public void SearchCarsByFilterTest() { //Arrange var mockUow = new Mock <IUnitOfWork>(); mockUow.Setup(a => a.Cars.GetAll()).Returns(new List <Car>()); //Act var service = new RentService(mockUow.Object); var result = service.GetCars(new FilterDTO()); //Assert Assert.That(result, Is.TypeOf(typeof(List <CarDTO>))); }