public function setUp()
{
$this->dm = $this->createDocumentManager();
$class = $this->dm->getClassMetadata('Doctrine\\Tests\\Models\\CMS\\CmsUser');
$class->associationsMappings['groups']['cascade'] = ClassMetadata::CASCADE_PERSIST;
$class = $this->dm->getClassMetadata('Doctrine\\Tests\\Models\\CMS\\CmsGroup');
$class->associationsMappings['users']['cascade'] = ClassMetadata::CASCADE_PERSIST;
$class = $this->dm->getClassMetadata('Doctrine\\Tests\\Models\\CMS\\CmsArticle');
$class->associationsMappings['user']['cascade'] = ClassMetadata::CASCADE_PERSIST;
}