function testQueueing()
 {
     $client = new \Guzzle\Http\Client();
     $client->getCurlMulti()->getEventDispatcher()->addSubscriber(new ConnectionLimit(2));
     $queueings = 0;
     $client->getEventDispatcher()->addListener('request.queued', function ($event) use(&$queueings) {
         $queueings++;
     });
     $dequeueings = 0;
     $client->getEventDispatcher()->addListener('request.dequeued', function ($event) use(&$dequeueings) {
         $dequeueings++;
     });
     $requests = array($client->get()->setResponse(new Response(200), true), $client->get()->setResponse(new Response(200), true), $client->get()->setResponse(new Response(200), true), $client->get()->setResponse(new Response(200), true));
     foreach ($client->send($requests) as $response) {
         $this->assertEquals(200, $response->getStatusCode(), "Status code");
     }
     $this->assertEquals(2, $queueings, "Queueings");
     $this->assertEquals(2, $dequeueings, "Dequeueings");
 }