@Override
  public String age(Locale locale, long durationInMillis) {
    DurationLabel.Result duration = DurationLabel.label(durationInMillis);
    return message(locale, duration.key(), null, duration.value());
  }
@Test
  public void get_age_with_dates() {
    assertThat(underTest.age(Locale.ENGLISH, DateUtils.parseDate("2014-01-01"), DateUtils.parseDate("2014-01-02"))).isEqualTo("a day");
  }