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_thread_fd_close.rb
    path of file: ./repos/ruby-packer/ruby/test/-ext-/thread_fd_close
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require 'test/unit'
require '-test-/thread_fd_close'
require 'io/wait'

class TestThreadFdClose < Test::Unit::TestCase

  def test_thread_fd_close
    IO.pipe do |r, w|
 
    
  def test_thread_fd_close
    IO.pipe do |r, w|
      th = Thread.new do
        begin
          assert_raise(IOError) {
            r.read(4)
          }
        ensure
          w.syswrite('done')
        end
      end
      Thread.pass until th.stop?
      IO.thread_fd_close(r.fileno)
      assert_equal 'done', r.read(4)
      th.join
    end