public void CreateContacts_Succeds() { //Arrange A.CallTo(() => contactInformationService.InsertContact(A <ContactBO> .Ignored)).Returns(5); //Act var response = controller.CreateContact(new ContactBO { Id = 5, FirstName = "Test" }) as OkNegotiatedContentResult <int>; //Assert Assert.IsNotNull(response); Assert.AreEqual(response.Content, 5); }