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: bash_functions_spec.rb
    path of file: ./repos/heroku-buildpack-ruby/spec/unit
    
    the code of the file until where you have to start completion: require 'spec_helper'

describe "Bash functions" do
    it "Detects jruby in the Gemfile.lock" do
      Dir.mktmpdir do |dir|
        dir = Pathname(dir)
        dir.join("Gemfile.lock").write <<~EOM
          RUBY VERSION
             ruby 2.5.7p001 (jruby 9.2.13.0)
        EOM


        out = exec_wit
    
  def exec_with_bash_functions(code, stack: "heroku-18")
    contents = <<~EOM
      #! /usr/bin/env bash
      set -eu

      STACK="#{stack}"

      #{bash_functions_file.read}

      #{code}
    EOM

    file = Tempfile.new
    file.write(contents)
    file.close
    FileUtils.chmod("+x", file.path)

    out = nil
    success = false
    begin
      Timeout.timeout(60) do
        out = `#{file.path} 2>&1`.strip
        success = $?.success?
      end
    rescue Timeout::Error
      out = "Command timed out"
      success = false
    end