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

require_relative "helper"

class GemTest < Gem::TestCase
  def test_rubygems_normal
    
  def util_install_operating_system_rb(content)
    dir_lib = Dir.mktmpdir("test_operating_system_lib", @tempdir)
    dir_lib_arg = File.join dir_lib, "lib"

    operating_system_rb = operating_system_rb_at(dir_lib_arg)

    FileUtils.mkdir_p File.dirname(operating_system_rb)

    File.open(operating_system_rb, "w") {|f| f.write content }

    dir_lib_arg
  end