public void MustReturnRefereeIfExistsOrEmptyRefereeObjectIfIdIsInvalid(int id) { RefereesController refereesController = new RefereesController(Mocked()); var referee = refereesController.GetRefereeByID(id); Assert.IsNotNull(referee); Assert.IsInstanceOf <Referee>(referee); Assert.AreEqual(id, referee.ID); }