public void GetReviewsTest() { //Arrange var mockUow = new Mock <IUnitOfWork>(); mockUow.Setup(a => a.Reviews.GetAll()).Returns(new List <Review>()); //Act var service = new RentService(mockUow.Object); var result = service.GetReviews(); //Assert Assert.That(result, Is.TypeOf(typeof(List <ReviewDTO>))); }