_test.html.erb

hi from test.html

_test.text.erb

hi from test.text

test.rb

unless File.exist?('Gemfile')
  File.write('Gemfile', <<-GEMFILE)
    source 'https://rubygems.org'
    gem 'rails', github: 'rails/rails'
    gem 'arel', github: 'rails/arel'
  GEMFILE

  system 'bundle'
end

require 'bundler'
Bundler.setup(:default)

require 'rails'
require 'action_controller/railtie'

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

   def prepend_view_paths
     prepend_view_path "#{Rails.root}"
   end

  def index
    render_to_string partial: "./test.text.erb", :layout => false
    render partial: "./test.html.erb"
  end
end

require 'minitest/autorun'
require 'rack/test'

# 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 '/'
    assert last_response.ok?
    assert_equal 'text/html; charset=utf-8', last_response.headers['Content-Type']
  end

  private
    def app
      Rails.application
    end
end