Bolt\Twig\TwigExtension::slug PHP Method

    public function slug($str)
    {
        return $this->handlers['text']->slug($str);
    }

 public function testSlug()
 {
     $app = $this->getApp();
     $handlers = $this->getTwigHandlers($app);
     $handlers['text'] = $this->getMockHandler('TextHandler', 'slug');
     $twig = new TwigExtension($app, $handlers, true);
     $twig->slug(null);
 }