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: hiera_spec.rb
    path of file: ./repos/puppet/spec/unit/functions
    
    the code of the file until where you have to start completion: require 'spec_helper'
require 'puppet_spec/compiler'
require 'puppet/pops'

describe 'when calling' do
  include PuppetSpec::Compiler
  include PuppetSpec::Fi
    
  def with_scope(code = 'undef')
    result = nil
    Puppet[:code] = 'undef'
    Puppet::Util::Log.with_destination(Puppet::Test::LogCollector.new(logs)) do
      compiler.compile do |catalog|
        result = yield(compiler.topscope)
        catalog
      end
    end
    result
  end