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_utils.rb
    path of file: ./repos/jruby/test/tool/test/webrick
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require "test/unit"
require "webrick/utils"

class TestWEBrickUti
    
  def listener_address(port)
    listeners = WEBrick::Utils.create_listeners("127.0.0.1", port)
    srv = listeners.first
    assert_kind_of TCPServer, srv
    srv.addr
  ensure
    listeners.each(&:close) if listeners
  end