public function testUpdateAttachment()
{
$fh = fopen(__DIR__ . '/_files/foo.txt', 'r');
$user = $this->dm->find('Doctrine\\Tests\\Models\\CMS\\CmsUser', 'user_with_attachment');
$user->attachments['foo.txt'] = Attachment::createFromBinaryData($fh, 'text/plain');
$this->dm->flush();
$this->dm->clear();
// dont re-use identity map
$user = $this->dm->find('Doctrine\\Tests\\Models\\CMS\\CmsUser', 'user_with_attachment');
$this->assertEquals('Hello i am a string!', $user->attachments['foo.txt']->getRawData());
}