}

  public void testCreateParentDirs_noParentsNeeded() throws IOException {
    File file = file(getTempDir(), "nonexistent.file");
    assertTrue(file.getParentFile().exists());
    Files.createParentDirs(file);
  }

  public void testCreateParentDirs_oneParentNeeded() throws IOException {
    File file = file(getTempDir(), "parent", "nonexistent.file");
    File parent = file.getParentFile();
    assertFalse(parent.exists());