public void GetTest() { var list = new List <Subscriber>() { new Subscriber() { Id = new Guid() } }; var unit = new MockUnitOfWork(); unit.MockRepository(); unit.MockGetAllForRep(list); var service = new SubscriberService(unit.Object); var res = service.Get().GetAwaiter().GetResult(); Assert.NotNull(res); Assert.NotEmpty(res); Assert.IsAssignableFrom <IEnumerable <Subscriber> >(res); }