public void Can_Get_TotalAfterTaxAmount() { var purchaseOrderSut = new SalesOrder(); purchaseOrderSut.AddOrderLine(new OrderLineStubifier().GivenAfterTaxAmount(25m).StubIt()); purchaseOrderSut.AddOrderLine(new OrderLineStubifier().GivenAfterTaxAmount(15m).StubIt()); var totalAfterTaxAmount = purchaseOrderSut.TotalAfterTaxAmount(); Assert.AreEqual(25m + 15m, totalAfterTaxAmount); }