Question

here’s my controller

    [POST("signup")]
    public virtual ActionResult Signup(UserRegisterViewModel user)
    {
        if (ModelState.IsValid)
        {
            var newUser = Mapper.Map<UserRegisterViewModel, User>(user);
            var confirmation = _userService.AddUser(newUser);

            if (confirmation.WasSuccessful)
                return RedirectToAction(MVC.Home.Index());
            else
                ModelState.AddModelError("Email", confirmation.Message);

        }
        return View(user);
    }

here’s my unit test:

    [Test]
    public void Signup_Action_When_The_User_Model_Is_Valid_Returns_RedirectToRouteResult()
    {
        // Arrange
        const string expectedRouteName = "~/Views/Home/Index.cshtml";

        var registeredUser = new UserRegisterViewModel { Email = "[e-mail]", Password = "123456789".Hash()};
        var confirmation = new ActionConfirmation<User>
                               {
                                   WasSuccessful = true,
                                   Message = "",
                                   Value = new User()
                               };
        _userService.Setup(r => r.AddUser(new User())).Returns(confirmation);

        _accountController = new AccountController(_userService.Object);

        // Act
        var result = _accountController.Signup(registeredUser) as RedirectToRouteResult;


        // Assert

        Assert.IsNotNull(result, "Should have returned a RedirectToRouteResult");
        Assert.AreEqual(expectedRouteName, result.RouteName, "Route name should be {0}", expectedRouteName);
    }

Unit test failed right here.

        var result = _accountController.Signup(registeredUser) as RedirectToRouteResult;

when I debug my unit test, I got following error message: “Missing type map configuration or unsupported mapping.”

I think its because configuration is in web project, not the unit test project. what should I do to fix it?

Answer 1

You should really use an interface for the mapping engine so that you can mock it rather than using AutoMapper otherwise it is an integration test not a unit test.

AutoMapper has an interface called IMappingEngine that you can inject into your controller using your IoC container like below (this example is using StructureMap).

class MyRegistry : Registry
{
    public MyRegistry()
    {
        For<IMyRepository>().Use<MyRepository>();
        For<ILogger>().Use<Logger>();

        Mapper.AddProfile(new AutoMapperProfile());
        For<IMappingEngine>().Use(() => Mapper.Engine);
    }
}

You will then be able to use dependency injection to inject AutoMapper’s mapping engine into your controller, allowing you to reference your mappings like below:

[POST("signup")]
public virtual ActionResult Signup(UserRegisterViewModel user)
{
    if (ModelState.IsValid)
    {
        var newUser = this.mappingEngine.Map<UserRegisterViewModel, User>(user);
        var confirmation = _userService.AddUser(newUser);

        if (confirmation.WasSuccessful)
            return RedirectToAction(MVC.Home.Index());
        else
            ModelState.AddModelError("Email", confirmation.Message);

    }
    return View(user);
}

You can read more about this here: How to inject AutoMapper IMappingEngine with StructureMap