public static function push($user, $templates, $context)
    {
        if (defined('IN_UNIT_TESTS')) {
            return;
        }
        foreach ($templates as $engineName => $template) {
            $engineClass = 'User_Notify_Engine_' . $engineName;
            $engine = new $engineClass();
            $engine->push($user, $template, $context);
        }
    }