public function tearDown()
{
if ($this->pdo instanceof PDO) {
$this->pdo->query("DROP TABLE IF EXISTS imageinfo");
$this->pdo->query("DROP TABLE IF EXISTS metadata");
$this->pdo->query("DROP TABLE IF EXISTS shorturl");
$this->pdo->query("DROP INDEX IF EXISTS shorturlparams");
}
$this->pdo = null;
parent::tearDown();
}