public function test_numerical_old_locations() {
    $this->register_nav_menu_locations( array( 'primary', 1 ) );

    $old_nav_menu_locations = array(
      'primary'  => 1,
      'tertiary' => 2,
      0          => 3,
    );

    $next_theme_nav_menu_locations     = array();
    $new_next_theme_nav_menu_locations = wp_map_nav_menu_locations( $next_theme_nav_menu_locations, $old_nav_menu_locations );

    $expected_nav_menu_locations = array(
      'primary' => 1,
      0         => 3,
    );

    $this->assertSameSets( $expected_nav_menu_locations, $new_next_theme_nav_menu_locations );
  }