public function testEmbeddedTag()
 {
     $tag = new Tag();
     $tag->setCod('tag');
     $tag1 = new Tag();
     $tag1->setCod('embeddedTag');
     $this->dm->persist($tag);
     $this->dm->persist($tag1);
     $this->dm->flush();
     $embeddedTag = new EmbeddedTag($tag);
     $embeddedTag->setCod('embeddedTag');
     $this->dm->persist($embeddedTag);
     $this->dm->flush();
     $this->assertTrue($embeddedTag->isDescendantOf($tag));
     $this->assertFalse($embeddedTag->isDescendantOf($tag1));
 }