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

    public function onKernelRequest(GetResponseEvent $event)
    {
        $request = $event->getRequest();
        if (!$this->hasAuthenticatedBackendUser($request)) {
            return;
        }
        $request->attributes->set($this->requestAttribute, true);
    }

 /**
  * Tests that the request attribute is not set if there is no back end user.
  */
 public function testWithoutBackendUser()
 {
     $event = new GetResponseEvent($this->mockKernel(), new Request(), HttpKernelInterface::MASTER_REQUEST);
     $listener = new BypassMaintenanceListener($this->mockSession(), false);
     $listener->onKernelRequest($event);
     $this->assertFalse($event->getRequest()->attributes->has('_bypass_maintenance'));
 }