reverted:
--- b/core/modules/comment/src/Tests/CommentEmptyTitlesTest.php
+++ /dev/null
@@ -1,56 +0,0 @@
-<?php
-
-/**
- * @file
- * Definition of Drupal\comment\Tests\CommentEmptyTitlesTest.
- */
-
-namespace Drupal\comment\Tests;
-
-use Drupal\Core\Language\Language;
-
-/**
- * Tests comment with empty titles.
- */
-class CommentEmptyTitlesTest extends CommentTestBase {
-  public static function getInfo() {
-    return array(
-      'name' => 'Comment empty titles',
-      'description' => 'Test to ensure that appropriate and accessible markup is used when comments are created without titles.',
-      'group' => 'Comment',
-    );
-  }
-
-  /**
-   * Enables module that sets comments to = ''.
-   */
-  public static $modules = array('comment_test');
-
-  /**
-   * Tests markup for comments with empty titles.
-   */
-  function testCommentEmptyTitles () {
-    // Set comments to have a subject with preview disabled.
-    $this->drupalLogin($this->admin_user);
-    $this->setCommentPreview(DRUPAL_DISABLED);
-    $this->setCommentForm(TRUE);
-    $this->setCommentSubject(TRUE);
-    $this->drupalLogout();
-
-    // Create a node.
-    $this->drupalLogin($this->web_user);
-    $this->node = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'uid' => $this->web_user->id()));
-
-    // Post comment #1 and verify that title is rendered in h3.
-    $this->drupalLogin($this->web_user);
-    $subject_text = $this->randomName();
-    $comment_text = $this->randomName();
-    $comment1 = $this->postComment($this->node, $comment_text, $subject_text, TRUE);
-    // Confirm that the comment was created.
-    $this->assertTrue($this->commentExists($comment1), 'Comment #1. Comment found.');
-    // Tests that markup is created for comment with heading.
-    $this->assertNoPattern('|<h3[^>]*><a href="drupal/comment/[^>]*></a></h3>|', 'H3 for comment title element found when no title present.');
-
-  }
-
-}
reverted:
--- b/core/modules/comment/src/Tests/CommentPopulatedTitlesTest.php
+++ /dev/null
@@ -1,51 +0,0 @@
-<?php
-
-/**
- * @file
- * Definition of Drupal\comment\Tests\CommentPopulatedTitleTest.
- */
-
-namespace Drupal\comment\Tests;
-
-use Drupal\Core\Language\Language;
-
-/**
- * Tests populated comment titles.
- */
-class CommentPopulatedTitlesTest extends CommentTestBase {
-  public static function getInfo() {
-    return array(
-      'name' => 'Comment populated titles',
-      'description' => 'Test to ensure that appropriate and accessible markup is used when comments are created with titles.',
-      'group' => 'Comment',
-    );
-  }
-
-  /**
-   * Tests markup for comments with empty titles.
-   */
-  function testCommentPopulatedTitles () {
-    // Set comments to have a subject with preview disabled.
-    $this->drupalLogin($this->admin_user);
-    $this->setCommentPreview(DRUPAL_DISABLED);
-    $this->setCommentForm(TRUE);
-    $this->setCommentSubject(TRUE);
-    $this->drupalLogout();
-
-    // Create a node.
-    $this->drupalLogin($this->web_user);
-    $this->node = $this->drupalCreateNode(array('type' => 'article', 'promote' => 1, 'uid' => $this->web_user->id()));
-
-    // Post comment #1 and verify that title is rendered in h3.
-    $this->drupalLogin($this->web_user);
-    $subject_text = $this->randomName();
-    $comment_text = $this->randomName();
-    $comment1 = $this->postComment($this->node, $comment_text, $subject_text, TRUE);
-    // Confirm that the comment was created.
-    $this->assertTrue($this->commentExists($comment1), 'Comment #1. Comment found.');
-    // Tests that markup is created for comment with heading.
-    $this->assertPattern('|<h3[^>]*><a[^>]*>' . $subject_text . '</a></h3>|', 'H3 element not found when title present.');
-
-  }
-
-}
reverted:
--- b/core/modules/comment/tests/modules/comment_test_empty_titles/comment_test_empty_titles.info.yml
+++ /dev/null
@@ -1,8 +0,0 @@
-name: 'Comment test empty titles'
-type: module
-description: 'Support module for testing empty title accessibility with Comment module.'
-package: Testing
-version: VERSION
-core: 8.x
-dependencies:
-  - comment
\ No newline at end of file
reverted:
--- b/core/modules/comment/tests/modules/comment_test_empty_titles/comment_test_empty_titles.module
+++ /dev/null
@@ -1,16 +0,0 @@
-<?php
-
-/**
- * @file
- * Dummy module emptying comment titles to test for approriate and accessible
- * markup in edge case scenarios where comments have empty titles.
- */
-
-use Drupal\comment\CommentInterface;
-
-/**
- * Implements hook_preprocess_comment().
- */
-function comment_test_empty_titles_preprocess_comment(&$v) {
-    $v['title'] = '';
-}
\ No newline at end of file