public function testUploadablePropertyInMiddleClassInInheritanceTree()
 {
     $event = new Event();
     $event->setCoverImage(new \SplFileInfo(TESTS_PATH . self::TEST_FILE1));
     $event->setColumn1('column 1');
     $event->setColumn2('column 2');
     $event->setTitle('title');
     $event->setExcerpt('excerpt');
     $this->_em->persist($event);
     $this->_em->flush();
     $this->_em->clear();
     $event = $this->_em->find(self::EVENT_PAGE, $event->getId());
     $event->setCoverImage(new \SplFileInfo(TESTS_PATH . self::TEST_FILE2));
     $this->_em->flush();
     $this->_em->clear();
 }