@Test
public void splitThread() {

    Message topMessage = new MessageImpl();
    Message message2 = new MessageImpl();
    message2.setParent(topMessage);
    Message message3 = new MessageImpl();
    message3.setParent(message2);
    Message message4 = new MessageImpl();
    message4.setParent(message3);
    Message newTopMessage = forumService.splitThread(updaterIdentity, message3);
    assertEquals(message3, newTopMessage);
}