this fails: No route matches "/foos/1/bars"

my_spec.rb

require 'spec_helper'

module ActionDispatch::Routing
  
  describe Mapper do
    context "#my_method_that_modifies_routes", :type => :routing do
      
      
      before do
        # do some stuff that alters the routes
        Rails.application.reload_routes!
        @foo = Factory(:foo)
      end


      
      it "adds the route" do
        Rails.application.routes.routes.map(&:name).should include 'foo_bars' # passes, so this should work
        {:get => "/foos/#{@foo.id}/bars"}.should route_to(:controller => 'bars', :etc => 'etc') # fails: No route matches "/foos/1/bars"
      end
      



      after do
        # undo what we've done and reload routes
        Rails.application.reload_routes!
      end
      
    end
  end
end