private function createEvent(\Exception $exception, $kernel = null)
 {
     if (null === $kernel) {
         $kernel = $this->getMock('Symfony\\Component\\HttpKernel\\HttpKernelInterface');
     }
     $event = new GetResponseForExceptionEvent($kernel, Request::create('/'), HttpKernelInterface::MASTER_REQUEST, $exception);
     $dispatcher = $this->getMock('Symfony\\Component\\EventDispatcher\\EventDispatcherInterface');
     $event->setDispatcher($dispatcher);
     return $event;
 }