trait NodeCommentCombinationTrait in Drupal 8

trait NodeCommentCombinationTrait {

  /**
   * Creates a node type with a corresponding comment type.
   *
   * @param string $node_type
   *   The node type ID.
   * @param string $comment_type
   *   (optional) The comment type ID, if not provided defaults to
   *   comment_node_{type}.
   */
  protected function createNodeCommentCombination($node_type, $comment_type = NULL) {
    @trigger_error('NodeCommentCombinationTrait::createNodeCommentCombination() is deprecated in Drupal 8.7.x, will be removed before Drupal 9.0.0. Use \\Drupal\\Tests\\migrate_drupal\\Kernel\\d7\\MigrateDrupal7TestBase::migrateFields() instead.', E_USER_DEPRECATED);
    if (!$comment_type) {
      $comment_type = "comment_node_{$node_type}";
    }
    NodeType::create([
      'type' => $node_type,
      'label' => $this
        ->randomString(),
    ])
      ->save();
    CommentType::create([
      'id' => $comment_type,
      'label' => $this
        ->randomString(),
      'target_entity_type_id' => 'node',
    ])
      ->save();
  }

}