public void processPaymentWith1Item()
        {
            var orderCore = new OrderCore();

            orderCore.processOrder(new OrderItem[] { new OrderItem("Chicken Wings 6pcs.", 1, 120) });

            Assert.AreEqual(true, orderCore.processPayment(new CashPayment(120)));
        }
        public void processPaymentWith0Item()
        {
            var orderCore = new OrderCore();

            Assert.Throws <Exception>(() => orderCore.processPayment(new CashPayment(120)));
        }