@Test
public void toSupportedShouldReturnTimestamp() throws Exception {

    // setup
    final Calendar calendar = Calendar.getInstance();
    calendar.set(2016, Calendar.NOVEMBER, 28, 20, 0, 0);
    // exercise
    final Long actual = underTest.toSupported(calendar.getTime());
    // verify
    assertThat(actual)
            .isEqualTo(calendar.getTimeInMillis());
}