func TestNewFileInvalid(t *testing.T) {
	t.Parallel()
	if f := os.NewFile(uintptr(syscall.InvalidHandle), "invalid"); f != nil {
		t.Errorf("NewFile(InvalidHandle) got %v want nil", f)
	}
}

func TestReadDirPipe(t *testing.T) {
	dir := `\\.\pipe\`
	fi, err := os.Stat(dir)
	if err != nil || !fi.IsDir() {
		t.Skipf("%s is not a directory", dir)
	}
	_, err = os.ReadDir(dir)
	if err != nil {