public void WhenPurchaseOrderContains1PhysicalProduct1ShippingSlipShouldBeCreated() { _purchaseOrder.Items.Add(new PurchaseOrderItem { Product = new Book { Name = "Red Rising", ProductID = 789, Author = "Pierce Brown", PublicationDate = new DateTime(2014, 1, 28) }, Quantity = 1 }); _purchaseOrderService.ProcessOrder(_purchaseOrder); var shippingSlips = _shippingRepository.GetCustomerShippingSlips(_purchaseOrder.Customer); Assert.IsNotEmpty(shippingSlips); Assert.IsTrue(shippingSlips.Any(s => s.Product == _purchaseOrder.Items.First().Product)); Assert.IsTrue(shippingSlips.Any(s => s.Customer == _purchaseOrder.Customer)); Assert.IsTrue(shippingSlips.Any(s => s.ShippingAddress == _purchaseOrder.Customer.ShippingAddress)); }