View source  
  <?php
namespace Drupal\Tests\Core\EventSubscriber;
use Drupal\Core\Cache\CacheableJsonResponse;
use Drupal\Core\Cache\CacheableMetadata;
use Drupal\Core\EventSubscriber\ExceptionJsonSubscriber;
use Drupal\Core\Http\Exception\CacheableMethodNotAllowedHttpException;
use Drupal\Tests\UnitTestCase;
use Symfony\Component\HttpFoundation\JsonResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
use Symfony\Component\HttpKernel\Exception\HttpExceptionInterface;
use Symfony\Component\HttpKernel\Exception\MethodNotAllowedHttpException;
use Symfony\Component\HttpKernel\HttpKernelInterface;
class ExceptionJsonSubscriberTest extends UnitTestCase {
  
  public function testOn4xx(HttpExceptionInterface $exception, $expected_response_class) {
    $kernel = $this
      ->prophesize(HttpKernelInterface::class);
    $request = Request::create('/test');
    $event = new GetResponseForExceptionEvent($kernel
      ->reveal(), $request, HttpKernelInterface::MASTER_REQUEST, $exception);
    $subscriber = new ExceptionJsonSubscriber();
    $subscriber
      ->on4xx($event);
    $response = $event
      ->getResponse();
    $this
      ->assertInstanceOf($expected_response_class, $response);
    $this
      ->assertEquals('{"message":"test message"}', $response
      ->getContent());
    $this
      ->assertEquals(405, $response
      ->getStatusCode());
    $this
      ->assertEquals('POST, PUT', $response->headers
      ->get('Allow'));
    $this
      ->assertEquals('application/json', $response->headers
      ->get('Content-Type'));
  }
  public function providerTestOn4xx() {
    return [
      'uncacheable exception' => [
        new MethodNotAllowedHttpException([
          'POST',
          'PUT',
        ], 'test message'),
        JsonResponse::class,
      ],
      'cacheable exception' => [
        new CacheableMethodNotAllowedHttpException((new CacheableMetadata())
          ->setCacheContexts([
          'route',
        ]), [
          'POST',
          'PUT',
        ], 'test message'),
        CacheableJsonResponse::class,
      ],
    ];
  }
}