code: def tearDown(self) -> None:
      self.root.cleanup()
  
file_path: mmocr/tests/test_datasets/test_preparers/test_packers/test_textdet_packer.py
imports: import os.path
  import tempfile
  import unittest
  import cv2
  import numpy
  from mmocr.datasets.preparers import TextDetPacker
label_desc: Use image node_id 4 for calling the TestTextDetPacker obj's underlying member method code with example usage: obj.tearDown() without return types