public void TwoFirstBooksCosts16Euros()
{
var shoppingBasket = new ShoppingBasket();
shoppingBasket.Add(new FirstBook());
shoppingBasket.Add(new FirstBook());
var total = shoppingBasket.Total();
var expected = new Euros(16);
Assert.That(total, Is.EqualTo(expected));
}
public void OneFirstBookAndOneSecondBookCosts15Euros20()
{
var shoppingBasket = new ShoppingBasket();
shoppingBasket.Add(new FirstBook());
shoppingBasket.Add(new SecondBook());
var total = shoppingBasket.Total();
var expected = new Euros(15.20);
Assert.That(total, Is.EqualTo(expected));
}