public function testBackendException()
{
/** @var \Twig_Environment $twig */
$twig = $this->getMockBuilder('Twig_Environment')->setConstructorArgs([$this->getMock('Twig_LoaderInterface')])->getMock();
/** @var LoggerInterface $logger */
$logger = $this->getMock('Psr\\Log\\LoggerInterface');
$this->listener = new PrettyErrorScreenListener(true, $twig, $this->mockContaoFramework(), $this->mockTokenStorage('Contao\\BackendUser'), $logger);
$event = new GetResponseForExceptionEvent($this->mockKernel(), new Request(), HttpKernelInterface::MASTER_REQUEST, new InternalServerErrorHttpException('', new InternalServerErrorException()));
$this->listener->onKernelException($event);
$this->assertTrue($event->hasResponse());
$response = $event->getResponse();
$this->assertInstanceOf('Symfony\\Component\\HttpFoundation\\Response', $response);
$this->assertEquals(500, $response->getStatusCode());
}