@Test
@DisplayName("日時を当日の3時に丸める")
public void truncateToRankingDateTimeTodayAM() {

    ZonedDateTime expected = ZonedDateTime.of(2000, 1, 1, 3, 0, 0, 0, JST);
    ZonedDateTime earlier = ZonedDateTime.of(2000, 1, 1, 3, 0, 0, 0, JST);
    ZonedDateTime later = ZonedDateTime.of(2000, 1, 1, 14, 59, 59, 999999, JST);
    assertEquals(expected, DateTimeUtil.truncateToRankingDateTime(earlier));
    assertEquals(expected, DateTimeUtil.truncateToRankingDateTime(later));
}