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: git_test_helper.rb
    path of file: ./repos/arvados/services/api/test/helpers
    
    the code of the file until where you have to start completion: # Copyright (C) The Arvados Authors. All rights reserved.
#
# SPDX-License-Identifier: AGPL-3.0

require 'fileutils'
require 'tmpdir'

# Commit log for "foo" repository in test.git.tar
# main is the main branch
# b1 is a branch off of main 
# tag1 is a tag
#
# 1de84a8 * b1
# 077ba2a * main
# 4fe459a * tag1
# 31ce37f * foo

module GitTestHelper
  def self.included base
    base.setup do
      # Extract the test repository data into the default test
      # environment's Rails.configuration.Git.Repositories. (We
      # don't use that config setting here, though: it doesn't seem
      # worth the risk of stepping on a real git repo root.)
      @tmpdir = Rails.root.join 'tmp', 'git'
      FileUtils.mkdir_p @tmpdir
      system("tar", "-xC", @tmpdir.to_s, "-f", "test/test.git.tar")
      Rails.co
    
  def self.included base
    base.setup do
      # Extract the test repository data into the default test
      # environment's Rails.configuration.Git.Repositories. (We
      # don't use that config setting here, though: it doesn't seem
      # worth the risk of stepping on a real git repo root.)
      @tmpdir = Rails.root.join 'tmp', 'git'
      FileUtils.mkdir_p @tmpdir
      system("tar", "-xC", @tmpdir.to_s, "-f", "test/test.git.tar")
      Rails.configuration.Git.Repositories = "#{@tmpdir}/test"
      Rails.configuration.Containers.JobsAPI.GitInternalDir = "#{@tmpdir}/internal.git"
    end

    base.teardown do
      FileUtils.remove_entry CommitsHelper.cache_dir_base, true
      FileUtils.mkdir_p @tmpdir
      system("tar", "-xC", @tmpdir.to_s, "-f", "test/test.git.tar")
    end
  end

  def internal_tag tag
    IO.read "|git --git-dir #{Rails.configuration.Containers.JobsAPI.GitInternalDir.shellescape} log --format=format:%H -n1 #{tag.shellescape}"
  end

  # Intercept fetch_remote_repository and fetch from a specified url
  # or local fixture instead of the remote url requested. fakeurl can
  # be a url (probably starting with file:///) or the name of a
  # fixture (as a symbol)
  def fetch_remote_from_local_repo url, fakeurl
    if fakeurl.is_a? Symbol
      fakeurl = 'file://' + repositories(fakeurl).server_path
    end
    CommitsHelper.expects(:fetch_remote_repository).once.with do |gitdir, giturl|
      if giturl == url
        CommitsHelper.unstub(:fetch_remote_repository)
        CommitsHelper.fetch_remote_repository gitdir, fakeurl
        true
      end
    end