public function doSetup($versionFileLocation, $upgradeConfigFile, Database $db = null, $rwDir = null, $lockFile = 'unittest_upgrade.lock')
 {
     if (is_null($rwDir) || !strlen($rwDir)) {
         $rwDir = dirname(__FILE__) . '/files/rw';
     }
     parent::__construct($versionFileLocation, $upgradeConfigFile, $db, $rwDir, $lockFile);
 }