A standalone rails script for reproducing bugs in rails

rails-standalone.rb

require 'action_controller/railtie'
require 'minitest/autorun'
require 'rack/test'

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 '/form' => 'forms#form'
  end
end

class FormsController < ActionController::Base
  include Rails.application.routes.url_helpers
  include ActionView::Helpers::FormHelper
  include ActionView::Context
  
  def form
    @ticket = Ticket.new(priority: Ticket.priorities['High'])
    render html: form_for(@ticket) { |f| f.hidden_field :priority }
  end

  def tickets_path
    '/form_path'
  end
end

require 'active_record'
require 'logger'

ActiveRecord::Base.establish_connection(adapter: 'sqlite3', database: ':memory:')
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :tickets, force: true do |t|
    t.integer "priority"
  end
end

class Ticket < ActiveRecord::Base
  enum priority: { 'High': 0, 'Middle': 1, 'Low': 2 }
end

require 'rails/test_help'
class FormsControllerTest < ActionController::TestCase
  # tests FormController
  # include Rack::Test::Methods

  def test_returns_success
    get :form
    assert_includes response.body, 'High'
  end

  private
    def app
      Rails.application
    end
end