Issue #3127250 by anmolgoyal74, joseph.olstad, ankithashetty, fago, catch, alexpott: Node previews are cached by dynamic page cache

core/modules/node/node.services.yml

@@ -40,6 +40,7 @@ services:
     public: false
     tags:
       - { name: page_cache_response_policy }
+      - { name: dynamic_page_cache_response_policy }
   cache_context.user.node_grants:
     class: Drupal\node\Cache\NodeAccessGrantsCacheContext
     arguments: ['@current_user']

core/modules/node/tests/src/Functional/PagePreviewTest.php

@@ -13,6 +13,7 @@ use Drupal\taxonomy\Entity\Term;
 use Drupal\taxonomy\Entity\Vocabulary;
 use Drupal\Tests\field\Traits\EntityReferenceTestTrait;
 use Drupal\Tests\TestFileCreationTrait;
+use Drupal\user\RoleInterface;
 
 /**
  * Tests the node entity preview functionality.
@@ -500,4 +501,27 @@ class PagePreviewTest extends NodeTestBase {
     $this->assertText($edit2[$title_key]);
   }
 
+  /**
+   * Tests node preview with dynamic_page_cache and anonymous users.
+   */
+  public function testPagePreviewCache() {
+    \Drupal::service('module_installer')->uninstall(['node_test']);
+    $this->drupalLogout();
+    $title_key = 'title[0][value]';
+    user_role_grant_permissions(RoleInterface::ANONYMOUS_ID, ['create page content', 'access content']);
+    $edit = [
+      $title_key => $this->randomMachineName(8),
+    ];
+    $this->drupalGet('/node/add/page');
+    $this->submitForm($edit, 'Preview');
+    $this->assertSession()->pageTextContains($edit[$title_key]);
+    $this->clickLink(t('Back to content editing'));
+
+    $edit = [
+      $title_key => $this->randomMachineName(8),
+    ];
+    $this->submitForm($edit, 'Preview');
+    $this->assertSession()->pageTextContains($edit[$title_key]);
+  }
+
 }