cmd/go: parallelize some tests

Cuts tests from 35 to 25 seconds.

Many of these could be parallel if the test runner were modified to
give each test its own workdir cloned from the tempdir files they
use. But later. This helps for now.

Updates #17751

Change-Id: Icc2ff87cca60a33ec5fd8abb1eb0a9ca3e85bf95
Reviewed-on: https://go-review.googlesource.com/32850
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

src/cmd/go/go_test.go

@@ -635,6 +635,7 @@ func TestProgramNameInCrashMessages(t *testing.T) {
 func TestBrokenTestsWithoutTestFunctionsAllFail(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.runFail("test", "./testdata/src/badtest/...")
 	tg.grepBothNot("^ok", "test passed unexpectedly")
 	tg.grepBoth("FAIL.*badtest/badexec", "test did not run everything")
@@ -750,6 +751,7 @@ func TestNewReleaseRebuildsStalePackagesInGOPATH(t *testing.T) {
 func TestGoListStandard(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.cd(runtime.GOROOT() + "/src")
 	tg.run("list", "-f", "{{if not .Standard}}{{.ImportPath}}{{end}}", "./...")
 	stdout := tg.getStdout()
@@ -774,6 +776,7 @@ func TestGoListStandard(t *testing.T) {
 func TestGoInstallCleansUpAfterGoBuild(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.tempFile("src/mycmd/main.go", `package main; func main(){}`)
 	tg.setenv("GOPATH", tg.path("."))
 	tg.cd(tg.path("src/mycmd"))
@@ -865,6 +868,7 @@ func TestGoInstallDetectsRemovedFiles(t *testing.T) {
 func TestWildcardMatchesSyntaxErrorDirs(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.tempFile("src/mypkg/x.go", `package mypkg`)
 	tg.tempFile("src/mypkg/y.go", `pkg mypackage`)
 	tg.setenv("GOPATH", tg.path("."))
@@ -1021,6 +1025,7 @@ func copyBad(tg *testgoData) {
 func TestBadImportsEasy(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	copyBad(tg)
 	testLocalEasy(tg, badDirName)
 }
@@ -1292,6 +1297,7 @@ func TestRelativeImportsGoTestDashI(t *testing.T) {
 func TestRelativeImportsInCommandLinePackage(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	files, err := filepath.Glob("./testdata/testimport/*.go")
 	tg.must(err)
 	tg.run(append([]string{"test"}, files...)...)
@@ -1300,6 +1306,7 @@ func TestRelativeImportsInCommandLinePackage(t *testing.T) {
 func TestNonCanonicalImportPaths(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
 	tg.runFail("build", "canonical/d")
 	tg.grepStderr("package canonical/d", "did not report canonical/d")
@@ -1554,6 +1561,7 @@ func TestGoTestWithPackageListedMultipleTimes(t *testing.T) {
 func TestGoListHasAConsistentOrder(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.run("list", "std")
 	first := tg.getStdout()
 	tg.run("list", "std")
@@ -1565,6 +1573,7 @@ func TestGoListHasAConsistentOrder(t *testing.T) {
 func TestGoListStdDoesNotIncludeCommands(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.run("list", "std")
 	tg.grepStdoutNot("cmd/", "go list std shows commands")
 }
@@ -1572,6 +1581,7 @@ func TestGoListStdDoesNotIncludeCommands(t *testing.T) {
 func TestGoListCmdOnlyShowsCommands(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.run("list", "cmd")
 	out := strings.TrimSpace(tg.getStdout())
 	for _, line := range strings.Split(out, "\n") {
@@ -1585,6 +1595,7 @@ func TestGoListCmdOnlyShowsCommands(t *testing.T) {
 func TestGoListDedupsPackages(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
 	tg.run("list", "xtestonly", "./testdata/src/xtestonly/...")
 	got := strings.TrimSpace(tg.getStdout())
@@ -1598,6 +1609,7 @@ func TestGoListDedupsPackages(t *testing.T) {
 func TestUnsuccessfulGoInstallShouldMentionMissingPackage(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.runFail("install", "foo/quxx")
 	if tg.grepCountBoth(`cannot find package "foo/quxx" in any of`) != 1 {
 		t.Error(`go install foo/quxx expected error: .*cannot find package "foo/quxx" in any of`)
@@ -1607,6 +1619,7 @@ func TestUnsuccessfulGoInstallShouldMentionMissingPackage(t *testing.T) {
 func TestGOROOTSearchFailureReporting(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.runFail("install", "foo/quxx")
 	if tg.grepCountBoth(regexp.QuoteMeta(filepath.Join("foo", "quxx"))+` \(from \$GOROOT\)$`) != 1 {
 		t.Error(`go install foo/quxx expected error: .*foo/quxx (from $GOROOT)`)
@@ -1616,6 +1629,7 @@ func TestGOROOTSearchFailureReporting(t *testing.T) {
 func TestMultipleGOPATHEntriesReportedSeparately(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	sep := string(filepath.ListSeparator)
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata", "a")+sep+filepath.Join(tg.pwd(), "testdata", "b"))
 	tg.runFail("install", "foo/quxx")
@@ -1628,6 +1642,7 @@ func TestMultipleGOPATHEntriesReportedSeparately(t *testing.T) {
 func TestMentionGOPATHInFirstGOPATHEntry(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	sep := string(filepath.ListSeparator)
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata", "a")+sep+filepath.Join(tg.pwd(), "testdata", "b"))
 	tg.runFail("install", "foo/quxx")
@@ -1640,6 +1655,7 @@ func TestMentionGOPATHInFirstGOPATHEntry(t *testing.T) {
 func TestMentionGOPATHNotOnSecondEntry(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	sep := string(filepath.ListSeparator)
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata", "a")+sep+filepath.Join(tg.pwd(), "testdata", "b"))
 	tg.runFail("install", "foo/quxx")
@@ -1652,6 +1668,7 @@ func TestMentionGOPATHNotOnSecondEntry(t *testing.T) {
 func TestMissingGOPATHIsReported(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.setenv("GOPATH", "")
 	tg.runFail("install", "foo/quxx")
 	if tg.grepCountBoth(`\(\$GOPATH not set\. For more details see: 'go help gopath'\)$`) != 1 {
@@ -1702,6 +1719,7 @@ func TestLdflagsArgumentsWithSpacesIssue3941(t *testing.T) {
 func TestGoTestCpuprofileLeavesBinaryBehind(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.makeTempdir()
 	tg.cd(tg.path("."))
 	tg.run("test", "-cpuprofile", "errors.prof", "errors")
@@ -1711,6 +1729,7 @@ func TestGoTestCpuprofileLeavesBinaryBehind(t *testing.T) {
 func TestGoTestCpuprofileDashOControlsBinaryLocation(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.makeTempdir()
 	tg.cd(tg.path("."))
 	tg.run("test", "-cpuprofile", "errors.prof", "-o", "myerrors.test"+exeSuffix, "errors")
@@ -1754,6 +1773,7 @@ func TestSymlinksList(t *testing.T) {
 
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.tempDir("src")
 	tg.must(os.Symlink(tg.path("."), tg.path("src/dir1")))
 	tg.tempFile("src/dir1/p.go", "package p")
@@ -1774,6 +1794,7 @@ func TestSymlinksVendor(t *testing.T) {
 
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.tempDir("gopath/src/dir1/vendor/v")
 	tg.tempFile("gopath/src/dir1/p.go", "package main\nimport _ `v`\nfunc main(){}")
 	tg.tempFile("gopath/src/dir1/vendor/v/v.go", "package v")
@@ -2110,6 +2131,7 @@ func TestCoverageWithCgo(t *testing.T) {
 	for _, dir := range []string{"cgocover", "cgocover2", "cgocover3", "cgocover4"} {
 		t.Run(dir, func(t *testing.T) {
 			tg := testgo(t)
+			tg.parallel()
 			defer tg.cleanup()
 			tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
 			tg.run("test", "-short", "-cover", dir)
@@ -2183,6 +2205,7 @@ func TestCgoHandlesWlORIGIN(t *testing.T) {
 func TestIssue6480(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.makeTempdir()
 	tg.cd(tg.path("."))
 	tg.run("test", "-c", "-test.bench=XXX", "errors")
@@ -2213,8 +2236,7 @@ func main() { C.f() }`)
 }
 
 func TestListTemplateContextFunction(t *testing.T) {
-	tg := testgo(t)
-	defer tg.cleanup()
+	t.Parallel()
 	for _, tt := range []struct {
 		v    string
 		want string
@@ -2230,14 +2252,20 @@ func TestListTemplateContextFunction(t *testing.T) {
 		{"ReleaseTags", ""},
 		{"InstallSuffix", ""},
 	} {
+		tt := tt
+		t.Run(tt.v, func(t *testing.T) {
+			tg := testgo(t)
+			tg.parallel()
+			defer tg.cleanup()
 			tmpl := "{{context." + tt.v + "}}"
 			tg.run("list", "-f", tmpl)
 			if tt.want == "" {
-			continue
+				return
 			}
 			if got := strings.TrimSpace(tg.getStdout()); got != tt.want {
 				t.Errorf("go list -f %q: got %q; want %q", tmpl, got, tt.want)
 			}
+		})
 	}
 }
 
@@ -2488,6 +2516,7 @@ func TestGoGetHTTPS404(t *testing.T) {
 // See golang.org/issue/4210 and golang.org/issue/17475.
 func TestImportMain(t *testing.T) {
 	tg := testgo(t)
+	tg.parallel()
 	defer tg.cleanup()
 
 	// Importing package main from that package main's test should work.
@@ -2574,6 +2603,7 @@ func TestImportMain(t *testing.T) {
 // See golang.org/issue/17475.
 func TestImportLocal(t *testing.T) {
 	tg := testgo(t)
+	tg.parallel()
 	defer tg.cleanup()
 
 	tg.tempFile("src/dir/x/x.go", `package x
@@ -2790,6 +2820,7 @@ func TestGoRunDirs(t *testing.T) {
 
 func TestGoInstallPkgdir(t *testing.T) {
 	tg := testgo(t)
+	tg.parallel()
 	defer tg.cleanup()
 	tg.makeTempdir()
 	pkg := tg.path(".")
@@ -2834,6 +2865,7 @@ func TestGoTestRaceFailures(t *testing.T) {
 	}
 
 	tg := testgo(t)
+	tg.parallel()
 	defer tg.cleanup()
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
 
@@ -3112,6 +3144,7 @@ func TestIssue13655(t *testing.T) {
 // For issue 14337.
 func TestParallelTest(t *testing.T) {
 	tg := testgo(t)
+	tg.parallel()
 	defer tg.cleanup()
 	tg.makeTempdir()
 	const testSrc = `package package_test
@@ -3177,6 +3210,7 @@ func TestIssue17119(t *testing.T) {
 
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
 	tg.runFail("build", "dupload")
 	tg.grepBothNot("duplicate load|internal error", "internal error")
@@ -3185,6 +3219,7 @@ func TestIssue17119(t *testing.T) {
 func TestFatalInBenchmarkCauseNonZeroExitStatus(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.runFail("test", "-run", "^$", "-bench", ".", "./testdata/src/benchfatal")
 	tg.grepBothNot("^ok", "test passed unexpectedly")
 	tg.grepBoth("FAIL.*benchfatal", "test did not run everything")
@@ -3193,6 +3228,7 @@ func TestFatalInBenchmarkCauseNonZeroExitStatus(t *testing.T) {
 func TestBinaryOnlyPackages(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.makeTempdir()
 	tg.setenv("GOPATH", tg.path("."))
 
@@ -3321,6 +3357,7 @@ func TestGoGetUpdateWithWildcard(t *testing.T) {
 
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.makeTempdir()
 	tg.setenv("GOPATH", tg.path("."))
 	const aPkgImportPath = "github.com/tmwh/go-get-issue-14450/a"
@@ -3344,6 +3381,7 @@ func TestGoGetUpdateWithWildcard(t *testing.T) {
 
 func TestGoEnv(t *testing.T) {
 	tg := testgo(t)
+	tg.parallel()
 	defer tg.cleanup()
 	tg.setenv("GOARCH", "arm")
 	tg.run("env", "GOARCH")
@@ -3368,6 +3406,7 @@ const (
 func TestMatchesNoTests(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.run("test", "-run", "ThisWillNotMatch", "testdata/standalone_test.go")
 	tg.grepBoth(noMatchesPattern, "go test did not say [no tests to run]")
 }
@@ -3375,6 +3414,7 @@ func TestMatchesNoTests(t *testing.T) {
 func TestMatchesNoTestsDoesNotOverrideBuildFailure(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
 	tg.runFail("test", "-run", "ThisWillNotMatch", "syntaxerror")
 	tg.grepBothNot(noMatchesPattern, "go test did say [no tests to run]")
@@ -3384,6 +3424,7 @@ func TestMatchesNoTestsDoesNotOverrideBuildFailure(t *testing.T) {
 func TestMatchesNoBenchmarksIsOK(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.run("test", "-run", "^$", "-bench", "ThisWillNotMatch", "testdata/standalone_benchmark_test.go")
 	tg.grepBothNot(noMatchesPattern, "go test did say [no tests to run]")
 	tg.grepBoth(okPattern, "go test did not say ok")
@@ -3392,6 +3433,7 @@ func TestMatchesNoBenchmarksIsOK(t *testing.T) {
 func TestMatchesOnlyExampleIsOK(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.run("test", "-run", "Example", "testdata/example1_test.go")
 	tg.grepBothNot(noMatchesPattern, "go test did say [no tests to run]")
 	tg.grepBoth(okPattern, "go test did not say ok")
@@ -3400,6 +3442,7 @@ func TestMatchesOnlyExampleIsOK(t *testing.T) {
 func TestMatchesOnlyBenchmarkIsOK(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.run("test", "-run", "^$", "-bench", ".", "testdata/standalone_benchmark_test.go")
 	tg.grepBothNot(noMatchesPattern, "go test did say [no tests to run]")
 	tg.grepBoth(okPattern, "go test did not say ok")
@@ -3408,6 +3451,7 @@ func TestMatchesOnlyBenchmarkIsOK(t *testing.T) {
 func TestMatchesOnlyTestIsOK(t *testing.T) {
 	tg := testgo(t)
 	defer tg.cleanup()
+	// TODO: tg.parallel()
 	tg.run("test", "-run", "Test", "testdata/standalone_test.go")
 	tg.grepBothNot(noMatchesPattern, "go test did say [no tests to run]")
 	tg.grepBoth(okPattern, "go test did not say ok")
@@ -3462,6 +3506,7 @@ func TestLinkXImportPathEscape(t *testing.T) {
 	// golang.org/issue/16710
 	tg := testgo(t)
 	defer tg.cleanup()
+	tg.parallel()
 	tg.setenv("GOPATH", filepath.Join(tg.pwd(), "testdata"))
 	exe := "./linkx" + exeSuffix
 	tg.creatingTemp(exe)