/// <summary>
/// Checks out each item in the basket, taking into account any
/// promotions available
/// </summary>
/// <returns>an <see cref="IReceiptView"/> instance representing the view to be rendered</returns>
public IReceiptView Checkout(IEnumerable<BasketItem> basket)
{
// Use the CashRegister to computethe receipt entries
var register = new CashRegister(_promotions);
//Lookup prices for all the grocery items in the basket
var groceryItems = basket.Select(i => _priceList[i.Id]);
//Generate receipt entries
var receiptEntries = register.Process(groceryItems);
// Instantiate the view and render it
return new ConsoleReceiptView(receiptEntries);
}
public static void Process_MultipleItemTypesNoPromotions_CorrectReceiptEntriesMade()
{
// Arrange
var register = new CashRegister(Enumerable.Empty<IPromotion>());
var groceryItems = new[]
{
new GroceryItem("Apples", 1.0m),
new GroceryItem("Apples", 1.0m),
new GroceryItem("Oranges", 2.0m),
new GroceryItem("Oranges", 2.0m),
};
// Act
var receiptEntries = register.Process(groceryItems).ToArray();
// Assert
Assert.That(receiptEntries.Count(), Is.EqualTo(2));
//Test the receipt entry for apples
var applesEntry = receiptEntries.First(e => e.ItemDescription == "Apples");
Assert.That(applesEntry.Quantity, Is.EqualTo(2));
Assert.That(applesEntry.UnitPrice, Is.EqualTo(1.0m));
Assert.That(applesEntry.TotalPrice, Is.EqualTo(2.0m));
Assert.That(applesEntry.Promotion, Is.False);
//Test the receipt entry for oranges
var orangesEntry = receiptEntries.First(e => e.ItemDescription == "Oranges");
Assert.That(orangesEntry.Quantity, Is.EqualTo(2));
Assert.That(orangesEntry.UnitPrice, Is.EqualTo(2.0m));
Assert.That(orangesEntry.TotalPrice, Is.EqualTo(4.0m));
Assert.That(orangesEntry.Promotion, Is.False);
}
public static void Process_OneItemTypeOnePromotion_CorrectReceiptEntriesMade(
string itemId,
int quantity,
decimal unitPrice,
IEnumerable<IPromotion> promotions,
IEnumerable<ReceiptEntry> expectedReceiptEntreEntries)
{
// Arrange
var items = GetItems(itemId, quantity, unitPrice).ToList();
var register = new CashRegister(promotions);
// Act
var actualReceiptEntries = register.Process(items).ToArray();
// Assert
CollectionAssert.AreEqual(actualReceiptEntries, expectedReceiptEntreEntries);
}