old_contents: def __open_worksheet():
      pass
  
  def __get_data():
      pass
  
  def __write_data():
      pass
  
  
new_contents: def __open_worksheet():
      pass
  
  def __get_data():
      pass
  
  def __write_data():
      pass
  
  def parse_worksheet():
      pass
  
subject: Add code to fix failing test