module ActionDispatch::Assertions::RoutingAssertions

def create_routes
  @routes = ActionDispatch::Routing::RouteSet.new
  if defined?(@controller) && @controller
    @controller = @controller.clone
    _routes = @routes
    @controller.singleton_class.include(_routes.url_helpers)
    if @controller.respond_to? :view_context_class
      view_context_class = Class.new(@controller.view_context_class) do
        include _routes.url_helpers
      end
      custom_view_context = Module.new {
        define_method(:view_context_class) do
          view_context_class
        end
      }
      @controller.extend(custom_view_context)
    end
  end
  yield @routes
end