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: common.rb
    path of file: ./repos/hexapdf/test/hexapdf/font/true_type/table
    
    the code of the file until where you have to start completion: # -*- encoding: utf-8 -*-

require 'test_helper'
require 'stringio'
require 'hexapdf/font/true_type'

m
    
    def set_up_stub_true_type_font(initial_data = ''.b, register_vars: true)
      font = ::Object.new
      font.define_singleton_method(:io) { @io ||= StringIO.new(initial_data) }
      font.define_singleton_method(:config) { @config ||= {} }
      entry = HexaPDF::Font::TrueType::Table::Directory::Entry.new('mock', 0, 0, initial_data.length)
      @font, @entry = font, entry if register_vars
      [font, entry]
    end