You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_gem_rdoc.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require 'rubygems'
require_relative 'helper'
require 'rubygems/rdoc'

class TestGemRDoc < Gem::TestCase
  Gem::RDoc.load_rdoc

  def setup
    super

    @a = util_spec 'a' do |s|
      s.rdoc_options = %w[--main MyTitle]
      s.extra_rdoc_fi
    
  def test_setup_unwritable
    pend 'chmod not supported' if Gem.win_platform?
    pend 'skipped in root privilege' if Process.uid.zero?
    FileUtils.mkdir_p @a.doc_dir
    FileUtils.chmod 0, @a.doc_dir

    e = assert_raise Gem::FilePermissionError do
      @hook.setup
    end

    assert_equal @a.doc_dir, e.directory
  ensure
    if File.exist? @a.doc_dir
      FileUtils.chmod 0755, @a.doc_dir
      FileUtils.rm_r @a.doc_dir
    end