public void Test11WhenGetListCartOfAnEmptyCartThenIsEmpty()
        {
            IYourBooksApplication application = objectProvider.YourBooksApplication();

            application.RegisterClient("marcos", "123");
            Client aClient = application.Login("marcos", "123");
            Guid   aCartId = application.CreateCart(aClient.Id, aClient.Password);

            Assert.IsTrue(application.ListCart(aCartId).Count == 0);
        }
        public void Test12WhenAddBookToCartAndGetListCartThenIsNotEmpty()
        {
            IYourBooksApplication application = objectProvider.YourBooksApplication();

            application.RegisterClient("marcos", "123");
            Client aClient = application.Login("marcos", "123");
            Guid   aCartId = application.CreateCart(aClient.Id, aClient.Password);

            application.AddAQuantityOfAnItem(1, objectProvider.ABook(), aCartId);

            Assert.IsFalse(application.ListCart(aCartId).Count == 0);
        }