public function test_add_meta_box_with_previously_removed_box_and_sorted_priority() {
    global $wp_meta_boxes;

    // Add a meta box to remove.
    add_meta_box( 'testbox1', 'Test Metabox', '__return_false', $current_screen = 'post' );

    // Remove the meta box.
    remove_meta_box( 'testbox1', $current_screen, 'advanced' );

    // Attempt to re-add the meta box with the 'sorted' priority.
    add_meta_box( 'testbox1', null, null, $current_screen, 'advanced', 'sorted' );

    // Check that the meta box was not re-added.
    $this->assertFalse( $wp_meta_boxes[ $current_screen ]['advanced']['default']['testbox1'] );
  }