cookies-serialization-bug.rb

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'
  #gem 'railties', '4.2.7' # it's also present in version 4
  gem 'railties', '5.0.0'
end

require 'rack/test'
require 'action_controller/railtie'

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

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

  routes.draw do
    get '/' => 'test#index'
  end
end

class TestController < ActionController::Base
  def index
    a, b = cookies['a'], cookies['b']
    cookies['a'] = {}
    cookies['b'] = 1
    render plain: [a.inspect, b.inspect].join("-")
  end
end

require 'minitest/autorun'

# Ensure backward compatibility with Minitest 4
Minitest::Test = MiniTest::Unit::TestCase unless defined?(Minitest::Test)

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

  def test_returns_success
    get '/' # the first request will return the cookies in the HEADER
    #puts last_response.get_header('Set-Cookie').inspect
    get '/' # the second request will send back the returned cookies
    assert_equal '{}-1', last_response.body.force_encoding('utf-8')
  end

  private
    def app
      Rails.application
    end
end