draper_view_context_leakage_reproduction_in_minitest.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"

  git_source(:github) do |repo_name|
    repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?('/')
    "https://github.com/#{repo_name}.git"
  end

  gem "rails"
  gem "pg"
  gem "draper", github: 'showaltb/draper'

  gem "pry" # just for debugging
end

require "active_record"
require "action_controller/railtie"

ActiveRecord::Base.establish_connection(adapter: "postgresql", database: "draper_helper_bug")
ActiveRecord::Base.logger = Logger.new(STDOUT)

ActiveRecord::Schema.define do
  create_table :books, force: true do |t|
    t.string :name
    t.timestamps null: false
  end
end

class Book < ActiveRecord::Base
end

class BookDecorator < Draper::Decorator
  def summary
    [h.app_ctrl_helper, h.my_helper].join " "
  end
end

class TestApp < Rails::Application
  secrets.secret_token    = "secret_token"
  secrets.secret_key_base = "secret_key_base"

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

  routes.draw do
    resources :books, only: :index
  end
end

class ApplicationController < ActionController::Base
  include Rails.application.routes.url_helpers

  def app_ctrl_helper
    "helper from ApplicationController"
  end
  helper_method :app_ctrl_helper
end

class BooksController < ApplicationController
  def index
    Rails.logger.info "The application controller helper method called from controller: " + app_ctrl_helper
    Rails.logger.info "The helper method called from controller: " + my_helper
    render text: BookDecorator.new(resource).summary
  end

  private

  def resource
    book = Book.new
    book.name = "test"
    book.save!
    book
  end

  def my_helper
    "summary!"
  end
  helper_method :my_helper
end

require "minitest/autorun"

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

  def test_index
    get "/books"

    assert last_response.ok?
    assert_equal last_response.body, "helper from ApplicationController summary!"
  end

  private

  def app
    Rails.application
  end
end