number into \"mode\" of type string")

		client.AttachRequest(map[string]interface{}{"mode": ""}) // empty mode defaults to "local" (not an error)
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' or 'waitFor' attribute is missing in debug configuration")

		client.AttachRequest(map[string]interface{}{}) // no mode defaults to "local" (not an error)
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' or 'waitFor' attribute is missing in debug configuration")

		// Bad "processId"
		client.AttachRequest(map[string]interface{}{"mode": "local"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' or 'waitFor' attribute is missing in debug configuration")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": nil})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' or 'waitFor' attribute is missing in debug configuration")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 0})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: The 'processId' or 'waitFor' attribute is missing in debug configuration")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 1, "waitFor": "loopprog"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: 'processId' and 'waitFor' are mutually exclusive, and can't be specified at the same time")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": "1"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: invalid debug configuration - cannot unmarshal string into \"processId\" of type int")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 1})
		// The exact message varies on different systems, so skip that check
		checkFailedToAttach(client.ExpectVisibleErrorResponse(t)) // could not attach to pid 1

		// This will make debugger.(*Debugger) panic, which we will catch as an internal error.
		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": -1})
		er := client.ExpectInvisibleErrorResponse(t)
		if er.RequestSeq != seqCnt {
			t.Errorf("RequestSeq got %d, want %d", seqCnt, er.RequestSeq)
		}
		seqCnt++
		if er.Command != "" {
			t.Errorf("Command got %q, want \"attach\"", er.Command)
		}
		if !checkErrorMessageFormat(er.Body.Error, "Internal Error: runtime error: index out of range [0] with length 0") {
			t.Errorf("Message got %q, want \"Internal Error: runtime error: index out of range [0] with length 0\"", er.Message)
		}
		if !checkErrorMessageId(er.Body.Error, InternalError) {
			t.Errorf("Id got %v, want Id=%d", er.Body.Error, InternalError)
		}

		// Bad "backend"
		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 1, "backend": 123})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: invalid debug configuration - cannot unmarshal number into …")

		client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 1, "backend": "foo"})
		checkFailedToAttachWithMessage(client.ExpectVisibleErrorResponse(t),
			"Failed to attach: could not attach to pid 1: unknown backend \"foo\"")

		// We failed to attach to the program. Make sure shutdown still works.
		client.DisconnectRequest()
		dresp := client.ExpectDisconnectResponse(t)
		if dresp.RequestSeq != seqCnt {
			t.Errorf("got %#v, want RequestSeq=%d", dresp, seqCnt)
		}
	})
}

func launchDebuggerWithTargetRunning(t *testing.T, fixture string) (*protest.Fixture, *debugger.Debugger) {
	t.Helper()
	fixbin, dbg := launchDebuggerWithTargetHalted(t, fixture)
	running := make(chan struct{})
	var err error
	go func() {
		t.Helper()
		_, err = dbg.Command(&api.DebuggerCommand{Name: api.Continue}, running, nil)
		select {
		case <-running:
		default:
			close(running)
		}
	}()
	<-running
	if err != nil {
		t.Fatal("failed to continue on launch", err)
	}
	return fixbin, dbg
}

func launchDebuggerWithTargetHalted(t *testing.T, fixture string) (*protest.Fixture, *debugger.Debugger) {
	t.Helper()
	fixbin := protest.BuildFixture(fixture, protest.AllNonOptimized)
	cfg := service.Config{
		ProcessArgs: []string{fixbin.Path},
		Debugger:    debugger.Config{Backend: "default"},
	}
	dbg, err := debugger.New(&cfg.Debugger, cfg.ProcessArgs) // debugger halts process on entry
	if err != nil {
		t.Fatal("failed to start debugger:", err)
	}
	return &fixbin, dbg
}

func attachDebuggerWithTargetHalted(t *testing.T, fixture string) (*exec.Cmd, *debugger.Debugger) {
	t.Helper()
	fixbin := protest.BuildFixture(fixture, protest.AllNonOptimized)
	cmd := execFixture(t, fixbin)
	cfg := service.Config{Debugger: debugger.Config{Backend: "default", AttachPid: cmd.Process.Pid}}
	dbg, err := debugger.New(&cfg.Debugger, nil) // debugger halts process on entry
	if err != nil {
		t.Fatal("failed to start debugger:", err)
	}
	return cmd, dbg
}

// runTestWithDebugger starts the server and sets its debugger, initializes a debug session,
// runs test, then disconnects. Expects no running async handler at the end of test() (either
// process is halted or debug session never launched.)
func runTestWithDebugger(t *testing.T, dbg *debugger.Debugger, test func(c *daptest.Client)) {
	serverStopped := make(chan struct{})
	server, _ := startDAPServer(t, false, serverStopped)
	client := daptest.NewClient(server.listener.Addr().String())
	time.Sleep(100 * time.Millisecond) // Give time for connection to be set as dap.Session
	server.sessionMu.Lock()
	if server.session == nil {
		t.Fatal("DAP session is not ready")
	}
	// Mock dap.NewSession arguments, so
	// this dap.Server can be used as a proxy for
	// rpccommon.Server running dap.Session.
	server.session.config.Debugger.AttachPid = dbg.AttachPid()
	server.session.debugger = dbg
	server.sessionMu.Unlock()
	defer client.Close()
	client.InitializeRequest()
	client.ExpectInitializeResponseAndCapabilities(t)

	test(client)

	client.DisconnectRequest()
	if dbg.AttachPid() == 0 { // launched target
		client.ExpectOutputEventDetachingKill(t)
	} else { // attached to target
		client.ExpectOutputEventDetachingNoKill(t)
	}
	client.ExpectDisconnectResponse(t)
	client.ExpectTerminatedEvent(t)

	<-serverStopped
}

func TestAttachRemoteToDlvLaunchHaltedStopOnEntry(t *testing.T) {
	// Halted + stop on entry
	_, dbg := launchDebuggerWithTargetHalted(t, "increment")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": true})
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		client.ConfigurationDoneRequest()
		client.ExpectStoppedEvent(t)
		client.ExpectConfigurationDoneResponse(t)
	})
}

func TestAttachRemoteToDlvAttachHaltedStopOnEntry(t *testing.T) {
	cmd, dbg := attachDebuggerWithTargetHalted(t, "http_server")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": true})
		client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		client.ConfigurationDoneRequest()
		client.ExpectStoppedEvent(t)
		client.ExpectConfigurationDoneResponse(t)
	})
	cmd.Process.Kill()
}

func TestAttachRemoteToHaltedTargetContinueOnEntry(t *testing.T) {
	if runtime.GOARCH == "loong64" {
		t.Skip("skipped on loong64: not passed")
	}

	// Halted + continue on entry
	_, dbg := launchDebuggerWithTargetHalted(t, "http_server")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": false})
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		client.ConfigurationDoneRequest()
		client.ExpectConfigurationDoneResponse(t)
		// Continuing
		time.Sleep(time.Second)
		// Halt to make the disconnect sequence more predictable.
		client.PauseRequest(1)
		expectPauseResponseAndStoppedEvent(t, client)
	})
}

func TestAttachRemoteToRunningTargetStopOnEntry(t *testing.T) {
	fixture, dbg := launchDebuggerWithTargetRunning(t, "loopprog")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": true})
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		// Target is halted here
		client.SetBreakpointsRequest(fixture.Source, []int{8})
		expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}})
		client.ConfigurationDoneRequest()
		client.ExpectStoppedEvent(t)
		client.ExpectConfigurationDoneResponse(t)
		client.ContinueRequest(1)
		client.ExpectContinueResponse(t)
		client.ExpectStoppedEvent(t)
		checkStop(t, client, 1, "main.loop", 8)
	})
}

func TestAttachRemoteToRunningTargetContinueOnEntry(t *testing.T) {
	fixture, dbg := launchDebuggerWithTargetRunning(t, "loopprog")
	runTestWithDebugger(t, dbg, func(client *daptest.Client) {
		client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": false})
		client.ExpectInitializedEvent(t)
		client.ExpectAttachResponse(t)
		// Target is halted here
		client.SetBreakpointsRequest(fixture.Source, []int{8})
		expectSetBreakpointsResponse(t, client, []Breakpoint{{8, fixture.Source, true, ""}})
		client.ConfigurationDoneRequest()
		// Target is restarted here
		client.ExpectConfigurationDoneResponse(t)
		client.ExpectStoppedEvent(t)
		checkStop(t, client, 1, "main.loop", 8)
	})
}

// MultiClientCloseServerMock mocks the rpccommon.Server using a dap.Server to exercise
// the shutdown logic in dap.Session where it does NOT take down the server on close
// in multi-client mode. (The dap mode of the rpccommon.Server is tested in dlv_test).
// The dap.Server is a single-use server. Once its one and only session is closed,
// the server and the target must be taken down manually for the test not to leak.
type MultiClientCloseServerMock struct {
	impl      *Server
	debugger  *debugger.Debugger
	forceStop chan struct{}
	stopped   chan struct{}
}

func NewMultiClientCloseServerMock(t *testing.T, fixture string) *MultiClientCloseServerMock {
	var s MultiClientCloseServerMock
	s.stopped = make(chan struct{})
	s.impl, s.forceStop = startDAPServer(t, false, s.stopped)
	_, s.debugger = launchDebuggerWithTargetHalted(t, "http_server")
	return &s
}

func (s *MultiClientCloseServerMock) acceptNewClient(t *testing.T) *daptest.Client {
	client := daptest.NewClient(s.impl.listener.Addr().String())
	time.Sleep(100 * time.Millisecond) // Give time for connection to be set as dap.Session
	s.impl.sessionMu.Lock()
	if s.impl.session == nil {
		t.Fatal("dap session is not ready")
	}
	// A dap.Server doesn't support accept-multiclient, but we can use this
	// hack to test the inner connection logic that is used by a server that does.
	s.impl.session.config.AcceptMulti = true
	s.impl.session.debugger = s.debugger
	s.impl.sessionMu.Unlock()
	return client
}

func (s *MultiClientCloseServerMock) stop(t *testing.T) {
	close(s.forceStop)
	// If the server doesn't have an active session,
	// closing it would leak the debugger with the target because
	// they are part of dap.Session.
	// We must take it down manually as if we are in rpccommon::ServerImpl::Stop.
	if s.debugger.IsRunning() {
		s.debugger.Command(&api.DebuggerCommand{Name: api.Halt}, nil, nil)
	}
	s.debugger.Detach(true)
}

func (s *MultiClientCloseServerMock) verifyStopped(t *testing.T) {
	if state, err := s.debugger.State(true /*nowait*/); err != proc.ErrProcessDetached && !processExited(state, err) {
		t.Errorf("target leak")
	}
	verifyServerStopped(t, s.impl)
}

// TestAttachRemoteMultiClientDisconnect tests that remote attach doesn't take down
// the server in multi-client mode unless terminateDebuggee is explicitly set.
func TestAttachRemoteMultiClientDisconnect(t *testing.T) {
	closingClientSessionOnly := fmt.Sprintf(daptest.ClosingClient, "halted")
	detachingAndTerminating := "Detaching and terminating target process"
	tests := []struct {
		name              string
		disconnectRequest func(client *daptest.Client)
		expect            string
	}{
		{"default", func(c *daptest.Client) { c.DisconnectRequest() }, closingClientSessionOnly},
		{"terminate=true", func(c *daptest.Client) { c.DisconnectRequestWithKillOption(true) }, detachingAndTerminating},
		{"terminate=false", func(c *daptest.Client) { c.DisconnectRequestWithKillOption(false) }, closingClientSessionOnly},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			server := NewMultiClientCloseServerMock(t, "increment")
			client := server.acceptNewClient(t)
			defer client.Close()

			client.InitializeRequest()
			client.ExpectInitializeResponseAndCapabilities(t)

			client.AttachRequest(map[string]interface{}{"mode": "remote", "stopOnEntry": true})
			client.ExpectCapabilitiesEventSupportTerminateDebuggee(t)
			client.ExpectInitializedEvent(t)
			client.ExpectAttachResponse(t)
			client.ConfigurationDoneRequest()
			client.ExpectStoppedEvent(t)
			client.ExpectConfigurationDoneResponse(t)

			tc.disconnectRequest(client)
			e := client.ExpectOutputEvent(t)
			if matched, _ := regexp.MatchString(tc.expect, e.Body.Output); !matched {
				t.Errorf("\ngot %#v\nwant Output=%q", e, tc.expect)
			}
			client.ExpectDisconnectResponse(t)
			client.ExpectTerminatedEvent(t)
			time.Sleep(10 * time.Millisecond) // give time for things to shut down

			if tc.expect == closingClientSessionOnly {
				// At this point a multi-client server is still running. but session should be done.
				verifySessionStopped(t, server.impl.session)
				// Verify target's running state.
				if server.debugger.IsRunning() {
					t.Errorf("\ngot running=true, want false")
				}
				server.stop(t)
			}
			<-server.stopped
			server.verifyStopped(t)
		})
	}
}

func TestLaunchAttachErrorWhenDebugInProgress(t *testing.T) {
	tests := []struct {
		name string
		dbg  func() *debugger.Debugger
	}{
		{"halted", func() *debugger.Debugger { _, dbg := launchDebuggerWithTargetHalted(t, "increment"); return dbg }},
		{"running", func() *debugger.Debugger { _, dbg := launchDebuggerWithTargetRunning(t, "loopprog"); return dbg }},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			runTestWithDebugger(t, tc.dbg(), func(client *daptest.Client) {
				client.EvaluateRequest("1==1", 0 /*no frame specified*/, "repl")
				if tc.name == "running" {
					client.ExpectInvisibleErrorResponse(t)
				} else {
					client.ExpectEvaluateResponse(t)
				}

				// Both launch and attach requests should go through for additional error checking
				client.AttachRequest(map[string]interface{}{"mode": "local", "processId": 100})
				er := client.ExpectVisibleErrorResponse(t)
				msgRe := regexp.MustCompile("Failed to attach: debug session already in progress at .+ - use remote mode to connect to a server with an active debug session")
				if er.Body.Error == nil || er.Body.Error.Id != FailedToAttach || !msgRe.MatchString(er.Body.Error.Format) {
					t.Errorf("got %#v, want Id=%d Format=%q", er.Body.Error, FailedToAttach, msgRe)
				}
				tests := []string{"debug", "test", "exec", "replay", "core"}
				for _, mode := range tests {
					t.Run(mode, func(t *testing.T) {
						client.LaunchRequestWithArgs(map[string]interface{}{"mode": mode})
						er := client.ExpectVisibleErrorResponse(t)
						msgRe := regexp.MustCompile("Failed to launch: debug session already in progress at .+ - use remote attach mode to connect to a server with an active debug session")
						if er.Body.Error == nil || er.Body.Error.Id != FailedToLaunch || !msgRe.MatchString(er.Body.Error.Format) {
							t.Errorf("got %#v, want Id=%d Format=%q", er.Body.Error, FailedToLaunch, msgRe)
						}
					})
				}
			})
		})
	}
}

func TestBadInitializeRequest(t *testing.T) {
	runInitializeTest := func(args dap.InitializeRequestArguments, err string) {
		t.Helper()
		// Only one initialize request is allowed, so use a new server
		// for each test.
		serverStopped := make(chan struct{})
		client := startDAPServerWithClient(t, false, serverStopped)
		defer client.Close()

		client.InitializeRequestWithArgs(args)
		response := client.ExpectErrorResponse(t)
		if response.Command != "initialize" {
			t.Errorf("Command got %q, want \"launch\"", response.Command)
		}
		if response.Message != "Failed to initialize" {
			t.Errorf("Message got %q, want \"Failed to launch\"", response.Message)
		}
		if !checkErrorMessageId(response.Body.Error, FailedToInitialize) {
			t.Errorf("Id got %v, want Id=%d", response.Body.Error, FailedToInitialize)
		}
		if !checkErrorMessageFormat(response.Body.Error, err) {
			t.Errorf("\ngot  %q\nwant %q", response.Body.Error.Format, err)
		}

		client.DisconnectRequest()
		client.ExpectDisconnectResponse(t)
		<-serverStopped
	}

	// Bad path format.
	runInitializeTest(dap.InitializeRequestArguments{
		AdapterID:       "go",
		PathFormat:      "url", // unsupported 'pathFormat'
		LinesStartAt1:   true,
		ColumnsStartAt1: true,
		Locale:          "en-us",
	},
		"Failed to initialize: Unsupported 'pathFormat' value 'url'.",
	)

	// LinesStartAt1 must be true.
	runInitializeTest(dap.InitializeRequestArguments{
		AdapterID:       "go",
		PathFormat:      "path",
		LinesStartAt1:   false, // only 1-based line numbers are supported
		ColumnsStartAt1: true,
		Locale:          "en-us",
	},
		"Failed to initialize: Only 1-based line numbers are supported.",
	)

	// ColumnsStartAt1 must be true.
	runInitializeTest(dap.InitializeRequestArguments{
		AdapterID:       "go",
		PathFormat:      "path",
		LinesStartAt1:   true,
		ColumnsStartAt1: false, // only 1-based column numbers are supported
		Locale:          "en-us",
	},
		"Failed to initialize: Only 1-based column numbers are supported.",
	)
}

func TestBadlyFormattedMessageToServer(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// Send a badly formatted message to the server, and expect it to close the
		// connection.
		client.BadRequest()
		time.Sleep(100 * time.Millisecond)

		_, err := client.ReadMessage()

		if err != io.EOF {
			t.Errorf("got err=%v, want io.EOF", err)
		}
	})
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		// Send an unknown request message to the server, and expect it to send
		// an error response.
		client.UnknownRequest()
		err := client.ExpectErrorResponse(t)
		if !checkErrorMessageFormat(err.Body.Error, "Internal Error: Request command 'unknown' is not supported (seq: 1)") || err.RequestSeq != 1 {
			t.Errorf("got %v, want  RequestSeq=1 Error=\"Internal Error: Request command 'unknown' is not supported (seq: 1)\"", err)
		}

		// Make sure that the unknown request did not kill the server.
		client.InitializeRequest()
		client.ExpectInitializeResponse(t)

		client.DisconnectRequest()
		client.ExpectDisconnectResponse(t)
	})
}

func TestParseLogPoint(t *testing.T) {
	tests := []struct {
		name           string
		msg            string
		wantTracepoint bool
		wantFormat     string
		wantArgs       []string
		wantErr        bool
	}{
		// Test simple log messages.
		{name: "simple string", msg: "hello, world!", wantTracepoint: true, wantFormat: "hello, world!"},
		{name: "empty string", msg: "", wantTracepoint: false, wantErr: false},
		// Test parse eval expressions.
		{
			name:           "simple eval",
			msg:            "{x}",
			wantTracepoint: true,
			wantFormat:     "%s",
			wantArgs:       []string{"x"},
		},
		{
			name:           "type cast",
			msg:            "hello {string(x)}",
			wantTracepoint: true,
			wantFormat:     "hello %s",
			wantArgs:       []string{"string(x)"},
		},
		{
			name:           "multiple eval",
			msg:            "{x} {y} {z}",
			wantTracepoint: true,
			wantFormat:     "%s %s %s",
			wantArgs:       []string{"x", "y", "z"},
		},
		{
			name:           "eval expressions contain braces",
			msg:            "{interface{}(x)} {myType{y}} {[]myType{{z}}}",
			wantTracepoint: true,
			wantFormat:     "%s %s %s",
			wantArgs:       []string{"interface{}(x)", "myType{y}", "[]myType{{z}}"},
		},
		// Test parse errors.
		{name: "empty evaluation", msg: "{}", wantErr: true},
		{name: "empty space evaluation", msg: "{   \n}", wantErr: true},
		{name: "open brace missing closed", msg: "{", wantErr: true},
		{name: "closed brace missing open", msg: "}", wantErr: true},
		{name: "open brace in expression", msg: `{m["{"]}`, wantErr: true},
		{name: "closed brace in expression", msg: `{m["}"]}`, wantErr: true},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotTracepoint, gotLogMessage, err := parseLogPoint(tt.msg)
			if gotTracepoint != tt.wantTracepoint {
				t.Errorf("parseLogPoint() tracepoint = %v, wantTracepoint %v", gotTracepoint, tt.wantTracepoint)
				return
			}
			if (err != nil) != tt.wantErr {
				t.Errorf("parseLogPoint() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !tt.wantTracepoint {
				return
			}
			if gotLogMessage == nil {
				t.Errorf("parseLogPoint() gotLogMessage = nil, want log message")
				return
			}
			if gotLogMessage.format != tt.wantFormat {
				t.Errorf("parseLogPoint() gotFormat = %v, want %v", gotLogMessage.format, tt.wantFormat)
			}
			if !reflect.DeepEqual(gotLogMessage.args, tt.wantArgs) {
				t.Errorf("parseLogPoint() gotArgs = %v, want %v", gotLogMessage.args, tt.wantArgs)
			}
		})
	}
}

func TestDisassemble(t *testing.T) {
	runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{17},
			[]onBreakpoint{{
				// Stop at line 17
				execute: func() {
					checkStop(t, client, 1, "main.main", 17)

					client.StackTraceRequest(1, 0, 1)
					st := client.ExpectStackTraceResponse(t)
					if len(st.Body.StackFrames) < 1 {
						t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
					}
					// Request the single instruction that the program is stopped at.
					pc := st.Body.StackFrames[0].InstructionPointerReference
					client.DisassembleRequest(pc, 0, 1)
					dr := client.ExpectDisassembleResponse(t)
					if len(dr.Body.Instructions) != 1 {
						t.Errorf("\ngot %#v\nwant len(instructions) = 1", dr)
					} else if dr.Body.Instructions[0].Address != pc {
						t.Errorf("\ngot %#v\nwant instructions[0].Address = %s", dr, pc)
					}

					// Request the instruction that the program is stopped at, and the two
					// surrounding it.
					client.DisassembleRequest(pc, -1, 3)
					dr = client.ExpectDisassembleResponse(t)
					if len(dr.Body.Instructions) != 3 {
						t.Errorf("\ngot %#v\nwant len(instructions) = 3", dr)
					} else if dr.Body.Instructions[1].Address != pc {
						t.Errorf("\ngot %#v\nwant instructions[1].Address = %s", dr, pc)
					}

					// Request zero instructions.
					client.DisassembleRequest(pc, 0, 0)
					dr = client.ExpectDisassembleResponse(t)
					if len(dr.Body.Instructions) != 0 {
						t.Errorf("\ngot %#v\nwant len(instructions) = 0", dr)
					}

					// Request invalid instructions.
					checkInvalidInstruction := func(instructions []dap.DisassembledInstruction, count int, address uint64) {
						if len(instructions) != count {
							t.Errorf("\ngot %#v\nwant len(instructions) = %d", dr, count)
						}
						for i, got := range instructions {
							if got.Instruction != invalidInstruction.Instruction {
								t.Errorf("\ngot [%d].Instruction=%q\nwant = %#v", i, got.Instruction, invalidInstruction.Address)
							}
							addr, err := strconv.ParseUint(got.Address, 0, 64)
							if err != nil {
								t.Error(err)
								continue
							}
							if addr != address {
								t.Errorf("\ngot [%d].Address=%s\nwant = %#x", i, got.Address, address)
							}
						}
					}
					client.DisassembleRequest("0x0", 0, 10)
					checkInvalidInstruction(client.ExpectDisassembleResponse(t).Body.Instructions, 10, 0)

					client.DisassembleRequest(fmt.Sprintf("%#x", uint64(math.MaxUint64)), 0, 10)
					checkInvalidInstruction(client.ExpectDisassembleResponse(t).Body.Instructions, 10, uint64(math.MaxUint64))

					// Bad request, not a number.
					client.DisassembleRequest("hello, world!", 0, 1)
					client.ExpectErrorResponse(t)

					// Bad request, not an address in program.
					client.DisassembleRequest("0x5", 0, 100)
					client.ExpectErrorResponse(t)
				},
				disconnect: true,
			}},
		)
	})
}

func TestAlignPCs(t *testing.T) {
	NUM_FUNCS := 10
	// Create fake functions to test align PCs.
	funcs := make([]proc.Function, NUM_FUNCS)
	for i := 0; i < len(funcs); i++ {
		funcs[i] = proc.Function{
			Entry: uint64(100 + i*10),
			End:   uint64(100 + i*10 + 5),
		}
	}
	bi := &proc.BinaryInfo{
		Functions: funcs,
	}
	type args struct {
		start uint64
		end   uint64
	}
	tests := []struct {
		name      string
		args      args
		wantStart uint64
		wantEnd   uint64
	}{
		{
			name: "out of bounds",
			args: args{
				start: funcs[0].Entry - 5,
				end:   funcs[NUM_FUNCS-1].End + 5,
			},
			wantStart: funcs[0].Entry,         // start of first function
			wantEnd:   funcs[NUM_FUNCS-1].End, // end of last function
		},
		{
			name: "same function",
			args: args{
				start: funcs[1].Entry + 1,
				end:   funcs[1].Entry + 2,
			},
			wantStart: funcs[1].Entry, // start of containing function
			wantEnd:   funcs[1].End,   // end of containing function
		},
		{
			name: "between functions",
			args: args{
				start: funcs[1].End + 1,
				end:   funcs[1].End + 2,
			},
			wantStart: funcs[1].Entry, // start of function before
			wantEnd:   funcs[2].Entry, // start of function after
		},
		{
			name: "start of function",
			args: args{
				start: funcs[2].Entry,
				end:   funcs[5].Entry,
			},
			wantStart: funcs[2].Entry, // start of current function
			wantEnd:   funcs[5].End,   // end of current function
		},
		{
			name: "end of function",
			args: args{
				start: funcs[4].End,
				end:   funcs[8].End,
			},
			wantStart: funcs[4].Entry, // start of current function
			wantEnd:   funcs[9].Entry, // start of next function
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotStart, gotEnd := alignPCs(bi, tt.args.start, tt.args.end)
			if gotStart != tt.wantStart {
				t.Errorf("alignPCs() got start = %v, want %v", gotStart, tt.wantStart)
			}
			if gotEnd != tt.wantEnd {
				t.Errorf("alignPCs() got end = %v, want %v", gotEnd, tt.wantEnd)
			}
		})
	}
}

func TestFindInstructions(t *testing.T) {
	numInstructions := 100
	startPC := 0x1000
	procInstructions := make([]proc.AsmInstruction, numInstructions)
	for i := 0; i < len(procInstructions); i++ {
		procInstructions[i] = proc.AsmInstruction{
			Loc: proc.Location{
				PC: uint64(startPC + 2*i),
			},
		}
	}
	type args struct {
		addr   uint64
		offset int
		count  int
	}
	tests := []struct {
		name             string
		args             args
		wantInstructions []proc.AsmInstruction
		wantOffset       int
		wantErr          bool
	}{
		{
			name: "request all",
			args: args{
				addr:   uint64(startPC),
				offset: 0,
				count:  100,
			},
			wantInstructions: procInstructions,
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request all (with offset)",
			args: args{
				addr:   uint64(startPC + numInstructions), // the instruction addr at numInstructions/2
				offset: -numInstructions / 2,
				count:  numInstructions,
			},
			wantInstructions: procInstructions,
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request half (with offset)",
			args: args{
				addr:   uint64(startPC),
				offset: 0,
				count:  numInstructions / 2,
			},
			wantInstructions: procInstructions[:numInstructions/2],
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request half (with offset)",
			args: args{
				addr:   uint64(startPC),
				offset: numInstructions / 2,
				count:  numInstructions / 2,
			},
			wantInstructions: procInstructions[numInstructions/2:],
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request too many",
			args: args{
				addr:   uint64(startPC),
				offset: 0,
				count:  numInstructions * 2,
			},
			wantInstructions: procInstructions,
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request too many with offset",
			args: args{
				addr:   uint64(startPC),
				offset: -numInstructions,
				count:  numInstructions * 2,
			},
			wantInstructions: procInstructions,
			wantOffset:       numInstructions,
			wantErr:          false,
		},
		{
			name: "request out of bounds",
			args: args{
				addr:   uint64(startPC),
				offset: -numInstructions,
				count:  numInstructions,
			},
			wantInstructions: []proc.AsmInstruction{},
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "request out of bounds",
			args: args{
				addr:   uint64(startPC + 2*(numInstructions-1)),
				offset: 1,
				count:  numInstructions,
			},
			wantInstructions: []proc.AsmInstruction{},
			wantOffset:       0,
			wantErr:          false,
		},
		{
			name: "addr out of bounds (low)",
			args: args{
				addr:   0,
				offset: 0,
				count:  100,
			},
			wantInstructions: nil,
			wantOffset:       -1,
			wantErr:          true,
		},
		{
			name: "addr out of bounds (high)",
			args: args{
				addr:   uint64(startPC + 2*(numInstructions+1)),
				offset: -10,
				count:  20,
			},
			wantInstructions: nil,
			wantOffset:       -1,
			wantErr:          true,
		},
		{
			name: "addr not aligned",
			args: args{
				addr:   uint64(startPC + 1),
				offset: 0,
				count:  20,
			},
			wantInstructions: nil,
			wantOffset:       -1,
			wantErr:          true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotInstructions, gotOffset, err := findInstructions(procInstructions, tt.args.addr, tt.args.offset, tt.args.count)
			if (err != nil) != tt.wantErr {
				t.Errorf("findInstructions() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(gotInstructions, tt.wantInstructions) {
				t.Errorf("findInstructions() got instructions = %v, want %v", gotInstructions, tt.wantInstructions)
			}
			if gotOffset != tt.wantOffset {
				t.Errorf("findInstructions() got offset = %v, want %v", gotOffset, tt.wantOffset)
			}
		})
	}
}

func TestDisassembleCgo(t *testing.T) {
	// Test that disassembling a program containing cgo code does not create problems.
	// See issue #3040
	protest.MustHaveCgo(t)
	runTestBuildFlags(t, "cgodisass", func(client *daptest.Client, fixture protest.Fixture) {
		runDebugSessionWithBPs(t, client, "launch",
			// Launch
			func() {
				client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
			},
			// Set breakpoints
			fixture.Source, []int{11},
			[]onBreakpoint{{
				execute: func() {
					checkStop(t, client, 1, "main.main", 11)

					client.StackTraceRequest(1, 0, 1)
					st := client.ExpectStackTraceResponse(t)
					if len(st.Body.StackFrames) < 1 {
						t.Fatalf("\ngot  %#v\nwant len(stackframes) => 1", st)
					}

					// Request the single instruction that the program is stopped at.
					pc := st.Body.StackFrames[0].InstructionPointerReference

					client.DisassembleRequest(pc, -200, 400)
					client.ExpectDisassembleResponse(t)
				},
				disconnect: true,
			}},
		)
	},
		protest.AllNonOptimized, true)
}

func TestRedirect(t *testing.T) {
	runTest(t, "out_redirect", func(client *daptest.Client, fixture protest.Fixture) {
		// 1 >> initialize, << initialize
		client.InitializeRequest()
		initResp := client.ExpectInitializeResponseAndCapabilities(t)
		if initResp.Seq != 0 || initResp.RequestSeq != 1 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=1", initResp)
		}

		// 2 >> launch, << process, << initialized, << launch
		client.LaunchRequestWithArgs(map[string]interface{}{
			"request":    "launch",
			"mode":       "debug",
			"program":    fixture.Source,
			"outputMode": "remote",
		})
		processEvent := client.ExpectProcessEvent(t)
		if processEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", processEvent)
		}
		initEvent := client.ExpectInitializedEvent(t)
		if initEvent.Seq != 0 {
			t.Errorf("\ngot %#v\nwant Seq=0", initEvent)
		}
		launchResp := client.ExpectLaunchResponse(t)
		if launchResp.Seq != 0 || launchResp.RequestSeq != 2 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=2", launchResp)
		}

		// 5 >> configurationDone, << stopped, << configurationDone
		client.ConfigurationDoneRequest()

		cdResp := client.ExpectConfigurationDoneResponse(t)
		if cdResp.Seq != 0 || cdResp.RequestSeq != 3 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=5", cdResp)
		}

		// 6 << output, << terminated
		var (
			stdout = bytes.NewBufferString("")
			stderr = bytes.NewBufferString("")
		)

	terminatedPoint:
		for {
			message := client.ExpectMessage(t)
			switch m := message.(type) {
			case *dap.OutputEvent:
				switch m.Body.Category {
				case "stdout":
					stdout.WriteString(m.Body.Output)
				case "stderr":
					stderr.WriteString(m.Body.Output)
				default:
					t.Errorf("\ngot %#v\nwant Category='stdout' or 'stderr'", m)
				}
			case *dap.TerminatedEvent:
				break terminatedPoint
			default:
				t.Errorf("\n got %#v, want *dap.OutputEvent or *dap.TerminateResponse", m)
			}
		}

		var (
			expectStdout = "hello world!\nhello world!"
			expectStderr = "hello world!\nhello world! error!"
		)

		// check output
		if expectStdout != stdout.String() {
			t.Errorf("\n got stdout: len:%d\n%s\nwant: len:%d\n%s", stdout.Len(), stdout.String(), len(expectStdout), expectStdout)
		}

		if expectStderr != stderr.String() {
			t.Errorf("\n got stderr: len:%d \n%s\nwant: len:%d\n%s", stderr.Len(), stderr.String(), len(expectStderr), expectStderr)
		}

		// 7 >> disconnect, << disconnect
		client.DisconnectRequest()
		oep := client.ExpectOutputEventProcessExited(t, 0)
		if oep.Seq != 0 || oep.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Seq=0 Category='console'", oep)
		}
		oed := client.ExpectOutputEventDetaching(t)
		if oed.Seq != 0 || oed.Body.Category != "console" {
			t.Errorf("\ngot %#v\nwant Seq=0 Category='console'", oed)
		}
		dResp := client.ExpectDisconnectResponse(t)
		if dResp.Seq != 0 || dResp.RequestSeq != 4 {
			t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=43", dResp)
		}
		client.ExpectTerminatedEvent(t)
	})
}

// Helper functions for checking ErrorMessage field values.

func checkErrorMessageId(er *dap.ErrorMessage, id int) bool {
	return er != nil && er.Id == id
}

func checkErrorMessageFormat(er *dap.ErrorMessage, fmt string) bool {
	if dotdotdot := strings.Index(fmt, "…"); dotdotdot > 0 {
		return er != nil && strings.HasPrefix(er.Format, fmt[:dotdotdot])
	}
	return er != nil && er.Format == fmt
}
