runtime/race: add end-to-end test

Fixes #5933.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/12699051

src/pkg/runtime/crash_test.go

@@ -44,14 +44,16 @@ func executeTest(t *testing.T, templ string, data interface{}) string {
 	src := filepath.Join(dir, "main.go")
 	f, err := os.Create(src)
 	if err != nil {
-		t.Fatalf("failed to create %v: %v", src, err)
+		t.Fatalf("failed to create file: %v", err)
 	}
 	err = st.Execute(f, data)
 	if err != nil {
 		f.Close()
 		t.Fatalf("failed to execute template: %v", err)
 	}
-	f.Close()
+	if err := f.Close(); err != nil {
+		t.Fatalf("failed to close file: %v", err)
+	}
 
 	got, _ := testEnv(exec.Command("go", "run", src)).CombinedOutput()
 	return string(got)

src/pkg/runtime/race/output_test.go

@@ -0,0 +1,109 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build race
+
+package race_test
+
+import (
+	"io/ioutil"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+	"strings"
+	"testing"
+)
+
+func TestOutput(t *testing.T) {
+	for _, test := range tests {
+		dir, err := ioutil.TempDir("", "go-build")
+		if err != nil {
+			t.Fatalf("failed to create temp directory: %v", err)
+		}
+		defer os.RemoveAll(dir)
+		src := filepath.Join(dir, "main.go")
+		f, err := os.Create(src)
+		if err != nil {
+			t.Fatalf("failed to create file: %v", err)
+		}
+		_, err = f.WriteString(test.source)
+		if err != nil {
+			f.Close()
+			t.Fatalf("failed to write: %v", err)
+		}
+		if err := f.Close(); err != nil {
+			t.Fatalf("failed to close file: %v", err)
+		}
+		// Pass -l to the compiler to test stack traces.
+		cmd := exec.Command("go", "run", "-race", "-gcflags=-l", src)
+		// GODEBUG spoils program output, GOMAXPROCS makes it flaky.
+		for _, env := range os.Environ() {
+			if strings.HasPrefix(env, "GODEBUG=") ||
+				strings.HasPrefix(env, "GOMAXPROCS=") {
+				continue
+			}
+			cmd.Env = append(cmd.Env, env)
+		}
+		got, _ := cmd.CombinedOutput()
+		if !regexp.MustCompile(test.re).MatchString(string(got)) {
+			t.Fatalf("failed test case %v, expect:\n%v\ngot:\n%s",
+				test.name, test.re, got)
+		}
+	}
+}
+
+var tests = []struct {
+	name   string
+	source string
+	re     string
+}{
+	{"simple", `
+package main
+func main() {
+	done := make(chan bool)
+	x := 0
+	startRacer(&x, done)
+	store(&x, 43)
+	<-done
+}
+func store(x *int, v int) {
+	*x = v
+}
+func startRacer(x *int, done chan bool) {
+	go racer(x, done)
+}
+func racer(x *int, done chan bool) {
+	store(x, 42)
+	done <- true
+}
+`, `==================
+WARNING: DATA RACE
+Write by goroutine [0-9]:
+  main\.store\(\)
+      .*/main\.go:11 \+0x[0-9,a-f]+
+  main\.racer\(\)
+      .*/main\.go:17 \+0x[0-9,a-f]+
+
+Previous write by goroutine 1:
+  main\.store\(\)
+      .*/main\.go:11 \+0x[0-9,a-f]+
+  main\.main\(\)
+      .*/main\.go:7 \+0x[0-9,a-f]+
+
+Goroutine 3 \(running\) created at:
+  main\.startRacer\(\)
+      .*/main\.go:14 \+0x[0-9,a-f]+
+  main\.main\(\)
+      .*/main\.go:6 \+0x[0-9,a-f]+
+
+Goroutine 1 \(running\) created at:
+  _rt0_go\(\)
+      .*/src/pkg/runtime/asm_amd64\.s:[0-9]+ \+0x[0-9,a-f]+
+
+==================
+Found 1 data race\(s\)
+exit status 66
+`},
+}

src/run.bash

@@ -61,7 +61,8 @@ case "$GOHOSTOS-$GOOS-$GOARCH-$CGO_ENABLED" in
 linux-linux-amd64-1 | darwin-darwin-amd64-1)
 	echo
 	echo '# Testing race detector.'
-	go test -race -i flag
+	go test -race -i runtime/race flag
+	go test -race -run=Output runtime/race
 	go test -race -short flag
 esac