public void Test_InsufficientAmountForPurchase()
        {
            ApolloNorth.VendingMachine vm = new ApolloNorth.VendingMachine(1, 0);
            var result = vm.BuyDrink();

            Assert.IsTrue(result == "Insufficient fund in Account");
        }
        public void Test_SuccessfulPurchase()
        {
            ApolloNorth.VendingMachine vm = new ApolloNorth.VendingMachine(1, 50);
            var result = vm.BuyDrink();

            Assert.IsTrue(result.Contains("CAN Dispensed"));
        }
        public void Test_ZeroQuantityInventory_ZeroAmount()
        {
            ApolloNorth.VendingMachine vm = new ApolloNorth.VendingMachine(0, 0);
            var result = vm.BuyDrink();

            Assert.IsTrue(result == "Inventory Out of Stock");

            Assert.AreEqual(result, "Inventory Out of Stock");
        }