30DaysOfTDD_Part17_Part2

        [Test]
        public void WhenUserPlacesOrderWithItemThatIsInInventoryOrderFulfillmentWorkflowShouldComplete()
        {
            //Arrange
            var shoppingCart = new ShoppingCart();
            var itemId = Guid.NewGuid();
            shoppingCart.Items.Add(new ShoppingCartItem { ItemId = itemId, Quantity = 1 });
            var customerId = Guid.NewGuid();
            var customer = new Customer { Id = customerId };
            var orderFulfillmentSessionId = Guid.NewGuid();

            Mock.Arrange(() => _customerService.GetCustomer(customerId)).Returns(customer).OccursOnce();

            Mock.Arrange(() => _orderFulfillmentService.OpenSession(Arg.IsAny<string>(), Arg.IsAny<string>()))
                .Returns(orderFulfillmentSessionId)
                .InOrder();

            //Act
            _orderService.PlaceOrder(customerId, shoppingCart);
            
            //Assert
            Mock.Assert(_orderFulfillmentService);
        }