}
	})
}

func TestTempDir(t *testing.T) {
	testTempDir(t)
	t.Run("InSubtest", testTempDir)
	t.Run("test/subtest", testTempDir)
	t.Run("test\\subtest", testTempDir)
	t.Run("test:subtest", testTempDir)
	t.Run("test/..", testTempDir)
	t.Run("../test", testTempDir)
	t.Run("test[]", testTempDir)
	t.Run("test*", testTempDir)
	t.Run("äöüéè", testTempDir)
}

func testTempDir(t *testing.T) {

// test executable itself.
func testcover(t testing.TB) string {
	exe, err := os.Executable()
	if err != nil {
		t.Helper()
		t.Fatal(err)
	}
	return exe
}

// testTempDir is a temporary directory created in TestMain.
var testTempDir string

// If set, this will preserve all the tmpdir files from the test run.
var debug = flag.Bool("debug", false, "keep tmpdir files for debugging")

				}
			} else if err != nil {
				t.Errorf("Unexpected error %v for pattern %q", err, tt.pattern)
			}
		})
	}
}

func TestTempDir(t *testing.T) {
	name, err := TempDir("/_not_exists_", "foo")
	if name != "" || err == nil {
		t.Errorf("TempDir(`/_not_exists_`, `foo`) = %v, %v", name, err)
	}

	tests := []struct {

// standin for 'go tool covdata'.
func testcovdata(t testing.TB) string {
	exe, err := os.Executable()
	if err != nil {
		t.Helper()
		t.Fatal(err)
	}
	return exe
}

// Top level tempdir for test.
var testTempDir string

// If set, this will preserve all the tmpdir files from the test run.
var preserveTmp = flag.Bool("preservetmp", false, "keep tmpdir files for debugging")