Make lots of tests run in parallel

Putting t.Parallel() in each test makes them run in parallel.
Additional t.Parallel() could be added to each subtest, although
that requires making a local copy of the loop variable for
table driven tests.

Test: m checkbuild
Change-Id: I5d9869ead441093f4d7c5757f2447385333a95a4
diff --git a/ui/build/cleanbuild_test.go b/ui/build/cleanbuild_test.go
index 89f4ad9..be60362 100644
--- a/ui/build/cleanbuild_test.go
+++ b/ui/build/cleanbuild_test.go
@@ -27,6 +27,7 @@
 )
 
 func TestCleanOldFiles(t *testing.T) {
+	t.Parallel()
 	dir, err := ioutil.TempDir("", "testcleanoldfiles")
 	if err != nil {
 		t.Fatal(err)
diff --git a/ui/build/config_test.go b/ui/build/config_test.go
index 7b14c47..35c6ed4 100644
--- a/ui/build/config_test.go
+++ b/ui/build/config_test.go
@@ -39,6 +39,7 @@
 }
 
 func TestConfigParseArgsJK(t *testing.T) {
+	t.Parallel()
 	ctx := testContext()
 
 	testCases := []struct {
@@ -111,6 +112,7 @@
 }
 
 func TestConfigParseArgsVars(t *testing.T) {
+	t.Parallel()
 	ctx := testContext()
 
 	testCases := []struct {
@@ -638,6 +640,7 @@
 }
 
 func TestConfigSplitArgs(t *testing.T) {
+	t.Parallel()
 	tests := []struct {
 		// ********* Setup *********
 		// Test description.
diff --git a/ui/build/environment_test.go b/ui/build/environment_test.go
index 37f500f..d8f83f4 100644
--- a/ui/build/environment_test.go
+++ b/ui/build/environment_test.go
@@ -21,6 +21,7 @@
 )
 
 func TestEnvUnset(t *testing.T) {
+	t.Parallel()
 	initial := &Environment{"TEST=1", "TEST2=0"}
 	initial.Unset("TEST")
 	got := initial.Environ()
@@ -30,6 +31,7 @@
 }
 
 func TestEnvUnsetMissing(t *testing.T) {
+	t.Parallel()
 	initial := &Environment{"TEST2=0"}
 	initial.Unset("TEST")
 	got := initial.Environ()
@@ -39,6 +41,7 @@
 }
 
 func TestEnvSet(t *testing.T) {
+	t.Parallel()
 	initial := &Environment{}
 	initial.Set("TEST", "0")
 	got := initial.Environ()
@@ -48,6 +51,7 @@
 }
 
 func TestEnvSetDup(t *testing.T) {
+	t.Parallel()
 	initial := &Environment{"TEST=1"}
 	initial.Set("TEST", "0")
 	got := initial.Environ()
@@ -57,6 +61,7 @@
 }
 
 func TestEnvAllow(t *testing.T) {
+	t.Parallel()
 	initial := &Environment{"TEST=1", "TEST2=0", "TEST3=2"}
 	initial.Allow("TEST3", "TEST")
 	got := initial.Environ()
@@ -73,6 +78,7 @@
 `
 
 func TestEnvAppendFromKati(t *testing.T) {
+	t.Parallel()
 	initial := &Environment{"CLANG=/usr/bin/clang", "TEST=0"}
 	err := initial.appendFromKati(strings.NewReader(testKatiEnvFileContents))
 	if err != nil {
diff --git a/ui/build/paths/logs_test.go b/ui/build/paths/logs_test.go
index 3b1005f..d5921a8 100644
--- a/ui/build/paths/logs_test.go
+++ b/ui/build/paths/logs_test.go
@@ -26,6 +26,7 @@
 )
 
 func TestSendLog(t *testing.T) {
+	t.Parallel()
 	t.Run("Short name", func(t *testing.T) {
 		d, err := ioutil.TempDir("", "s")
 		if err != nil {
@@ -105,6 +106,7 @@
 }
 
 func TestSendLogError(t *testing.T) {
+	t.Parallel()
 	d, err := ioutil.TempDir("", "log_socket")
 	if err != nil {
 		t.Fatal(err)
diff --git a/ui/build/proc_sync_test.go b/ui/build/proc_sync_test.go
index 857bea3..1b52fce 100644
--- a/ui/build/proc_sync_test.go
+++ b/ui/build/proc_sync_test.go
@@ -108,6 +108,7 @@
 
 // simple test
 func TestGetLock(t *testing.T) {
+	t.Parallel()
 	lockfile := lockOrFail(t)
 	defer removeTestLock(lockfile)
 }
@@ -119,6 +120,7 @@
 var busyStatus = 2
 
 func TestTrylock(t *testing.T) {
+	t.Parallel()
 	lockpath := os.Getenv(lockPathVariable)
 	if len(lockpath) < 1 {
 		checkTrylockMainProcess(t)
@@ -204,6 +206,7 @@
 }
 
 func TestLockFirstTrySucceeds(t *testing.T) {
+	t.Parallel()
 	noopLogger := logger.New(ioutil.Discard)
 	lock := testLockCountingTo(0)
 	waiter := newCountWaiter(0)
@@ -216,6 +219,7 @@
 	}
 }
 func TestLockThirdTrySucceeds(t *testing.T) {
+	t.Parallel()
 	noopLogger := logger.New(ioutil.Discard)
 	lock := testLockCountingTo(2)
 	waiter := newCountWaiter(2)
@@ -228,6 +232,7 @@
 	}
 }
 func TestLockTimedOut(t *testing.T) {
+	t.Parallel()
 	noopLogger := logger.New(ioutil.Discard)
 	lock := testLockCountingTo(3)
 	waiter := newCountWaiter(2)
diff --git a/ui/build/rbe_test.go b/ui/build/rbe_test.go
index 8ff96bc..fa371bb 100644
--- a/ui/build/rbe_test.go
+++ b/ui/build/rbe_test.go
@@ -26,6 +26,7 @@
 )
 
 func TestDumpRBEMetrics(t *testing.T) {
+	t.Parallel()
 	ctx := testContext()
 	tests := []struct {
 		description string
@@ -81,6 +82,7 @@
 }
 
 func TestDumpRBEMetricsErrors(t *testing.T) {
+	t.Parallel()
 	ctx := testContext()
 	tests := []struct {
 		description      string
diff --git a/ui/build/util_test.go b/ui/build/util_test.go
index b22e997..a06c3e9 100644
--- a/ui/build/util_test.go
+++ b/ui/build/util_test.go
@@ -25,6 +25,7 @@
 )
 
 func TestEnsureEmptyDirs(t *testing.T) {
+	t.Parallel()
 	ctx := testContext()
 	defer logger.Recover(func(err error) {
 		t.Error(err)
@@ -52,6 +53,7 @@
 }
 
 func TestCopyFile(t *testing.T) {
+	t.Parallel()
 	tmpDir, err := ioutil.TempDir("", "test_copy_file")
 	if err != nil {
 		t.Fatalf("failed to create temporary directory to hold test text files: %v", err)
@@ -86,6 +88,7 @@
 }
 
 func TestCopyFileErrors(t *testing.T) {
+	t.Parallel()
 	tmpDir, err := ioutil.TempDir("", "test_copy_file_errors")
 	if err != nil {
 		t.Fatalf("failed to create temporary directory to hold test text files: %v", err)