protected function setUp()
 {
     parent::setUp();
     // Create a new content type
     $content_type = $this->drupalCreateContentType();
     // Add a node of the new content type.
     $node_data = array('type' => $content_type->id());
     $this->addDefaultCommentField('node', $content_type->id());
     $this->node = $this->drupalCreateNode($node_data);
     // Force a flush of the in-memory storage.
     $this->container->get('views.views_data')->clear();
     // Create some comments and attach them to the created node.
     for ($i = 0; $i < $this->masterDisplayResults; $i++) {
         /** @var \Drupal\comment\CommentInterface $comment */
         $comment = Comment::create(array('status' => CommentInterface::PUBLISHED, 'field_name' => 'comment', 'entity_type' => 'node', 'entity_id' => $this->node->id()));
         $comment->setOwnerId(0);
         $comment->setSubject('Test comment ' . $i);
         $comment->comment_body->value = 'Test body ' . $i;
         $comment->comment_body->format = 'full_html';
         // Ensure comments are sorted in ascending order.
         $time = REQUEST_TIME + ($this->masterDisplayResults - $i);
         $comment->setCreatedTime($time);
         $comment->changed->value = $time;
         $comment->save();
     }
     // Store all the nodes just created to access their properties on the tests.
     $this->commentsCreated = Comment::loadMultiple();
     // Sort created comments in descending order.
     ksort($this->commentsCreated, SORT_NUMERIC);
 }