public function testRequiredClassesInvalidChildren()
{
$articleFolder = new CmsArticleFolder();
$articleFolder->id = '/functional/articles';
$article = new CmsGroup();
$article->id = '/functional/articles/address';
$article->name = 'invalid-child';
$this->dm->persist($articleFolder);
$this->dm->persist($article);
$this->dm->flush();
}