Bolt\Twig\TwigExtension::testStackable PHP Method

    public function testStackable($filename)
    {
        return $this->handlers['admin']->testStackable($filename);
    }

 public function testTestStackable()
 {
     $app = $this->getApp();
     $handlers = $this->getTwigHandlers($app);
     $handlers['admin'] = $this->getMockHandler('AdminHandler', 'testStackable');
     $twig = new TwigExtension($app, $handlers, true);
     $twig->testStackable(null);
 }