public function tearDown()
 {
     parent::tearDown();
     $this->em->clear();
     $this->em->close();
     foreach ($this->dataFiles() as $src => $dst) {
         $path = self::DSTDIR . '/' . $dst;
         if (file_exists($path)) {
             if (is_dir($path)) {
                 $this->delTree($path);
             } else {
                 unlink($path);
             }
         }
     }
 }