public void save_transaction_and_send_confirmation_when_payment_by_check(string paymentMethod, string orderId, decimal amount)
{
var email = new OrderConfirmationEmail(orderId, _customerId, paymentMethod);
_emailGateway.NewEmailFor(orderId, _customerId, paymentMethod).Returns(email);
var transaction = new PaymentTransaction(orderId, amount, paymentMethod);
_paymentService.Pay(amount, _customerId, orderId, paymentMethod);
_transactionRepo.ReceivedWithAnyArgs().Save(transaction);
_emailGateway.Received().Send(email);
}
