public void TaxCalculationEngine_CalculateCartTax() { var address = new Address() { First = "Marvin", Last = "Waller", Addr1 = "4928 Commerce Boulevard", State = "Nebraska", City = "Lincoln", Postal = "68508", }; WebStoreCart wsCart = new WebStoreCart() { Id = new Guid("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee"), SubTotal = 15.00m, Total = 15.00m, BillingAddress = address, ShippingAddress = address, CartItems = new WebStoreCartItem[] { new WebStoreCartItem() { ProductId = 1, ProductName = "Test Product 1", UnitPrice = 5.99m, Quantity = 2, ExtendedPrice = 10.00m }, new WebStoreCartItem() { ProductId = 2, ProductName = "Test Product 2", UnitPrice = 5.99m, Quantity = 1, ExtendedPrice = 5.99m }, } }; var taxCalculationEngine = new EngineFactory(new AmbientContext(), null, null).CreateEngine <ITaxCalculationEngine>(); var result = taxCalculationEngine.CalculateCartTax(wsCart); Assert.AreEqual(15.00m, result.SubTotal); Assert.AreEqual(1.12m, result.TaxAmount); Assert.AreEqual(16.12m, result.Total); }