tests: use t.Name()

We did not use t.Name() as it was not available
before Go 1.8. Now the oldest Go version we support is
Go 1.11, so we can use it.

tests/matrix/matrix_test.go

@@ -822,9 +822,7 @@ func TestMagicNames(t *testing.T) {
 
 // Test that chmod works correctly
 func TestChmod(t *testing.T) {
-	// Note: t.Name() is not available before in Go 1.8
+	path := test_helpers.DefaultPlainDir + "/" + t.Name()
-	tName := "TestChmod"
-	path := test_helpers.DefaultPlainDir + "/" + tName
 	file, err := os.Create(path)
 	if err != nil {
 		t.Fatal(err)
@@ -854,9 +852,7 @@ func TestChmod(t *testing.T) {
 
 // Test that access(2) works correctly
 func TestAccess(t *testing.T) {
-	// Note: t.Name() is not available before in Go 1.8
+	path := test_helpers.DefaultPlainDir + "/" + t.Name()
-	tName := "TestAccess"
-	path := test_helpers.DefaultPlainDir + "/" + tName
 	file, err := os.Create(path)
 	if err != nil {
 		t.Fatal(err)

tests/reverse/correctness_test.go

@@ -225,9 +225,7 @@ func TestTooLongSymlink(t *testing.T) {
 // all directories in the path with O_RDONLY. Now it uses O_PATH, which only needs
 // the executable bit.
 func Test0100Dir(t *testing.T) {
-	// Note: t.Name() is not available before in Go 1.8
+	dir := dirA + "/" + t.Name()
-	tName := "Test0100Dir"
-	dir := dirA + "/" + tName
 	err := os.Mkdir(dir, 0700)
 	if err != nil {
 		t.Fatal(err)
@@ -242,7 +240,7 @@ func Test0100Dir(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	fileReverse := dirC + "/" + tName + "/hello"
+	fileReverse := dirC + "/" + t.Name() + "/hello"
 	fd, err := os.Open(fileReverse)
 	// Make sure the dir can be removed after the test is done
 	os.Chmod(dir, 0700)

tests/test_helpers/helpers.go

@@ -125,7 +125,11 @@ func ResetTmpDir(createDirIV bool) {
 //
 // It returns cipherdir without a trailing slash.
 func InitFS(t *testing.T, extraArgs ...string) string {
-	dir, err := ioutil.TempDir(TmpDir, "")
+	prefix := "x."
+	if t != nil {
+		prefix = t.Name() + "."
+	}
+	dir, err := ioutil.TempDir(TmpDir, prefix)
 	if err != nil {
 		if t != nil {
 			t.Fatal(err)