Add routes outside of routes.draw

routes.rb

# Unfortunately, you still have to create the routes somewhere in routes.rb

Your::Application.routes.draw do
  root :to => 'controller#action'
end

mapper = ActionDispatch::Routing::Mapper.new(Rails.application.routes)
mapper.instance_exec do
  match '/some/action' => "some#action"
end

Hey, there. I came across this gist when trying to add a new route. Basically, I want to add a route that is only used in test environment and thought this would be perfect. However, when I tried it didn't work (rails 3.0.9)

Inside

RouteSet#add_route

the variable

@valid_conditions

Is set to nil when the routeset is frozen. Any ideas if it is possible to unfreeze it. Or will I need to reinitialize? Thanks in advance