[Test]
        public void shouldCorrectlyOrder()
        {
            {
                var product1 = new Product { Name = "Apples", UnitPrice = 4.5m, Discontinued = true };
                var product2 = new Product { Name = "Pears", UnitPrice = 3.5m, Discontinued = false };

                Session.Save(product1);
                Session.Save(product2);

                var orderItems = new List<OrderItem>
                                {
                                    new OrderItem {Id = 1, Quantity = 100, Product = product1},
                                    new OrderItem {Id = 2, Quantity = 200, Product = product2},
                                };

                var customer = new Customer
                {
                    FirstName = "John",
                    LastName = "Doe",
                    AddressLine1 = "1st Street",
                    PostalCode = "78279",
                    City = "Austin",
                    CountryCode = "US"
                };
                var employee = new Employee { FirstName = "Sue", LastName = "Wong" };

                new PersistenceSpecification<Order>(Session)
                    .CheckProperty(o => o.OrderDate, DateTime.Today)
                    .CheckReference(o => o.Customer, customer)
                    .CheckReference(o => o.Employee, employee)
                    .CheckList(o => o.OrderItems, orderItems)
                    .VerifyTheMappings();
            }
        }

        [Test]
        public void shouldCorrectlyProduct()
        {
            new PersistenceSpecification<Product>(Session)
                .CheckProperty(p => p.Name, "Apples")
                .CheckProperty(p => p.UnitPrice, 10.45m)
                .CheckProperty(p => p.Discontinued, true)
                .VerifyTheMappings();
        }