public void TestThatPaymentCannotBeMade_BeforeTotal()
{
sale.BuyItems(inventory.FindItem(1), 6);
sale.BuyItems(inventory.FindItem(2), 6);
sale.BuyItems(inventory.FindItem(3), 6);
sale.MakePayment(40.00M);
Assert.AreEqual(0, sale.AmountDue);
}
public void TestThatSaleStateSwitchesToCompletedState_WhenAFullPaymentIsMadeAfterBeingTotalled()
{
sale.BuyItems(inventory.FindItem(2), 3);
sale.TotalSale();
sale.MakePayment(15M);
Assert.IsTrue(sale.SaleState is CompletedSaleState);
}