public void BuyWithCreditTestCorrectPrice()
        {
            //init
            var commandMock = new Mock <ICommandBus>();
            var queryMock   = new Mock <IQueryProcessor>();

            const decimal price = 12.2m;

            queryMock.Setup(processor =>
                            processor.ProcessQuery <GetPriceByFlavour, GetPriceByFlavourResponse>(
                                It.Is <GetPriceByFlavour>(byFlavour => byFlavour.Flavour == "f1"))).Returns(() => new GetPriceByFlavourResponse(price));

            var paymentController = new PaymentController(commandMock.Object, queryMock.Object);
            var buy = new CanItemDto("f1", 1, price);

            //act
            paymentController.BuyWithCredit(buy);

            //verify
            commandMock.Verify(bus =>
                               bus.Send(It.Is <CashPayment>(payment =>
                                                            payment.AmountToPay == price)),
                               Times.Never);

            commandMock.Verify(bus =>
                               bus.Send(It.Is <CreditCardPayment>(payment =>
                                                                  payment.AmountToPay == price)),
                               Times.Once);

            commandMock.Verify(bus =>
                               bus.Send(It.Is <EjectCan>(stock =>
                                                         stock.Flavour == buy.Flavour)),
                               Times.Once);
        }