private function _getClient($code = 200)
{
$response = new Horde_Http_Response_Mock('', fopen(__DIR__ . '/../../../fixtures/owa_freebusy.xml', 'r'));
$response->code = $code;
$request = new Horde_Http_Request_Mock();
$request->setResponse($response);
return new Horde_Http_Client(array('request' => $request));
}