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-code-snippet.rb
    path of file: ./repos/ruby-packer/ruby/gems/test-unit-3.3.4/test
    
    the code of the file until where you have to start completion: # coding: utf-8

require "test-unit"
require "testunit-test-util"

class TestCodeSnippet < Test::Unit::TestCase
  include TestU
    
    def backtrace_from_jruby
      begin
        java.util.Vector.new(-1)
      rescue Exception
        $@.collect do |entry|
          entry.split(/:/, 3)
        end
      else
        flunk("failed to raise an exception from JRuby.")
      end