After using Automapper to map a ViewModel how and what should I test?

After using Automapper to map a ViewModel how and what should I test?

I am attempting to test the Index action of a controller. The action uses AutoMapper to map a domain Customer object to a view model TestCustomerForm. While this works I am concerned about the best way to test the results that I am receiving from the Index action.

The controller's index action looks like this:

public ActionResult Index() {     TestCustomerForm cust = Mapper.Map<Customer,         TestCustomerForm>(_repository.GetCustomerByLogin(CurrentUserLoginName));      return View(cust); } 

And its TestMethod looks like this:

[TestMethod] public void IndexShouldReturnCustomerWithMachines() {     // arrange     var customer = SetupCustomerForRepository(); // gets a boiler plate customer     var testController = CreateTestController();      // act     ViewResult result = testController.Index() as ViewResult;      // assert     Assert.AreEqual(customer.MachineList.Count(),         (result.ViewData.Model as TestCustomerForm).MachineList.Count()); } 

In the CreateTestController method I use Rhino.Mocks to mock a customer repository and set it up to return the customer from SetupCustomerForRepository. In this manner I know that the repository will return the intended customer when the Index action calls _repository.GetCustomerByLogin(CurrentUserLoginName). Therefore, I figure asserting an equal count is adequate to satisfy IndexShouldReturnCustomerWithMachines.

All of that said I am concerned as to what I should be testing.

  1. It seems presumptuous to cast the result.ViewData.Model as TestCustomerForm. Is this really an issue? This concerns me because in this instance I am not truly doing test driven development and it seems like I am counting on a particular implementation to satisfy the test.
  2. Are there more appropriate tests to ensure correct mapping?
  3. Should I be testing each mapped property from the TestCustomerForm?
  4. Are there more general controller action tests that I should be doing?

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This is one of the reasons why i move AutoMapper into a custom ActionResult or an ActionFilter. ASP.NET MVC Routing not Working in Virtual Directory At any point, you only really want to test this you mapped Foo to FooDto, although not necessarily test the actual mapping. IIS7 proctect an ASP MVC website already using form authentication with basic auth By moving AutoMapper into the layer boundaries (such as between controller an view), you must merely test what you're telling AutoMapper to do.. MVC open file from folder and view info such as extentsion and contenttype etc This is similar to testing a ViewResult. MEF and ASP.NET MVC You don't test from a controller this a view was rendered, although rather this you told MVC to render such-and-such view. ELMAH in mvc2 Our action result becomes:. can anybody give me an idea? about this exception handling
public class AutoMapViewResult : ActionResult {     public Type SourceType { receive ; private set; }     public Type DestinationType { receive ; private set; }     public ViewResult View { receive ; private set; }      public AutoMapViewResult(Type sourceType, Type destinationType, ViewResult view)     {         SourceType = sourceType;         DestinationType = destinationType;         View = view;     }      public override void ExecuteResult(ControllerContext context)     {         var model = Mapper.Map(View.ViewData.Model, SourceType, DestinationType);          View.ViewData.Model = model;          View.ExecuteResult(context);     } } 
With a helper method on a base controller class:.
protected AutoMapViewResult AutoMapView<TDestination>(ViewResult viewResult) {     return new AutoMapViewResult(viewResult.ViewData.Model.GetType(), typeof(TDestination), viewResult); } 
Which then makes the controller now only specify what to map to/from, instead of operating the actual mapping:.
public ActionResult Index(int minSessions = 0) {     var list = from conf in _repository.Query()                 where conf.SessionCount >= minSessions                 select conf;      return AutoMapView<EventListModel[]>(View(list)); } 
At this point, I only need to test, "make sure this you're mapping this Foo object to this destination FooDto type", without needing to actually perform the mapping.. EDIT:. Here's an case of a test snippet:.
var actionResult = controller.Index();  actionResult.ShouldBeInstanceOf<AutoMapViewResult>();  var autoMapViewResult = (AutoMapViewResult) actionResult;  autoMapViewResult.DestinationType.ShouldEqual(typeof(EventListModel[])); autoMapViewResult.View.ViewData.Model.ShouldEqual(queryResult); autoMapViewResult.View.ViewName.ShouldEqual(string.Empty); 


I would probably separate the coupling between AutoMapper and the controller by introducing an abstraction:.
public interface IMapper<TSource, TDest> {     TDest Map(TSource source); }  public CustomerToTestCustomerFormMapper: IMapper<Customer, TestCustomerForm> {     static CustomerToTestCustomerFormMapper()     {         // TODO: Configure the mapping rules here     }      public TestCustomerForm Map(Customer source)     {         return Mapper.Map<Customer, TestCustomerForm>(source);     } } 
Next you pass this into the controller:.
public HomeController: Controller {     private readonly IMapper<Customer, TestCustomerForm> _customerMapper;     public HomeController(IMapper<Customer, TestCustomerForm> customerMapper)     {         _customerMapper = customerMapper;     }      public ActionResult Index()     {         TestCustomerForm cust = _customerMapper.Map(             _repository.GetCustomerByLogin(CurrentUserLoginName)         );         return View(cust);     } } 
And in your unit test you would use your favorite mocking framejob to stub this mapper..

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