public void ShouldReturnCorrectMachineStateObject()
        {
            var machineService = new MachineService(new ProductRepository());

            var machineState = machineService.GetMachineState();

            Assert.AreEqual(machineState.CreditMoney.Total, Money.Zero.Total);
            Assert.AreEqual(machineState.Products.Count, 4);
        }