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

class TestFiberIO < Test::Unit::TestCase
  MESSAGE = "Hello World"

  def test_read
    skip "UNIXSocket is not defined!" unless defined?(UNIXSocket)

    i, o = UNIXSocket.pair

    unless i.nonblock
    
  def test_tcp_connect
    server = TCPServer.new('localhost', 0)

    th = Thread.new do
      Fiber.set_scheduler(Scheduler.new)

      Fiber.schedule do
        sender = TCPSocket.new('localhost', server.local_address.ip_port)
        sender.write "hello"
        sender.close
      end
    end

    recver = server.accept
    assert "hello", recver.read

    recver.close
    server.close
    th.join
  end