FormsAuthentication.SetAuthCookie mocking using Moq

Question

Hi i'm doing some unit test on my ASP.Net MVC2 project. I'm using Moq framework. In my LogOnController,

[HttpPost]
public ActionResult LogOn(LogOnModel model, string returnUrl = "")
{
  FormsAuthenticationService FormsService = new FormsAuthenticationService();
  FormsService.SignIn(model.UserName, model.RememberMe);

 }

In FormAuthenticationService class,

public class FormsAuthenticationService : IFormsAuthenticationService
    {
        public virtual void SignIn(string userName, bool createPersistentCookie)
        {
            if (String.IsNullOrEmpty(userName)) throw new ArgumentException("Value cannot     be null or empty.", "userName");
            FormsAuthentication.SetAuthCookie(userName, createPersistentCookie);
        }
        public void SignOut()
        {
            FormsAuthentication.SignOut();
        }
    }

My problem is how can i avoid executing

FormsService.SignIn(model.UserName, model.RememberMe);

this line. Or is there any way to Moq

 FormsService.SignIn(model.UserName, model.RememberMe);

using Moq framework without changing my ASP.Net MVC2 project.

Answer 1

Inject IFormsAuthenticationService as a dependency to your LogOnController like this

private IFormsAuthenticationService formsAuthenticationService;
public LogOnController() : this(new FormsAuthenticationService())
{
}

public LogOnController(IFormsAuthenticationService formsAuthenticationService) : this(new FormsAuthenticationService())
{
    this.formsAuthenticationService = formsAuthenticationService;
}

The first constructor is for the framework so that the correct instance of IFormsAuthenticationService is used at runtime.

Now in your tests create an instance of LogonController using the other constructor by passing mock as below

var mockformsAuthenticationService = new Mock<IFormsAuthenticationService>();
//Setup your mock here

Change your action code to use the private field formsAuthenticationService as below

[HttpPost]
public ActionResult LogOn(LogOnModel model, string returnUrl = "")
{
    formsAuthenticationService.SignIn(model.UserName, model.RememberMe);
}

Hope this helps. I have left out the mock setup for you. Let me know if you are not sure how to set that up.