Reproduction steps for rails/rails #25068

25068_reproduction_steps.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 "rails", github: "rails/rails"
end

require "action_controller/railtie"

class TestApp < Rails::Application
  config.root = File.dirname(__FILE__)
  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
  include Rails.application.routes.url_helpers

  def index
    render json: RubyVM.stat
  end
end

require "minitest/autorun"
require "rack/test"

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

  def test_returns_success
    class_serials = []

    get "/"
    subject = JSON.parse(last_response.body)["class_serial"]
    class_serials << subject
    get "/"
    class_serials << JSON.parse(last_response.body)["class_serial"]
    get "/"
    class_serials << JSON.parse(last_response.body)["class_serial"]
    get "/"
    class_serials << JSON.parse(last_response.body)["class_serial"]
    get "/"
    class_serials << JSON.parse(last_response.body)["class_serial"]

    Rails.logger.warn "#{subject} blew up to #{class_serials}"
    assert_equal 1, class_serials.uniq.length
  end

  private
    def app
      Rails.application
    end
end