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_sax.rb
    path of file: ./repos/ruby-packer/ruby/test/rexml
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require_relative "rexml_test_utils"
require 'rexml/sax2listener'
require 'rexml/parsers/sax2parser'
require 'rexml/document'

module REXMLTests
  class SAX2Tester < T
    
    def test_sax2
      File.open(fixture_path("documentation.xml")) do |f|
        parser = Parsers::SAX2Parser.new( f )
        # Listen to all events on the following elements
        count = 0
        blok = proc { |uri,localname,qname,attributes|
          assert %w{ bugs todo }.include?(localname),
          "Mismatched name; we got '#{qname}'\nArgs were:\n\tURI: #{uri}\n\tLOCALNAME: #{localname}\n\tQNAME: #{qname}\n\tATTRIBUTES: #{attributes.inspect}\n\tSELF=#{blok}"
          count += 1
        }

        start_document = 0
        end_document = 0
        parser.listen( :start_document ) { start_document += 1 }
        parser.listen( :end_document ) { end_document += 1 }
        parser.listen( :start_element, %w{ changelog bugs todo }, &blok )
        # Listen to all events on the following elements.  Synonymous with
        # listen( :start_element, %w{ ... } )
        parser.listen( %w{ changelog bugs todo }, &blok )
        # Listen for all start element events
        parser.listen( :start_element ) { |uri,localname,qname,attributes|
        }
        listener = MySAX2Listener.new
        # Listen for all events
        parser.listen( listener )
        # Listen for all events on the given elements.  Does not include children
        # events.  Regular expressions work as well!
        parser.listen( %w{ /change/ bugs todo }, listener )
        # Test the deafening method
        blok = proc  { |uri,localname,qname,attributes|
          assert_fail "This listener should have been deafened!"
        }
        parser.listen( %w{ changelog }, &blok )
        parser.deafen( &blok )

        tc = 0
        parser.listen( :characters, %w{version} ) {|text|
          assert(text=~/@ANT_VERSION@/, "version was '#{text}'")
          tc += 1
        }

        begin
          parser.parse
        rescue => exception
          if exception.kind_of? Test::Unit::AssertionFailedError
            raise exception
          end
          puts $!
          puts exception.backtrace
        end