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diff --git a/web/core/modules/system/tests/modules/early_rendering_controller_test/src/TestDomainObjectViewSubscriber.php b/web/core/modules/system/tests/modules/early_rendering_controller_test/src/TestDomainObjectViewSubscriber.php
new file mode 100644
index 000000000..e6152ca67
--- /dev/null
+++ b/web/core/modules/system/tests/modules/early_rendering_controller_test/src/TestDomainObjectViewSubscriber.php
@@ -0,0 +1,46 @@
+<?php
+
+namespace Drupal\early_rendering_controller_test;
+
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * View subscriber for turning TestDomainObject objects into Response objects.
+ */
+class TestDomainObjectViewSubscriber implements EventSubscriberInterface {
+
+  /**
+   * Sets a response given a TestDomainObject instance.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent $event
+   *   The event to process.
+   */
+  public function onViewTestDomainObject(GetResponseForControllerResultEvent $event) {
+    $result = $event->getControllerResult();
+
+    if ($result instanceof TestDomainObject) {
+      if ($result instanceof AttachmentsTestDomainObject) {
+        $event->setResponse(new AttachmentsTestResponse('AttachmentsTestDomainObject'));
+      }
+      elseif ($result instanceof CacheableTestDomainObject) {
+        $event->setResponse(new CacheableTestResponse('CacheableTestDomainObject'));
+      }
+      else {
+        $event->setResponse(new Response('TestDomainObject'));
+      }
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events[KernelEvents::VIEW][] = ['onViewTestDomainObject'];
+
+    return $events;
+  }
+
+}