public void GetOrderTest(int?id)
        {
            //Arrange
            var mockUow = new Mock <IUnitOfWork>();

            mockUow.Setup(a => a.Orders.Get(It.IsAny <int>())).Returns(new Order());

            //Act
            var service = new RentService(mockUow.Object);
            var result  = service.GetOrder(id);

            //Assert
            Assert.That(result, Is.TypeOf(typeof(OrderDTO)));
        }
        public void GetOrderValidationTest(int?id)
        {
            //Arrange
            var mockUow = new Mock <IUnitOfWork>();

            mockUow.Setup(a => a.Orders.Get(It.IsAny <int>())).Returns((Order)null);

            //Act
            var service = new RentService(mockUow.Object);

            //Assert
            Assert.Throws <ValidationException>(
                () =>
                service.GetOrder(id));
        }