code: def test_make_dirs(self, mock_dirs):
      _Checkpointer("thisdirectoryshouldntexist/norshouldthis/model.pt")
      mock_dirs.assert_called_once_with(
          "thisdirectoryshouldntexist/norshouldthis"
      )
  
imports: from unittest import TestCase
  from mock import patch, Mock
  import torchbearer
  from torchbearer import Trial
  from torchbearer.callbacks.checkpointers import _Checkpointer, ModelCheckpoint, MostRecent, Interval, Best
  import warnings
label_desc: Use image node_id 1 for calling the TestCheckpointer obj's underlying member method code with example usage: obj.test_make_dirs(mock_dirs) without return types