Assert.IsInstanceOfType failed in Moq Package in Mvc3

Question

I am Using Moq package for testing a Controller. HomeController.cs

public class HomeController : Controller { readonly IPermitRepository _repository; public HomeController(IPermitRepository rep) { this._repository = rep; } public ViewResult Index() { ViewBag.Message = "Hello World"; PermitModel model = _repository.GetPermitDetails(); return View(model); } }

In HomeControllerTest.cs

 [TestClass] Public class HomeControllerTest { [TestMethod] public void Index() { var messagingService = new Mock<IPermitRepository>(); var controller = new HomeController(messagingService.Object); var result = controller.Index() as ViewResult; Assert.IsInstanceOfType(result.Model, typeof(PermitModel)); } }

But its giving error. Assert.IsInstanceOfType failed. Expected type:. Actual type:<(null)>.

Can some one provide solution and also some inf about Moq package in MVC3. Thanks in advance

nemesv · Accepted Answer · 2012-05-24 14:48:19Z

Moq returns null by default for each non void method call.

So when in your controller you call _repository.GetPermitDetails(); it return null that's why your test fails.

You need to call Setup on your method to return something:

var messagingService = new Mock<IPermitRepository>(); messagingService.Setup(m => m.GetPermitDetails()).Returns(new PermitModel()); var controller = new HomeController(messagingService.Object);

You can find more info in the Moq quickstart on how to customize the mock behaviour.

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