private static function getSpyBaseCode()
    {
        if (empty(self::$baseClassCode)) {
            $spyBaseClassFile = dirname(__FILE__).'/SpyBase.php';
            self::$baseClassCode = new UnorderedList(file($spyBaseClassFile, FILE_IGNORE_NEW_LINES));
        }

        return self::$baseClassCode->toArray();
    }