public void ModifyingToppingsChangesListContents()
        {
            var milkshake = new MintOreoMilkshake();

            milkshake.Mint = false;
            CollectionAssert.Contains(milkshake.SpecialInstructions, "NO Mint.");
        }
        public void MilkshakePriceIsCorrect_Medium()
        {
            var milkshake = new MintOreoMilkshake();

            milkshake.Size = Size.Medium;
            Assert.AreEqual(4.40, milkshake.Price);
        }
        public void MilkshakePriceIsCorrect_Large()
        {
            var milkshake = new MintOreoMilkshake();

            milkshake.Size = Size.Large;
            Assert.AreEqual(5.60, milkshake.Price);
        }
        public void MilkshakePricesIsCorrect_Small()
        {
            var milkshake = new MintOreoMilkshake();

            milkshake.Size = Size.Small;
            Assert.AreEqual(3.30, milkshake.Price);
        }