@Test
public void testExtractEntities_nullRoom() {

    String mentionName = "jane";
    String userId = "1";
    String roomId = "100";
    String ent = "Mount Everest";
    Message msg = new Message(DateTime.now(), mentionName, userId,
                              String.format("Today, I'm going to climb %s", ent),
                              roomId, MessageType.MESSAGE);
    FatMessage fatMessage = new FatMessage(msg, user, null);
    List<ChatEntity> entities = underTest.extractEntities(fatMessage);
    assertEquals(1, entities.size());
    assertNull(entities.get(0).getRoomName());
}