public function test_custom_type_label() {
    do_action( 'customize_register', $this->wp_customize );
    add_filter( 'wp_setup_nav_menu_item', array( $this, 'filter_type_label' ) );

    $menu_id = wp_create_nav_menu( 'Menu' );
    $item_id = wp_update_nav_menu_item(
      $menu_id,
      0,
      array(
        'menu-item-type'   => 'custom_type',
        'menu-item-object' => 'custom_object',
        'menu-item-title'  => 'Cool beans',
        'menu-item-status' => 'publish',
      )
    );

    $post      = get_post( $item_id );
    $menu_item = wp_setup_nav_menu_item( $post );

    $setting_id = "nav_menu_item[$item_id]";
    $setting    = new WP_Customize_Nav_Menu_Item_Setting( $this->wp_customize, $setting_id );

    $value = $setting->value();
    $this->assertSame( $menu_item->type_label, 'Custom Label' );
    $this->assertSame( $menu_item->type_label, $value['type_label'] );
  }