dir1 := slashpath.Join(tmp, "non-existent-directory")
	if isDirEmpty(dir1, true) {
		t.Error("expected false for non-existent directory, got true")
	}

	// Should give false for not-a-directory.
	dir2 := slashpath.Join(tmp, "file")
	err := os.WriteFile(dir2, []byte("hello"), 0o777)
	if err != nil {
		t.Fatal(err)
	}

	if isDirEmpty(dir2, true) {

  private fun generateSomeGarbageFiles() {
    val dir1 = cacheDir / "dir1"
    val dir2 = dir1 / "dir2"
    writeFile(getCleanFile("g1", 0), "A")
    writeFile(getCleanFile("g1", 1), "B")
    writeFile(getCleanFile("g2", 0), "C")
    writeFile(getCleanFile("g2", 1), "D")
    writeFile(getCleanFile("g2", 1), "D")
    writeFile(cacheDir / "otherFile0", "E")
    writeFile(dir2 / "otherFile1", "F")
  }