public void buyCokeAndLemon()
        {
            Coke coke = new Coke();
            Lemon lemon = new Lemon();

            customer.buy(coke);
            customer.buy(lemon);

            string actual = customer.print();
            string expect = "Coke(12.00)+Lemon(5.00) | Total=17.00";

            Assert.AreEqual(expect, actual);
        }
        public void buyCokeTest()
        {
            Coke coke = new Coke();

            customer.buy(coke);
            string actual = customer.print();
            string expect = "Coke(12.00) | Total=12.00";

            Assert.AreEqual(expect, actual);
        }
        public void buyCokeAndAllCondimentTest()
        {
            Coke coke = new Coke();
            Milk milk = new Milk();
            Honey honey = new Honey();
            Lemon lemon = new Lemon();
            Chocolate chocolate = new Chocolate();
            Mocha mocha = new Mocha();

            customer.buy(coke);
            customer.buy(milk);
            customer.buy(honey);
            customer.buy(lemon);
            customer.buy(chocolate);
            customer.buy(mocha);

            string actual = customer.print();
            string expect = "Coke(12.00)+Milk(3.50)+Honey(4.50)+Lemon(5.0)+Chocolate(7.00)+ Mocha(8.0) | Total=40.00";

            Assert.AreEqual(expect, actual);
        }