t.Fatal(err)
	}
	if got, want := fi.Mode(), os.ModeDevice|os.ModeCharDevice|0666; got != want {
		t.Errorf("Open(%q).Stat().Mode() = %v, want %v", "NUL", got, want)
	}
}

func TestStatNUL(t *testing.T) {
	t.Parallel()

	fi, err := os.Stat("NUL")
	if err != nil {
		t.Fatal(err)
	}
	if got, want := fi.Mode(), os.ModeDevice|os.ModeCharDevice|0666; got != want {

				data, origdata)
		}
	}
}

func TestWriterAddFSNonRegularFiles(t *testing.T) {
	fsys := fstest.MapFS{
		"device":  {Data: []byte("hello"), Mode: 0755 | fs.ModeDevice},
		"symlink": {Data: []byte("world"), Mode: 0755 | fs.ModeSymlink},
	}
	var buf bytes.Buffer
	tw := NewWriter(&buf)
	if err := tw.AddFS(fsys); err == nil {
		t.Fatal("expected error, got nil")
	}