Swift_Attachment::newInstance PHP Méthode

    public static function newInstance($data = null, $filename = null, $contentType = null)
    {
        return new self($data, $filename, $contentType);
    }

 public function testSend()
 {
     $message = new Swift_Message();
     $message->setFrom('*****@*****.**', 'Johnny #5');
     $message->setSubject('Is alive!');
     $message->addTo('*****@*****.**', 'A. Friend');
     $message->addTo('*****@*****.**');
     $message->addCc('*****@*****.**');
     $message->addCc('*****@*****.**', 'Extra 2');
     $message->addBcc('*****@*****.**');
     $message->addBcc('*****@*****.**', 'Extra 4');
     $message->addPart('<q>Help me Rhonda</q>', 'text/html');
     $message->addPart('Doo-wah-ditty.', 'text/plain');
     $attachment = Swift_Attachment::newInstance('This is the plain text attachment.', 'hello.txt', 'text/plain');
     $attachment2 = Swift_Attachment::newInstance('This is the plain text attachment.', 'hello.txt', 'text/plain');
     $attachment2->setDisposition('inline');
     $message->attach($attachment);
     $message->attach($attachment2);
     $message->setPriority(1);
     $headers = $message->getHeaders();
     $headers->addTextHeader('X-PM-Tag', 'movie-quotes');
     $messageId = $headers->get('Message-ID')->getId();
     $transport = new PostmarkTransportStub('TESTING_SERVER');
     $client = $this->getMock('GuzzleHttp\\Client', array('request'));
     $transport->setHttpClient($client);
     $o = PHP_OS;
     $v = phpversion();
     $client->expects($this->once())->method('request')->with($this->equalTo('POST'), $this->equalTo('https://api.postmarkapp.com/email'), $this->equalTo(['headers' => ['X-Postmark-Server-Token' => 'TESTING_SERVER', 'User-Agent' => "swiftmailer-postmark (PHP Version: {$v}, OS: {$o})", 'Content-Type' => 'application/json'], 'json' => ['From' => '"Johnny #5" <*****@*****.**>', 'To' => '"A. Friend" <*****@*****.**>,[email protected]', 'Cc' => '[email protected],"Extra 2" <*****@*****.**>', 'Bcc' => '[email protected],"Extra 4" <*****@*****.**>', 'Subject' => 'Is alive!', 'Tag' => 'movie-quotes', 'TextBody' => 'Doo-wah-ditty.', 'HtmlBody' => '<q>Help me Rhonda</q>', 'Headers' => [['Name' => 'Message-ID', 'Value' => '<' . $messageId . '>'], ['Name' => 'X-PM-KeepID', 'Value' => 'true'], ['Name' => 'X-Priority', 'Value' => '1 (Highest)']], 'Attachments' => [['ContentType' => 'text/plain', 'Content' => 'VGhpcyBpcyB0aGUgcGxhaW4gdGV4dCBhdHRhY2htZW50Lg==', 'Name' => 'hello.txt'], ['ContentType' => 'text/plain', 'Content' => 'VGhpcyBpcyB0aGUgcGxhaW4gdGV4dCBhdHRhY2htZW50Lg==', 'Name' => 'hello.txt', 'ContentID' => 'cid:' . $attachment2->getId()]]]]));
     $transport->send($message);
 }