public function testMergeKnownDocument()
{
$user = new CmsUser();
$user->username = "beberlei";
$user->name = "Benjamin";
$this->dm->persist($user);
$this->dm->flush();
$this->dm->clear();
$mergedUser = $this->dm->merge($user);
$this->assertNotSame($mergedUser, $user);
$this->assertSame($mergedUser->id, $user->id);
}