public function testTheHttpClientWillFallbackToDefault()
 {
     $client = new FacebookClient();
     $httpHandler = $client->getHttpClientHandler();
     if (function_exists('curl_init')) {
         $this->assertInstanceOf('Facebook\\HttpClients\\FacebookCurlHttpClient', $httpHandler);
     } else {
         $this->assertInstanceOf('Facebook\\HttpClients\\FacebookStreamHttpClient', $httpHandler);
     }
 }