public void TenPercentDiscount()
{
var catalog = new FakeCatalog();
var toothbrush = new Product("toothbrush", ProductUnitType.Each);
catalog.AddProduct(toothbrush, 0.99);
var apples = new Product("apples", ProductUnitType.Kilo);
catalog.AddProduct(apples, 1.99);
var teller = new Teller(catalog);
teller.AddSpecialOffer(SpecialOfferType.TenPercentDiscount, toothbrush, 10.0);
var cart = new ShoppingCart();
cart.AddItem(apples, 2.5);
var receipt = teller.ChecksOutArticlesFrom(cart);
Assert.That(receipt.TotalPrice, Is.EqualTo(4.975).Within(0.01));
Assert.IsEmpty(receipt.Discounts);
Assert.That(receipt.Items.Count, Is.EqualTo(1));
var receiptItem = receipt.Items[0];
Assert.That(receiptItem.Product, Is.EqualTo(apples));
Assert.That(receiptItem.Price, Is.EqualTo(1.99));
Assert.That(receiptItem.TotalPrice, Is.EqualTo(2.5 * 1.99));
Assert.That(receiptItem.Quantity, Is.EqualTo(2.5));
}
public void AnEmptyShoppingCart_ShouldCostNothing()
{
ISupermarketCatalog catalog = new FakeCatalog();
var teller = new Teller(catalog);
var theCart = new ShoppingCart();
var receipt = teller.ChecksOutArticlesFrom(theCart);
Assert.That(receipt.TotalPrice, Is.EqualTo(0.00));
}
