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_class.rb
    path of file: ./repos/jruby/test/jruby
    
    the code of the file until where you have to start completion: require 'test/unit'

class TestClass < Test::Unit::TestCase

    
  def test_sclass_return
    c = Class.new do
      def foo
        class << self
          return 'foo'
        end
      end
    end