public static boolean deleteQuietly(@Nullable File file) {
    if (file == null) {
      return false;
    }
    return deleteQuietly(file.toPath());
  }
@Test
  public void deleteQuietly_does_not_fail_if_argument_is_null() {
    FileUtils.deleteQuietly((File) null);
    FileUtils.deleteQuietly((Path) null);
  }