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: helper.rb
    path of file: ./repos/iruby/test
    
    the code of the file until where you have to start completion: require "iruby"
require "json"
require 'multi_json'
require "pathname"
require "rbconfig"
require "test/unit"
require "test/unit/rr"
require "tmpdir"

IRuby.logger = IRuby::MultiLogger.new(*Logger.new(STDERR, level: Logger::Severity::INFO))

module IRubyTest
  class TestBase < Test::Unit::TestCase
    TEST_DIR = File.expand_path("..", __FILE__).freeze
    EXE_DIR = File.expand_path("../exe", TEST_DIR).freeze
    LIB_DIR = File.expand_path("../lib", TEST_DIR).freeze

    RUBY = RbConfig.ruby.freeze
    IRUBY_PATH = F
    
    def self.startup
      @__work_dir = Dir.mktmpdir("iruby-test-data")

      @__jupyter_data_dir = File.join(@__work_dir, "jupyter")
      @__save_jupyter_data_dir = ENV["JUPYTER_DATA_DIR"]
      ENV["JUPYTER_DATA_DIR"] = @__jupyter_data_dir

      @__config_dir = File.join(@__work_dir, "config")
      @__config_path = Pathname.new(@__config_dir) + "config.json"
      @__config_path.dirname.mkpath
      File.write(@__config_path, {
        control_port: 50160,
        shell_port: 57503,
        transport: "tcp",
        signature_scheme: "hmac-sha256",
        stdin_port: 52597,
        hb_port: 42540,
        ip: "127.0.0.1",
        iopub_port: 40885,
        key: "a0436f6c-1916-498b-8eb9-e81ab9368e84"
      }.to_json)

      @__original_kernel_instance = IRuby::Kernel.instance
    end