@Test
public void backShouldShowSystemMessageIfChangeFails() throws CommandException {

    doThrow(new CommandException("Don't come back")).when(controller).comeBack();
    me.setAway(true);
    me.setAwayMsg("Just away");
    parser.parse("/back");
    verify(controller).comeBack();
    verify(messageController).showSystemMessage("Don't come back");
}