code: def test_cocovid(self):
      from sahi.utils.coco import CocoVid
  
imports: import os
  import shutil
  import unittest
  from sahi.utils.coco import merge, update_categories
  from sahi.utils.file import load_json
label_desc: Use image node_id 20 for calling the TestCocoUtils obj's underlying member method code with example usage: obj.test_cocovid() without return types