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

class TestWeakDrbIdConv < Test::Unit::TestCase
  def test
    
  def test_weak_drb_id_conv
    conv = DRb::DRbIdConv.new
    obj_ary = []
    id_ary = []

    # populate
    100.times do
      obj = Object.new
      obj_ary << obj
      id_ary << conv.to_id(obj)
    end

    # confirm they're there
    id_ary.each do |id|
      assert conv.to_obj(id)
    end

    # dereference objects and force GC
    obj_ary = nil
    2.times {java.lang.System.gc}
    
    # confirm they're gone
    id_ary.each do |id|
      assert !conv.to_obj(id)
    end
  end