Behat ile emailde attachment olup olmadığını kontrol etmek

/**
* @param string $tag
*
* @Then /^an email with o:tag "([^"]*)" should contain attachments with PNG and DOC extensions$/
*
* @throws BehaviorException
*/
public function anEmailWithOTagShouldContainAttachmentsWithPngAndDocExtensions($tag)
{
   $extensions['png'] = null;
   $extensions['doc'] = null;

   $messages = $this->getAllSentMessages();
   foreach ($messages as $message) {
       $headers = $message->getHeaders();
       if ($headers->has('o:tag')) {
           /** @var Swift_Mime_Headers_UnstructuredHeader $oTagHeader */
           $oTagHeader = $headers->get('o:tag');
           $oTags = (array) $oTagHeader->getValue();
           if (in_array($tag, $oTags)) {
               foreach ($message->getChildren() as $child) {
                   $attachment = str_replace(
                           'attachment; filename=',
                           null,
                           $child->getHeaders()->get('content-disposition')->getFieldBody()
                   );

                   if (array_key_exists(pathinfo($attachment, PATHINFO_EXTENSION), $extensions)) {
                       unset($extensions[pathinfo($attachment, PATHINFO_EXTENSION)]);
                   }
               }
           }
       }
   }

   if ($extensions) {
       throw new BehaviorException('Attachment with relevant extensions cannot be found.');
   }
}