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diff --git a/web/core/modules/comment/tests/src/Functional/CommentNewIndicatorTest.php b/web/core/modules/comment/tests/src/Functional/CommentNewIndicatorTest.php
new file mode 100644
index 000000000..69f7bdeee
--- /dev/null
+++ b/web/core/modules/comment/tests/src/Functional/CommentNewIndicatorTest.php
@@ -0,0 +1,137 @@
+<?php
+
+namespace Drupal\Tests\comment\Functional;
+
+use Drupal\Component\Serialization\Json;
+use Drupal\Core\Language\LanguageInterface;
+use Drupal\comment\CommentInterface;
+use Drupal\Core\Url;
+use Drupal\comment\Entity\Comment;
+
+/**
+ * Tests the 'new' indicator posted on comments.
+ *
+ * @group comment
+ */
+class CommentNewIndicatorTest extends CommentTestBase {
+
+  /**
+   * Use the main node listing to test rendering on teasers.
+   *
+   * @var array
+   *
+   * @todo Remove this dependency.
+   */
+  public static $modules = ['views'];
+
+  /**
+   * Get node "x new comments" metadata from the server for the current user.
+   *
+   * @param array $node_ids
+   *   An array of node IDs.
+   *
+   * @return \Psr\Http\Message\ResponseInterface
+   *   The HTTP response.
+   */
+  protected function renderNewCommentsNodeLinks(array $node_ids) {
+    $client = $this->getHttpClient();
+    $url = Url::fromRoute('comment.new_comments_node_links');
+
+    return $client->request('POST', $this->buildUrl($url), [
+      'cookies' => $this->getSessionCookies(),
+      'http_errors' => FALSE,
+      'form_params' => [
+        'node_ids' => $node_ids,
+        'field_name' => 'comment',
+      ],
+    ]);
+  }
+
+  /**
+   * Tests new comment marker.
+   */
+  public function testCommentNewCommentsIndicator() {
+    // Test if the right links are displayed when no comment is present for the
+    // node.
+    $this->drupalLogin($this->adminUser);
+    $this->drupalGet('node');
+    $this->assertNoLink(t('@count comments', ['@count' => 0]));
+    $this->assertLink(t('Read more'));
+    // Verify the data-history-node-last-comment-timestamp attribute, which is
+    // used by the drupal.node-new-comments-link library to determine whether
+    // a "x new comments" link might be necessary or not. We do this in
+    // JavaScript to prevent breaking the render cache.
+    $this->assertIdentical(0, count($this->xpath('//*[@data-history-node-last-comment-timestamp]')), 'data-history-node-last-comment-timestamp attribute is not set.');
+
+    // Create a new comment. This helper function may be run with different
+    // comment settings so use $comment->save() to avoid complex setup.
+    /** @var \Drupal\comment\CommentInterface $comment */
+    $comment = Comment::create([
+      'cid' => NULL,
+      'entity_id' => $this->node->id(),
+      'entity_type' => 'node',
+      'field_name' => 'comment',
+      'pid' => 0,
+      'uid' => $this->loggedInUser->id(),
+      'status' => CommentInterface::PUBLISHED,
+      'subject' => $this->randomMachineName(),
+      'hostname' => '127.0.0.1',
+      'langcode' => LanguageInterface::LANGCODE_NOT_SPECIFIED,
+      'comment_body' => [LanguageInterface::LANGCODE_NOT_SPECIFIED => [$this->randomMachineName()]],
+    ]);
+    $comment->save();
+    $this->drupalLogout();
+
+    // Log in with 'web user' and check comment links.
+    $this->drupalLogin($this->webUser);
+    $this->drupalGet('node');
+    // Verify the data-history-node-last-comment-timestamp attribute. Given its
+    // value, the drupal.node-new-comments-link library would determine that the
+    // node received a comment after the user last viewed it, and hence it would
+    // perform an HTTP request to render the "new comments" node link.
+    $this->assertIdentical(1, count($this->xpath('//*[@data-history-node-last-comment-timestamp="' . $comment->getChangedTime() . '"]')), 'data-history-node-last-comment-timestamp attribute is set to the correct value.');
+    $this->assertIdentical(1, count($this->xpath('//*[@data-history-node-field-name="comment"]')), 'data-history-node-field-name attribute is set to the correct value.');
+    // The data will be pre-seeded on this particular page in drupalSettings, to
+    // avoid the need for the client to make a separate request to the server.
+    $settings = $this->getDrupalSettings();
+    $this->assertEqual($settings['history'], ['lastReadTimestamps' => [1 => 0]]);
+    $this->assertEqual($settings['comment'], [
+      'newCommentsLinks' => [
+        'node' => [
+          'comment' => [
+            1 => [
+              'new_comment_count' => 1,
+              'first_new_comment_link' => Url::fromRoute('entity.node.canonical', ['node' => 1])->setOptions([
+                'fragment' => 'new',
+              ])->toString(),
+            ],
+          ],
+        ],
+      ],
+    ]);
+    // Pretend the data was not present in drupalSettings, i.e. test the
+    // separate request to the server.
+    $response = $this->renderNewCommentsNodeLinks([$this->node->id()]);
+    $this->assertSame(200, $response->getStatusCode());
+    $json = Json::decode($response->getBody());
+    $expected = [
+      $this->node->id() => [
+        'new_comment_count' => 1,
+        'first_new_comment_link' => $this->node->url('canonical', ['fragment' => 'new']),
+      ],
+    ];
+    $this->assertIdentical($expected, $json);
+
+    // Failing to specify node IDs for the endpoint should return a 404.
+    $response = $this->renderNewCommentsNodeLinks([]);
+    $this->assertSame(404, $response->getStatusCode());
+
+    // Accessing the endpoint as the anonymous user should return a 403.
+    $this->drupalLogout();
+    $response = $this->renderNewCommentsNodeLinks([$this->node->id()]);
+    $this->assertSame(403, $response->getStatusCode());
+    $response = $this->renderNewCommentsNodeLinks([]);
+    $this->assertSame(403, $response->getStatusCode());
+  }
+
+}