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_init.rb
    path of file: ./repos/irb/test/irb
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require "irb"
require "fileutils"

require_relative "helper"

module TestIRB
  class InitTest < TestCase
    def setup
      # IRBRC is for RVM...
      @backup_env = %w[HOME XDG_CONFIG_HOME IRBRC].each_with_object({}) do |env, hash|
        hash[env] = ENV.delete(env)
      end
    
    
    def test_rc_files_contains_non_env_files
      tmpdir = @tmpdir
      FileUtils.mkdir_p("#{tmpdir}/.irbrc")
      FileUtils.mkdir_p("#{tmpdir}/_irbrc")
      FileUtils.mkdir_p("#{tmpdir}/irb.rc")
      FileUtils.mkdir_p("#{tmpdir}/$irbrc")

      Dir.chdir(tmpdir) do
        IRB.conf[:RC_NAME_GENERATOR] = nil
        assert_includes IRB.rc_files, tmpdir+"/.irbrc"
        assert_includes IRB.rc_files, tmpdir+"/_irbrc"
        assert_includes IRB.rc_files, tmpdir+"/irb.rc"
        assert_includes IRB.rc_files, tmpdir+"/$irbrc"
      end
    end