public function testLoadingParentClass()
{
$document = new HeadlineArticle();
$document->topic = 'Superclass test';
$document->headline = 'test test test';
$this->dm->persist($document);
$this->dm->flush();
$id = $document->id;
$this->dm->clear();
$doc = $this->dm->find('Doctrine\\Tests\\Models\\Mapping\\HeadlineArticle', $id);
$this->assertInstanceOf('\\Doctrine\\Tests\\Models\\Mapping\\HeadlineArticle', $doc);
$this->assertEquals('test test test', $doc->headline);
$this->assertEquals('Superclass test', $doc->topic);
}