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_timeout.rb
    path of file: ./repos/truffleruby/test/mri/tests/fiber
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require 'test/unit'
require_relative 'scheduler'

require 'timeout'

class TestFiberTimeout < Test::Unit::TestCase
  def test_timeout_after
    error = nil

    thread = Thread.new do
    
    
  def test_timeout_on_main_fiber
    message = nil

    thread = Thread.new do
      scheduler = Scheduler.new
      Fiber.set_scheduler scheduler

      assert_nil Fiber.current_scheduler

      Timeout.timeout(1) do
        message = MESSAGE
      end
    end

    thread.join

    assert_equal MESSAGE, message
  end