How to set locale default_url_options for functional tests (Rails)

Question

In my application_controller, I have the following set to include the locale with all paths generated by url_for:

  def default_url_options(options={})
    {         


        

Answer 1

Things changed again with Ruby 5.1. Here's what worked for me:

class ActionController::TestCase
  module Behavior
    module LocaleParameter
      def process(action, params: {}, **args)
        # Locale parameter must be a string
        params[:locale] = I18n.locale.to_s
        super(action, params: params, **args)
      end
    end
  end
  prepend Behavior::LocaleParameter
end