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_set.rb
    path of file: ./repos/ruby-packer/ruby/test/psych
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require_relative 'helper'

module Psych
  class Test
    
    def test_set_shorthand
      loaded = Psych.load(<<-eoyml)
--- !!set
foo: bar
bar: baz
      eoyml
      assert_instance_of(Psych::Set, loaded)
    end