Added asserts for verifying customer instances.

Author: claudioig

NorthwindCRUD.Tests/CustomerServiceFixture.cs

@@ -10,9 +10,12 @@ public void ShouldCreateCustomer()
         {
             var customer = DataHelper.GetCustomer();
             var createdCustomer = DataHelper.CustomerService.Create(customer);
-
             Assert.IsNotNull(createdCustomer);
+            Assert.AreEqual(customer, createdCustomer, "Customers instances should be the same since we are over the same context");
+
             createdCustomer = DataHelper2.CustomerService.GetById(createdCustomer.CustomerId);
+            Assert.AreNotEqual(customer, createdCustomer, "Customer instances should be different");
+
             Assert.AreEqual(customer.CompanyName, createdCustomer.CompanyName);
             Assert.AreEqual(customer.ContactName, createdCustomer.ContactName);
             Assert.AreEqual(customer.ContactTitle, createdCustomer.ContactTitle);