old_contents: '''tldextract test helpers.'''
  
  from subprocess import CalledProcessError, PIPE, Popen
  import tempfile
  
  
  def check_output(*popenargs, **kwargs):
      '''Copied from Python 2.7.'''
      if 'stdout' in kwargs:
          raise ValueError('stdout argument not allowed, it will be overridden.')
      process = Popen(stdout=PIPE, *popenargs, **kwargs)
      output, _ = process.communicate()
      retcode = process.poll()
      if retcode:
          cmd = kwargs.get("args")
          if cmd is None:
              cmd = popenargs[0]
          raise CalledProcessError(retcode, cmd, output=output)
      return output
  
  
  def temporary_dir():
      """ Make a writable temporary file and return its absolute path.
      """
      return tempfile.mkdtemp()
  
new_contents: '''tldextract test helpers.'''
  
  from subprocess import CalledProcessError, PIPE, Popen
  import tempfile
  
  
  def temporary_dir():
      """ Make a writable temporary file and return its absolute path.
      """
      return tempfile.mkdtemp()
  
subject: Remove unused