public void CanApplyCoffeeSpecialOfferToCoffeeTrolley_ShouldReturn32_00()
{
var checkout = new Checkout(_coffeeTrolley);
var discountedTrolley = checkout.ApplyCoffeeSpecialOffer();
var discountedTotal = checkout.GetTotal();
Assert.AreNotEqual(discountedTrolley, null);
Assert.AreEqual(discountedTrolley.Count(), 4);
Assert.AreEqual(discountedTotal, 32.00);
}