require 'bundler/inline'

gemfile do
  source 'https://rubygems.org'
  gem 'minitest'
  gem 'rack', '2.2.2'
  gem 'rack-test', '2.1.0'
end

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

class MyEventHandler
  include ::Rack::Events::Abstract

  MyError = Class.new(StandardError)

  def on_start(_, _)
    $stderr.puts __method__
  end

  def on_send(_, _)
    $stderr.puts __method__
  end

  def on_commit(_, _)
    $stderr.puts __method__
  end

  def on_finish(_, _)
    raise MyError, 'unexpected'
  end

  def on_error(_, _, _)
    $stderr.puts __method__
  end
end

class BufferedTest < MiniTest::Test
  include Rack::Test::Methods

  def app
    Rack::Builder.new.tap do |builder|
      builder.use Rack::Events, [MyEventHandler.new]
      builder.run ->(_env) { [200, { 'content-type' => 'text/plain' }, Rack::BodyProxy.new('All responses are OK') { puts 'Hello world' }] }
    end
  end

  def test_root
    assert_raises MyEventHandler::MyError do
      get '/'
    end
  end
end