public void FourOrders200CentEmptyMachine_01()
        {
            int[]    coins        = { 2, 3, 4, 3, 3, 3 };
            string[] productNames = { "Kaffee", "Tee", "Suppe", "Milch" };
            Logic.CoffeeSlotMachine coffeeSlotMachine = new Logic.CoffeeSlotMachine(coins, productNames);
            coffeeSlotMachine.InsertCoin(200);
            coffeeSlotMachine.SelectProduct("Kaffee", out _);
            coffeeSlotMachine.InsertCoin(200);
            coffeeSlotMachine.SelectProduct("Kaffee", out _);
            coffeeSlotMachine.InsertCoin(200);
            coffeeSlotMachine.SelectProduct("Kaffee", out _);
            coffeeSlotMachine.InsertCoin(200);
            coffeeSlotMachine.SelectProduct("Kaffee", out _);

            coffeeSlotMachine.EmptyDepot(out int cents);
            Assert.AreEqual(1400, cents, "7 * 200 Cent");
            Assert.AreEqual(0, coffeeSlotMachine.CoinsInDepot, "Depot wurde geleert");
            coffeeSlotMachine.EmptyDepot(out cents);
            Assert.AreEqual(0, cents, "Depot wurde gerade geleert");
        }