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

    $prev_theme_nav_menu_locations = array(
      'main'      => 1,
      'secondary' => 2,
      'tertiary'  => 3,
    );

    $old_next_theme_nav_menu_locations = array();
    $new_next_theme_nav_menu_locations = wp_map_nav_menu_locations( $old_next_theme_nav_menu_locations, $prev_theme_nav_menu_locations );

    $expected_nav_menu_locations = array(
      'primary' => 1,
    );
    $this->assertSameSets( $expected_nav_menu_locations, $new_next_theme_nav_menu_locations );
  }