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_gem_bundler_version_finder.rb
    path of file: ./repos/rubygems/test/rubygems
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require_relative "helper"
require "rubygems/bundler_version_finder"

class TestGemBundlerVersionFinder < Gem::TestCase
  def setup
    @argv = ARGV.dup
    @dollar_0 = $0
    super

    without_any_upwards_gemfiles
  end

  def teardown
    ARGV.replace @argv
    $0 = @dollar_0

    super
  end

  def bvf
    Gem::Bun
    
  def test_bundler_version_with_bundle_update_bundler
    ARGV.replace %w[update --bundler]
    assert_nil bvf.bundler_version
    $0 = "/foo/bar/bundle"
    assert_nil bvf.bundler_version
    ARGV.replace %w[update --bundler=1.1.1.1 gem_name]
    assert_equal v("1.1.1.1"), bvf.bundler_version
    ARGV.replace %w[update --bundler 1.1.1.1 gem_name]
    assert_equal v("1.1.1.1"), bvf.bundler_version
    ARGV.replace %w[update --bundler\ 1.1.1.1 gem_name]
    assert_equal v("1.1.1.1"), bvf.bundler_version
    ARGV.replace %w[update --bundler\ 1.1.1.2 --bundler --bundler 1.1.1.1 gem_name]
    assert_equal v("1.1.1.1"), bvf.bundler_version
    $0 = "other"
    assert_nil bvf.bundler_version
  end