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_syntax.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/ruby
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require 'test/unit'

class TestSyntax < Test::Unit::TestCase
  using Module.new {
    refi
    
  def assert_syntax_files(test)
    srcdir = File.expand_path("../../..", __FILE__)
    srcdir = File.join(srcdir, test)
    assert_separately(%W[--disable-gem - #{srcdir}],
                      __FILE__, __LINE__, <<-'eom', timeout: Float::INFINITY)
      dir = ARGV.shift
      for script in Dir["#{dir}/**/*.rb"].sort
        assert_valid_syntax(IO::read(script), script)
      end