UnitTest middleware in Larave5

I have a small middle ware for which I would like to write a test for.. I would like to do two tests:

1. Mock role_id with 1; handle should return TRUE
2. Mock role_id with 2; handle should return FALSE

How can this be done?

namespace App\Http\Middleware;

use Closure;
use Auth;
use Redirect;

class RedirectIfNotAdminUser {

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     * @return mixed
     */
    public function handle($request, Closure $next) {
        if (Auth::user()->role_id != config('Roles.admin')) {
            return Redirect::action('Auth\AuthController@getLogin');
        }

        return $next($request);
    }

}

via Chebli Mohamed