How to us actingAs() with Sentinel

I am testing a Laravel 5.1 page that requires the user to be logged in. My project uses the Cartalyst/Sentinel packing for authentication.

I tried this but I doesn't recognize that the user is logged in.

public function testPageWithLogin()
{
    $user = Sentinel::findById(2);

    $this->actingAs($user)
         ->withSession([])
         ->visit('/candidate/add')
         ->dontSee('Whoops')
         ->dontSee('login')
         ->see('List of Candidates');
}

What can I do so that the user will be seen as logged in?

via Chebli Mohamed