ActionController master bug report template issue

action_controller_master.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'rails'
require 'action_controller/railtie'

class TestApp < Rails::Application
  config.root = File.dirname(__FILE__)
  config.session_store :cookie_store, key: 'cookie_store_key'
  config.secret_token    = 'secret_token'
  config.secret_key_base = 'secret_key_base'

  config.logger = Logger.new($stdout)
  Rails.logger  = config.logger

  routes.draw do
    resources :parents do
      resources :children
    end
  end
end

class ChildrenController < ActionController::Base
  def index
    render text: parent_children_path
  end
end

require 'minitest/autorun'
require 'rack/test'

class BugTest < Minitest::Test
  include Rack::Test::Methods

  def test_returns_success
    get '/parents/foo/children'
  end

  private
    def app
      Rails.application
    end
end

error

NameError (undefined local variable or method `parent_children_path' for #<ChildrenController:0x00000002885980>):
  action_controller_master.rb:34:in `index'