@Test
public void testGetRoomSimilaritiesByEmoji() {

    Interval timeInterval = new Interval(mentionDate, mentionDate.plusHours(3));
    LabeledDenseMatrix<String> result = underTest.getRoomSimilaritiesByEmoji(timeInterval,
                                                                             true);
    assertEquals(2, result.getLabels().size());
    assertEquals(2, result.getMatrix().length);
}