public void Verify_MakeConsumptionSound()
        {
            Drink drink = new Drink("A1", "Compu-Tears", 1.50M, "Drink");
            Gum   gum   = new Gum("B1", "Com-Chew-ter", 0.90M, "Gum");
            Chip  chip  = new Chip("C1", "Computer Chips", 3.15M, "Chip");
            Candy candy = new Candy("D1", "Chocolate Computer Chips", 1.00M, "Candy");

            Assert.AreEqual <string>("Glug Glug, Yum", drink.MakeConsumptionSound());
            Assert.AreEqual <string>("Chew Chew, Yum", gum.MakeConsumptionSound());
            Assert.AreEqual <string>("Crunch Crunch, Yum", chip.MakeConsumptionSound());
            Assert.AreEqual <string>("Munch Munch, Yum", candy.MakeConsumptionSound());
        }