You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: controller_helpers.rb
    path of file: ./repos/devise/lib/devise/test
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module Devise
  module Test
    # `Devise::Test::ControllerHelpers` provides a facility to test controllers
    # in isolation when using `ActionController::TestCase` allowing you to
    # quickly sign_in or sign_out a user. Do not use
    # `Devise::Test::ControllerHelpers` in integration tests.
    #
    # Examples
    #
    #  class PostsTest < ActionController::TestCase
    #    include Devise::Test::ControllerHelpers
    #
   
    
      def _catch_warden(&block)
        result = catch(:warden, &block)

        env = @controller.request.env

        result ||= {}

        # Set the response. In production, the rack result is returned
        # from Warden::Manager#call, which the following is modelled on.
        case result
        when Array
          if result.first == 401 && intercept_401?(env) # does this happen during testing?
            _process_unauthenticated(env)
          else
            result
          end
        when Hash
          _process_unauthenticated(env, result)
        else
          result
        end