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);
        }