/**
  * @covers WPSEO_Twitter::twitter_title
  */
 public function test_twitter_title()
 {
     // create and go to post
     $post_id = $this->factory->post->create();
     $this->go_to(get_permalink($post_id));
     $expected = $this->metatag('title', self::$class_instance->title(''));
     self::$class_instance->twitter_title();
     $this->expectOutput($expected);
 }