public async void ProductID_Update_Valid_Reference()
        {
            Mock <ISalesOrderDetailRepository> salesOrderDetailRepository = new Mock <ISalesOrderDetailRepository>();

            salesOrderDetailRepository.Setup(x => x.GetSpecialOfferProduct(It.IsAny <int>())).Returns(Task.FromResult <SpecialOfferProduct>(new SpecialOfferProduct()));

            var validator = new ApiSalesOrderDetailRequestModelValidator(salesOrderDetailRepository.Object);
            await validator.ValidateUpdateAsync(default(int), new ApiSalesOrderDetailRequestModel());

            validator.ShouldNotHaveValidationErrorFor(x => x.ProductID, 1);
        }
        public async void CarrierTrackingNumber_Update_length()
        {
            Mock <ISalesOrderDetailRepository> salesOrderDetailRepository = new Mock <ISalesOrderDetailRepository>();

            salesOrderDetailRepository.Setup(x => x.Get(It.IsAny <int>())).Returns(Task.FromResult(new SalesOrderDetail()));

            var validator = new ApiSalesOrderDetailRequestModelValidator(salesOrderDetailRepository.Object);
            await validator.ValidateUpdateAsync(default(int), new ApiSalesOrderDetailRequestModel());

            validator.ShouldHaveValidationErrorFor(x => x.CarrierTrackingNumber, new string('A', 26));
        }