laravel phpunit controller testing

<?php

require('test_helper.php');

abstract class ControllerTestCase extends PHPUnit_Framework_TestCase {

    public function call($destination, $parameters = array(), $method = 'GET') {

        \Laravel\Request::foundation()->server->add(array(
            'REQUEST_METHOD' => $method,
        ));

        return \Laravel\Routing\Controller::call($destination, $parameters);
    }
    /*
     * cleans the previous request so that the next request
     * wont get piled on and merged
     */
    private function clean_request(){
        $request = \Laravel\Request::foundation()->request;
        $req_keys = $request->keys();

        foreach($req_keys as $key){
            $request->remove($key);
        }
    }
    public function get($destination, $parameters = array()) {
        return $this->call($destination, $parameters, 'GET');
    }

    public function post($destination, $post_data, $parameters = array()) {
        $this->clean_request();
        \Laravel\Request::foundation()->request->add($post_data);

        return $this->call($destination, $parameters, 'POST');
    }

    public function put($destination, $put_data, $parameters = array()) {
        $this->clean_request();
        \Laravel\Request::foundation()->request->add($put_data);

        return $this->call($destination, $parameters, 'PUT');
    }

    public function delete($destination, $parameters = array()) {
        return $this->call($destination, $parameters, 'DELETE');
    }

}