symfony - Download file functional test on Symfony2 -

with symfony2, how test (functional test) file has been downloaded on client's side? have tried following code wrong.

my controller:

public function downloadaction($picture_id)  {      $fichier= $this->uploaddir.$picture_id;      if (($fichier != "") && (file_exists($fichier))) {         $content = file_get_contents($fichier);          $response = new response();         $response->headers->set('content-type', 'application/octet-stream');         $response->headers->set('content-disposition', 'attachment;filename="'.$picture_id);          $response->setcontent($content);          return $response;     } } 

test code:

public function testupload() {          $ch = curl_init();                 curl_setopt($ch, curlopt_header, 0);                 //curl_setopt($ch, curlopt_httpheader, array("content-type: image/jpeg"));                 curl_setopt($ch, curlopt_verbose, 1);                 curl_setopt($ch, curlopt_returntransfer, true);                 curl_setopt($ch, curlopt_useragent, "mozilla/4.0 (compatible;)");                 curl_setopt($ch, curlopt_url, "path_to _myfile/file.png");                 //curl_setopt($ch, curlopt_post, true);                         $response = curl_exec($ch);                  //$json_response = json_decode($response);                  print "resp -> ".$response->headers;   } 

finally, response phpunit:

1) application\mediabundle\tests\controller\picturecontrollercopytest::testupload
trying property of non-object

/var/www/symfony/ws1/src/application/mediabundle/tests/controller/picturecontrollercopytest.php:28

failures! tests: 1, assertions: 0, errors: 1.

write functional test instead of using curl. advantage won't need web server run test, since kernel called directly (it's faster going through web server).

read on functional tests in docs: http://symfony.com/doc/current/book/testing.html#functional-tests