class ActionDispatch::Routing::RouteSet::NamedRouteCollection

def clear!
  @path_helpers.each do |helper|
    @path_helpers_module.remove_method helper
  end
  @url_helpers.each do |helper|
    @url_helpers_module.remove_method helper
  end
  @routes.clear
  @path_helpers.clear
  @url_helpers.clear
end