cannot test a controller action for a route defined with match

Apparently, there is no easy way to test a route defined using the router's match helper.

Using rails 3.0, I define a route using match to catch several different feeds

/feed/google_base.xml /feed/custom.xml

etc.. Here is the code.

# route
B0rken::Application.routes.draw do
  match 'feed/:service(.xml)' => "/public/listings#feed", :format => :xml, :as => :feed
end

# controller
class Public::ListingsController < ApplicationController
  def feed
    render :xml => ["You just requested feed #{ params[:service] }"]
  end
end

# test
class Public::ListingsControllerTest < ActionController::TestCase
  test "should get a feed" do
    get "feed", :service => "google_base", :format => "xml"
    assert_response :success
  end
end

Even though I can rackup this rails3 controller and retrieve the feed w/o problem,
I cannot find a way to make the test retrieve the route.

I understand there might be better ways to define the route in this specific case, but,
If a route is valid, and I'm able to match it in the live rails app, and it returns the expected result,
then I think there should be away to test that controller action in my app test suite.