Issue #3020579 by catch: TypeError: Argument 3 passed to Symfony\Component\HttpKernel\Event\FilterResponseEvent::__construct() must be of the type integer, string given [Symfony 4]

(cherry picked from commit 96ef995)

Author: alexpott

tests/Drupal/Tests/Core/EventSubscriber/RssResponseRelativeUrlFilterTest.php

@@ -114,7 +114,7 @@ public function testOnResponse($content, $expected_content) {
     $event = new FilterResponseEvent(
       $this->prophesize(HttpKernelInterface::class)->reveal(),
       Request::create('/'),
-      'foo',
+      HttpKernelInterface::MASTER_REQUEST,
       new Response($content, 200, [
         'Content-Type' => 'application/rss+xml',
       ])