Resolve #2795567 "Allow Symfony dump() to work in kernel and browser tests"

Closes #2795567

core/modules/system/tests/modules/test_page_test/src/Controller/TestPageTestController.php

@@ -2,6 +2,8 @@
 
 namespace Drupal\test_page_test\Controller;
 
+use Drupal\user\Entity\Role;
+
 /**
  * Controller routines for test_page_test routes.
  */
@@ -23,4 +25,16 @@ public function testPage() {
     ];
   }
 
+  /**
+   * Returns a test page and with the call to the dump() method.
+   */
+  public function testPageVarDump() {
+    $role = Role::create(['id' => 'test_role']);
+    dump($role);
+    return [
+      '#title' => t('Test page with var dump'),
+      '#markup' => t('Test page text.'),
+    ];
+  }
+
 }