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_variable.rb
    path of file: ./repos/truffleruby/test/mri/tests/ruby
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require 'test/unit'

class TestVariable < Test::Unit::Test
    
  def test_cvar_overtaken_by_module
    error = eval <<~EORB
      class ParentForModule
        @@cvar = 1

        def self.cvar
          @@cvar
        end
      end