add_meta_box() public method

Adds the Yoast SEO meta box to the edit boxes in the edit post, page, attachment, and custom post types pages.
public add_meta_box ( )
 public function test_add_metabox()
 {
     global $wp_meta_boxes;
     self::$class_instance->add_meta_box();
     $post_types = get_post_types(array('public' => true));
     // test if all post types have the wpseo_meta metabox
     foreach ($post_types as $post_type) {
         $this->assertArrayHasKey('wpseo_meta', $wp_meta_boxes[$post_type]['normal']['high']);
     }
 }