private function _gen_authorize_ack()
{
$ack = new AuthorizeAckFrame();
$ack->status = 0;
$ack->num_pipelet = 10;
$ack->store();
$passed = $ack->buffer();
$ack->status = 10;
$ack->error_message = 'failed';
$ack->store();
$failed = $ack->buffer();
$bad_ack = new UninitMetaAckFrame();
$bad_ack->status = 0;
$bad_ack->store();
$bad = $bad_ack->buffer();
return array('passed' => $passed, 'failed' => $failed, 'bad' => $bad);
}
