app.get is using the same facility as integration testing (https://github.com/rails/rails/blob/master/actionpack/lib/ac...).

Check out the code that instantiates it at https://github.com/rails/rails/blob/master/railties/lib/rail...

I needed this in a rake task under Rails 2 a while back; I ended up doing the following:

  require 'action_controller/integration'
  app = ActionController::Integration::Session.new

  module CurrentUserHack
    def current_user 
      @user ||= User.look_up_my_user_here
    end
  end
  ApplicationController.send :include, CurrentUserHack

Now you can make authenticated requests in rake tasks and presumably in script/runner.