public void TestGivenAValidCheckoutWhenANullBasketIsProcessedThenAnExceptionIsThrown()
{
// Arrange
var checkout = new Checkout();
// Act
double total = checkout.Process(null);
// Assert
}
public void TestGivenAValidCheckoutWhenAnEmptyBasketIsProcessedThenTotalIsZero()
{
// Arrange
var checkout = new Checkout();
// Act
double total = checkout.Process(new Basket());
// Assert
Assert.AreEqual(0.0, total);
}
public void TestGivenAValidCheckoutWhenBasketWithOneBookIsProcessedThenTotalIsSameAsPriceOfBookSecondAttempt()
{
// Arrange
const double PRICE = 1.97;
var checkout = new Checkout();
var basket = new Basket();
basket.Add(new Book() { Price = PRICE });
// Act
double total = checkout.Process(basket);
// Assert
Assert.AreEqual(PRICE, total);
}
public void TestGivenAValidCheckoutWhenBasketWithTwoSameBooksIsProcessedThenTotalIsSameAsTwoTimesThePriceOfThatBook()
{
// Arrange
const double PRICE = 1.99;
var checkout = new Checkout();
var basket = new Basket();
basket.Add(new Book() { Price = PRICE });
basket.Add(new Book() { Price = PRICE });
// Act
double total = checkout.Process(basket);
// Assert
Assert.AreEqual(PRICE * 2, total, 0.0001);
}
