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_psych.rb
    path of file: ./repos/psych/test/psych
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require_relative 'helpe
    
  def test_dump_file
    hash = {'hello' => 'TGIF!'}
    Tempfile.create('fun.yml') do |io|
      assert_equal io, Psych.dump(hash, io)
      io.rewind
      assert_equal Psych.dump(hash), io.read
    end
  end