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_modify_expand.rb
    path of file: ./repos/jruby/test/mri/-ext-/string
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require 'test/unit'
require "-test-/string"
require "
    
  def test_modify_expand_memory_leak
    assert_no_memory_leak(["-r-test-/string"],
                          <<-PRE, <<-CMD, "rb_str_modify_expand()", limit: 2.5)
      s=Bug::String.new
    PRE
      size = $initial_size
      10.times{s.modify_expand!(size)}
      s.replace("")
    CMD
  end