code: def geist_replay(wrapped, instance, args, kwargs):
      
      path_parts = []
      file_parts = []
  
      if hasattr(wrapped, '__module__'):
          module = wrapped.__module__
          module_file = sys.modules[module].__file__
          root, _file = os.path.split(module_file)
          path_parts.append(root)
          _file, _ = os.path.splitext(_file)
          file_parts.append(_file)
      if hasattr(wrapped, '__objclass__'):
          file_parts.append(wrapped.__objclass__.__name__)
      elif hasattr(wrapped, '__self__'):
          file_parts.append(wrapped.__self__.__class__.__name__)
      file_parts.append(wrapped.__name__ + '.log')
      path_parts.append('_'.join(file_parts))
      filename = os.path.join(*path_parts)
  
      if is_in_record_mode():
          platform_backend = get_platform_backend()
          backend = RecordingBackend(
              source_backend=platform_backend,
              recording_filename=filename
          )
      else:
          backend = PlaybackBackend(
              recording_filename=filename
          )
      gui = GUI(backend)
      return wrapped(gui, *args, **kwargs)
docs: Wraps a test of other function and injects a Geist GUI which will
      enable replay (set environment variable GEIST_REPLAY_MODE to 'record' to
      active record mode.