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: sig.rb
    path of file: ./repos/sorbet/gems/sorbet-runtime/test/types
    
    the code of the file until where you have to start completion: # frozen_string_literal: true
require_relative '../test_helper'

class Opus::Types::Test::SigTest < Critic::Unit::UnitTest
  it 'works on a class' do
    klass = Class.ne
    
  def fake_stderr_with_warnings
    original_stderr = $stderr
    original_verbose = $VERBOSE
    $stderr = StringIO.new
    $VERBOSE = true
    yield
    $stderr.string
  ensure
    $stderr = original_stderr
    $VERBOSE = original_verbose
  end