@Test
public void testGetTotalMessageSummaries() {

    Interval interval = new Interval(mentionDate.minusDays(1),  mentionDate.plusDays(1));
    int result = underTest.getTotalMessageSummaries(interval,
                                                    ImmutableList.of(),
                                                    ImmutableList.of(),
                                                    true);
    assertEquals(4, result);
}