While trying to implement the second answer to a previous question, I am receiving an error.

I have implemented the methods just as the post shows, and the first three work properly. The fourth one (HomeController_Delete_Action_Handler_Should_Redirect_If_Model_Successfully_Delete) gives this error: Could not find a parameter named 'controller' in the result's Values collection.

If I change the code to:

actual 
    .AssertActionRedirect() 
    .ToAction("Index");

it works properly, but I don't like the "magic string" in there and prefer to use the lambda method that the other poster used.

My controller method looks like this:

    [HttpPost]
    public ActionResult Delete(State model)
    {
        try
        {
            if( model == null )
            {
                return View( model );
            }

            _stateService.Delete( model );

            return RedirectToAction("Index");
        }
        catch
        {
            return View( model );
        }
    }

What am I doing wrong?