public void GetTheGun() { VendingMachineViewModel vendingMachineViewModel = new VendingMachineViewModel(); vendingMachineViewModel.Refill(); vendingMachineViewModel.InsertChangeIntoMachine(Models.CoinWeight.BadCoin, Models.CoinDiameter.BadCoin); vendingMachineViewModel.Purchase(vendingMachineViewModel.Items[3]); Assert.AreEqual(0, vendingMachineViewModel.Items[3].Quantity); }