public void CheckPaymentFoVideo_LearningtoSki_AddFree_FirstAidVideo()
        {
            // Arrange

            var product = new Product()
            {
                Name = "Lerning To Ski", ProductId = "vid-001", ProductPrice = 28.5f, ProducType = ProductTypes.Videos, Quantity = 1
            };
            var order = new Order()
            {
                OrderId = "ord-0066", CreatedDateTime = DateTime.UtcNow, ProductSelected = new List <Product>()
                {
                    product
                }
            };
            var freeproduct = new Product()
            {
                Name = "First Aid", ProductId = "prd-001", ProductPrice = 28.5f, ProducType = ProductTypes.Videos, Quantity = 1
            };

            IPaymentService   _pytmService = Substitute.For <IPaymentService>();
            IPackagingService _pkgService  = Substitute.For <IPackagingService>();
            //Act

            var result = _pytmService.GetPaymentDetails(order);

            //Assert
            Assert.True(result.TransactionStatus == TransactionStatusConstant.TransactionStatusCompleted);
            var newOrder     = _pkgService.AddFreeComplmentryProduct(order);
            var addedProduct = newOrder.ProductSelected.Find(x => x.ProductId == "prd-001");

            Assert.Equal(freeproduct.ProductId, addedProduct.ProductId);
        }