delve/service/dap/server_test.go
polinasok 4be75bec59
service/dap: Add buildFlags error checking and tests in launch requests (#2056)
* service/dap: Add error checking and tests for buildFlags in launch requests

* Clarify with comments and better naming

* Undo redundant support.go changes

* Undo redundant support.go changes (attempt #2)

Co-authored-by: Polina Sokolova <polinasok@users.noreply.github.com>
2020-05-28 14:01:51 -07:00

651 lines
23 KiB
Go

package dap
import (
"flag"
"io"
"net"
"os"
"path/filepath"
"reflect"
"strings"
"sync"
"testing"
"time"
"github.com/go-delve/delve/pkg/logflags"
protest "github.com/go-delve/delve/pkg/proc/test"
"github.com/go-delve/delve/service"
"github.com/go-delve/delve/service/dap/daptest"
"github.com/go-delve/delve/service/debugger"
"github.com/google/go-dap"
)
const stopOnEntry bool = true
func TestMain(m *testing.M) {
var logOutput string
flag.StringVar(&logOutput, "log-output", "", "configures log output")
flag.Parse()
logflags.Setup(logOutput != "", logOutput, "")
os.Exit(protest.RunTestsWithFixtures(m))
}
// name is for _fixtures/<name>.go
func runTest(t *testing.T, name string, test func(c *daptest.Client, f protest.Fixture)) {
var buildFlags protest.BuildFlags
fixture := protest.BuildFixture(name, buildFlags)
// Start the DAP server.
listener, err := net.Listen("tcp", ":0")
if err != nil {
t.Fatal(err)
}
disconnectChan := make(chan struct{})
server := NewServer(&service.Config{
Listener: listener,
DisconnectChan: disconnectChan,
Debugger: debugger.Config{
Backend: "default",
},
})
server.Run()
// Give server time to start listening for clients
time.Sleep(100 * time.Millisecond)
var stopOnce sync.Once
// 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.
go func() {
<-disconnectChan
stopOnce.Do(func() { server.Stop() })
}()
client := daptest.NewClient(listener.Addr().String())
defer client.Close()
defer func() {
stopOnce.Do(func() { server.Stop() })
}()
test(client, fixture)
}
// TestStopOnEntry emulates the message exchange that can be observed with
// VS Code for the most basic debug session with "stopOnEntry" enabled:
// - User selects "Start Debugging": 1 >> initialize
// : 1 << initialize
// : 2 >> launch
// : << 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 << stackTrace (Unable to produce stack trace)
// : 9 >> stackTrace
// : 9 << stackTrace (Unable to produce stack trace)
// - User selects "Continue" : 10 >> continue
// : 10 << continue
// - Program runs to completion : << terminated event
// : 11 >> disconnect
// : 11 << 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 TestStopOnEntry(t *testing.T) {
runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
// 1 >> initialize, << initialize
client.InitializeRequest()
initResp := client.ExpectInitializeResponse(t)
if initResp.Seq != 0 || initResp.RequestSeq != 1 {
t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=1", initResp)
}
// 2 >> launch, << initialized, << launch
client.LaunchRequest("exec", fixture.Path, stopOnEntry)
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, << stackTrace
client.StackTraceRequest()
stResp := client.ExpectErrorResponse(t)
if stResp.Seq != 0 || stResp.RequestSeq != 8 || stResp.Message != "Not yet implemented" {
t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=8 Message=\"Not yet implemented\"", stResp)
}
// 9 >> stackTrace, << stackTrace
client.StackTraceRequest()
stResp = client.ExpectErrorResponse(t)
if stResp.Seq != 0 || stResp.RequestSeq != 9 || stResp.Message != "Not yet implemented" {
t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=9 Message=\"Not yet implemented\"", stResp)
}
// 10 >> continue, << continue, << terminated
client.ContinueRequest(1)
contResp := client.ExpectContinueResponse(t)
if contResp.Seq != 0 || contResp.RequestSeq != 10 {
t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=10", contResp)
}
termEvent := client.ExpectTerminatedEvent(t)
if termEvent.Seq != 0 {
t.Errorf("\ngot %#v\nwant Seq=0", termEvent)
}
// 11 >> disconnect, << disconnect
client.DisconnectRequest()
dResp := client.ExpectDisconnectResponse(t)
if dResp.Seq != 0 || dResp.RequestSeq != 11 {
t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=11", dResp)
}
})
}
// 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.ExpectInitializeResponse(t)
// 2 >> launch, << initialized, << launch
client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
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
// For now continue is blocking and runs until a stop or
// termination. But once we upgrade the server to be async,
// a simultaneous threads request can be made while continue
// is running. Note that vscode-go just keeps track of the
// continue state and would just return a dummy response
// without talking to debugger if continue was in progress.
// TODO(polina): test this once it is possible
client.ExpectTerminatedEvent(t)
// It is possible for the program to terminate before the initial
// threads request is processed.
// 6 >> threads, << threads
client.ThreadsRequest()
tResp := client.ExpectThreadsResponse(t)
if tResp.Seq != 0 || tResp.RequestSeq != 6 || len(tResp.Body.Threads) != 0 {
t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=6 len(Threads)=0", tResp)
}
// 7 >> disconnect, << disconnect
client.DisconnectRequest()
dResp := client.ExpectDisconnectResponse(t)
if dResp.Seq != 0 || dResp.RequestSeq != 7 {
t.Errorf("\ngot %#v\nwant Seq=0, RequestSeq=7", dResp)
}
})
}
// TestSetBreakpoint corresponds to a debug session that is configured to
// continue on entry with a pre-set breakpoint.
func TestSetBreakpoint(t *testing.T) {
runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
client.InitializeRequest()
client.ExpectInitializeResponse(t)
client.LaunchRequest("exec", fixture.Path, !stopOnEntry)
client.ExpectInitializedEvent(t)
client.ExpectLaunchResponse(t)
client.SetBreakpointsRequest(fixture.Source, []int{8, 100})
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 {
t.Errorf("got breakpoints[0] = %#v, want Verified=true, Line=8", bkpt0)
}
client.SetExceptionBreakpointsRequest()
client.ExpectSetExceptionBreakpointsResponse(t)
client.ConfigurationDoneRequest()
client.ExpectConfigurationDoneResponse(t)
// This triggers "continue"
// TODO(polina): add a no-op threads request
// with dummy response here once server becomes async
// to match what happens in VS Code.
stopEvent1 := client.ExpectStoppedEvent(t)
if stopEvent1.Body.Reason != "breakpoint" ||
stopEvent1.Body.ThreadId != 1 ||
!stopEvent1.Body.AllThreadsStopped {
t.Errorf("got %#v, want Body={Reason=\"breakpoint\", ThreadId=1, AllThreadsStopped=true}", stopEvent1)
}
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)
}
// TODO(polina): can we reliably test for these values?
wantMain := dap.Thread{Id: 1, Name: "main.Increment"}
wantRuntime := dap.Thread{Id: 2, Name: "runtime.gopark"}
for _, got := range tResp.Body.Threads {
if !reflect.DeepEqual(got, wantMain) && !strings.HasPrefix(got.Name, "runtime") {
t.Errorf("\ngot %#v\nwant []dap.Thread{%#v, %#v, ...}", tResp.Body.Threads, wantMain, wantRuntime)
}
}
// TODO(polina): add other status checking requests
// that are not yet supported (stackTrace, scopes, variables)
client.ContinueRequest(1)
client.ExpectContinueResponse(t)
// "Continue" is triggered after the response is sent
client.ExpectTerminatedEvent(t)
client.DisconnectRequest()
client.ExpectDisconnectResponse(t)
})
}
// runDebugSesion 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, launchRequest func()) {
client.InitializeRequest()
client.ExpectInitializeResponse(t)
launchRequest()
client.ExpectInitializedEvent(t)
client.ExpectLaunchResponse(t)
// Skip no-op setBreakpoints
// Skip no-op setExceptionBreakpoints
client.ConfigurationDoneRequest()
client.ExpectConfigurationDoneResponse(t)
// Program automatically continues to completion
client.ExpectTerminatedEvent(t)
client.DisconnectRequest()
client.ExpectDisconnectResponse(t)
}
func TestLaunchDebugRequest(t *testing.T) {
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, func() {
// Use the default output directory.
client.LaunchRequestWithArgs(map[string]interface{}{
"mode": "debug", "program": fixture.Source})
})
})
}
func TestLaunchTestRequest(t *testing.T) {
runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
runDebugSession(t, client, func() {
// We reuse the harness that builds, but ignore the built binary,
// only relying on the source to be built in response to LaunchRequest.
fixtures := protest.FindFixturesDir()
testdir, _ := filepath.Abs(filepath.Join(fixtures, "buildtest"))
client.LaunchRequestWithArgs(map[string]interface{}{
"mode": "test", "program": testdir, "output": "__mytestdir"})
})
})
}
// 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, 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, 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,
"buildFlags": "-ldflags '-X main.Hello=World'"})
})
})
}
func TestUnupportedCommandResponses(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.ExceptionInfoRequest()
expectUnsupportedCommand("exceptionInfo")
client.DataBreakpointInfoRequest()
expectUnsupportedCommand("dataBreakpointInfo")
client.SetDataBreakpointsRequest()
expectUnsupportedCommand("setDataBreakpoints")
client.BreakpointLocationsRequest()
expectUnsupportedCommand("breakpointLocations")
client.ModulesRequest()
expectUnsupportedCommand("modules")
})
}
func TestRequiredNotYetImplementedResponses(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.AttachRequest()
expectNotYetImplemented("attach")
client.NextRequest()
expectNotYetImplemented("next")
client.StepInRequest()
expectNotYetImplemented("stepIn")
client.StepOutRequest()
expectNotYetImplemented("stepOut")
client.PauseRequest()
expectNotYetImplemented("pause")
client.StackTraceRequest()
expectNotYetImplemented("stackTrace")
client.ScopesRequest()
expectNotYetImplemented("scopes")
client.VariablesRequest()
expectNotYetImplemented("variables")
client.EvaluateRequest()
expectNotYetImplemented("evaluate")
})
}
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.SetFunctionBreakpointsRequest()
expectNotYetImplemented("setFunctionBreakpoints")
client.StepBackRequest()
expectNotYetImplemented("stepBack")
client.ReverseContinueRequest()
expectNotYetImplemented("reverseContinue")
client.SetVariableRequest()
expectNotYetImplemented("setVariable")
client.SetExpressionRequest()
expectNotYetImplemented("setExpression")
client.LoadedSourcesRequest()
expectNotYetImplemented("loadedSources")
client.ReadMemoryRequest()
expectNotYetImplemented("readMemory")
client.DisassembleRequest()
expectNotYetImplemented("disassemble")
client.CancelRequest()
expectNotYetImplemented("cancel")
})
}
func TestBadLaunchRequests(t *testing.T) {
runTest(t, "increment", func(client *daptest.Client, fixture protest.Fixture) {
seqCnt := 1
expectFailedToLaunch := 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 response.Body.Error.Id != 3000 {
t.Errorf("Id got %d, want 3000", response.Body.Error.Id)
}
seqCnt++
}
expectFailedToLaunchWithMessage := func(response *dap.ErrorResponse, errmsg string) {
t.Helper()
expectFailedToLaunch(response)
if response.Body.Error.Format != errmsg {
t.Errorf("\ngot %q\nwant %q", response.Body.Error.Format, errmsg)
}
}
// Test for the DAP-specific detailed error message.
client.LaunchRequest("exec", "", stopOnEntry)
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: The program attribute is missing in debug configuration.")
client.LaunchRequestWithArgs(map[string]interface{}{"program": 12345})
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: The program attribute is missing in debug configuration.")
client.LaunchRequestWithArgs(map[string]interface{}{"program": nil})
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: The program attribute is missing in debug configuration.")
client.LaunchRequestWithArgs(map[string]interface{}{})
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: The program attribute is missing in debug configuration.")
client.LaunchRequest("remote", fixture.Path, stopOnEntry)
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: Unsupported 'mode' value \"remote\" in debug configuration.")
client.LaunchRequest("notamode", fixture.Path, stopOnEntry)
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: Unsupported 'mode' value \"notamode\" in debug configuration.")
client.LaunchRequestWithArgs(map[string]interface{}{"mode": 12345, "program": fixture.Path})
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: Unsupported 'mode' value %!q(float64=12345) in debug configuration.")
client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": nil})
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: 'args' attribute '<nil>' in debug configuration is not an array.")
client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": 12345})
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: 'args' attribute '12345' in debug configuration is not an array.")
client.LaunchRequestWithArgs(map[string]interface{}{"mode": "exec", "program": fixture.Path, "args": []int{1, 2}})
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: value '1' in 'args' attribute in debug configuration is not a string.")
client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "buildFlags": 123})
expectFailedToLaunchWithMessage(client.ExpectErrorResponse(t),
"Failed to launch: 'buildFlags' attribute '123' in debug configuration is not a string.")
// Skip detailed message checks for potentially different OS-specific errors.
client.LaunchRequest("exec", fixture.Path+"_does_not_exist", stopOnEntry)
expectFailedToLaunch(client.ExpectErrorResponse(t))
client.LaunchRequest("debug", fixture.Path+"_does_not_exist", stopOnEntry)
expectFailedToLaunch(client.ExpectErrorResponse(t)) // Build error
client.LaunchRequest("exec", fixture.Source, stopOnEntry)
expectFailedToLaunch(client.ExpectErrorResponse(t)) // Not an executable
client.LaunchRequestWithArgs(map[string]interface{}{"mode": "debug", "program": fixture.Source, "buildFlags": "123"})
expectFailedToLaunch(client.ExpectErrorResponse(t)) // Build error
// 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 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.UnknownRequest()
time.Sleep(100 * time.Millisecond)
_, err := client.ReadMessage()
if err != io.EOF {
t.Errorf("got err=%v, want io.EOF", err)
}
})
}