Add railties to use zeitwerk

specs about autoload needs zeitwerk which raitlies depends on

ref https://github.com/willnet/delayed_job/runs/3856963931?check_suite_focus=true

Gemfile

@@ -37,7 +37,7 @@ platforms :jruby do
  elsif ENV['RAILS_VERSION']
  gem 'railties', "~> #{ENV['RAILS_VERSION']}"
  else
- gem 'railties', ['>= 3.0', '< 7.0']
+ gem 'railties', ['>= 3.0', '< 7.1']
  end
 end
 
@@ -49,12 +49,15 @@ group :test do
  if ENV['RAILS_VERSION'] == 'edge'
  gem 'actionmailer', :github => 'rails/rails'
  gem 'activerecord', :github => 'rails/rails'
+ gem 'railties', :github => 'rails/rails'
  elsif ENV['RAILS_VERSION']
  gem 'actionmailer', "~> #{ENV['RAILS_VERSION']}"
  gem 'activerecord', "~> #{ENV['RAILS_VERSION']}"
+ gem 'railties', "~> #{ENV['RAILS_VERSION']}"
  else
  gem 'actionmailer', ['>= 3.0', '< 7.1']
  gem 'activerecord', ['>= 3.0', '< 7.1']
+ gem 'railties', ['>= 3.0', '< 7.1']
  end
 
  gem 'rspec', '>= 3'

spec/delayed/command_spec.rb

@@ -159,16 +159,18 @@
  describe 'running worker pools defined by multiple --pool arguments' do
  it 'should run the correct worker processes' do
  command = Delayed::Command.new(['--pool=*:1', '--pool=test_queue:4', '--pool=mailers,misc:2'])
- expect(FileUtils).to receive(:mkdir_p).with('./tmp/pids').once
+ pid_dir = File.expand_path('./tmp/pids')
+ log_dir = File.expand_path('./log')
+ expect(FileUtils).to receive(:mkdir_p).with(pid_dir).once
 
  [
- ['delayed_job.0', {:quiet => true, :pid_dir => './tmp/pids', :log_dir => './log', :queues => []}],
- ['delayed_job.1', {:quiet => true, :pid_dir => './tmp/pids', :log_dir => './log', :queues => ['test_queue']}],
- ['delayed_job.2', {:quiet => true, :pid_dir => './tmp/pids', :log_dir => './log', :queues => ['test_queue']}],
- ['delayed_job.3', {:quiet => true, :pid_dir => './tmp/pids', :log_dir => './log', :queues => ['test_queue']}],
- ['delayed_job.4', {:quiet => true, :pid_dir => './tmp/pids', :log_dir => './log', :queues => ['test_queue']}],
- ['delayed_job.5', {:quiet => true, :pid_dir => './tmp/pids', :log_dir => './log', :queues => %w[mailers misc]}],
- ['delayed_job.6', {:quiet => true, :pid_dir => './tmp/pids', :log_dir => './log', :queues => %w[mailers misc]}]
+ ['delayed_job.0', {:quiet => true, :pid_dir => pid_dir, :log_dir => log_dir, :queues => []}],
+ ['delayed_job.1', {:quiet => true, :pid_dir => pid_dir, :log_dir => log_dir, :queues => ['test_queue']}],
+ ['delayed_job.2', {:quiet => true, :pid_dir => pid_dir, :log_dir => log_dir, :queues => ['test_queue']}],
+ ['delayed_job.3', {:quiet => true, :pid_dir => pid_dir, :log_dir => log_dir, :queues => ['test_queue']}],
+ ['delayed_job.4', {:quiet => true, :pid_dir => pid_dir, :log_dir => log_dir, :queues => ['test_queue']}],
+ ['delayed_job.5', {:quiet => true, :pid_dir => pid_dir, :log_dir => log_dir, :queues => %w[mailers misc]}],
+ ['delayed_job.6', {:quiet => true, :pid_dir => pid_dir, :log_dir => log_dir, :queues => %w[mailers misc]}]
  ].each do |args|
  expect(command).to receive(:run_process).with(*args).once
  end

spec/helper.rb

@@ -21,6 +21,7 @@
 
 require 'action_mailer'
 require 'active_record'
+require 'rails'
 
 require 'delayed_job'
 require 'delayed/backend/shared_spec'
@@ -36,14 +37,7 @@
 end
 ENV['RAILS_ENV'] = 'test'
 
-# Trigger AR to initialize
-ActiveRecord::Base # rubocop:disable Void
-
-module Rails
- def self.root
- '.'
- end
-end
+FakeApp = Class.new(Rails::Application)
 
 Delayed::Worker.backend = :test
 
@@ -76,6 +70,8 @@ def whatever(n, _)
  handle_asynchronously :whatever
 end
 
+FakeApp.initialize!
+
 RSpec.configure do |config|
  config.after(:each) do
  Delayed::Worker.reset