public void CheckChoosePaymentType()
        {
            Mock <IOrderRepository> repositoryMock = new Mock <IOrderRepository>();
            ShopService             ss             = new ShopService(repositoryMock.Object);

            var    order       = OrderObjectMother.CreateOrderWithNoItems();
            string paymentType = "newPaymentType";

            ss.ChoosePaymentType(order, paymentType);

            Assert.AreEqual(order.PaymentType, paymentType);
        }