Contao\CoreBundle\EventListener\InsecureInstallationListener::onKernelRequest PHP Method

    public function onKernelRequest(GetResponseEvent $event)
    {
        $request = $event->getRequest();
        // Skip the check on localhost
        if (in_array($request->getClientIp(), $this->localIps)) {
            return;
        }
        // The document root does not contain /web
        if ('/web' !== substr($request->getBasePath(), -4)) {
            return;
        }
        throw new InsecureInstallationException('Your installation is not secure. Please set the document root to the /web subfolder.');
    }

 /**
  * Tests the onKernelRequest() method with a secure document root.
  */
 public function testOnKernelRequestWithSecureDocumentRoot()
 {
     $kernel = $this->mockKernel();
     $request = $this->getRequestObject();
     $request->server->set('REQUEST_URI', '/app_dev.php?do=test');
     $request->server->set('SCRIPT_FILENAME', $this->getRootDir() . '/app_dev.php');
     $event = new GetResponseEvent($kernel, $request, Kernel::MASTER_REQUEST);
     $listener = new InsecureInstallationListener();
     $listener->onKernelRequest($event);
 }