public void CreateCarValidationTest(string modelName, string brand, string carClass, int?seats) { //Arrange var mockUow = new Mock <IUnitOfWork>(); mockUow.Setup(a => a.Cars.Create(It.IsAny <Car>())); //Act var service = new RentService(mockUow.Object); //Assert Assert.Throws <ValidationException>( () => service.CreateCar(new CarDTO { ModelName = modelName, Brand = brand, Class = carClass, Seats = seats })); }