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_commands_setup_command.rb
    path of file: ./repos/truffleruby/test/mri/tests/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "helper"
require "rubygems/commands/setup_command"

class TestGemCommandsSetupCommand < Gem::TestCase
  bundler_gemspec = File.expand_path("../../bundler/lib/bundler/version.rb
    
  def test_destdir_flag_does_not_try_to_write_to_the_default_gem_home
    FileUtils.chmod "-w", File.join(@gemhome, "plugins")

    destdir = File.join(@tempdir, "foo")

    @cmd.options[:destdir] = destdir
    @cmd.execute

    bundler_spec.executables.each do |e|
      assert_path_exist prepend_destdir(destdir, File.join(@gemhome, "gems", bundler_spec.full_name, bundler_spec.bindir, e))
    end
  end