public void Contacts_Create() { var aContact = new Contact { Id = 0 }; // Set test Create method w/o parameters request.Setup(m => m.Post <Response <Contact> >("contacts", aContact, null)).Returns(new Response <Contact> { Data = new Contact { Id = 1234 } }); // Test Get method var result = contactsProxy.Create(aContact); // Verify test Assert.IsNotNull(result); Assert.IsTrue(result.IsSuccessful); Assert.AreEqual(1234, result.Data.Id); }