code: def setUpClass(cls):
      super().setUpClass()
      with open(VIDEO_METADATA_PATH, "r") as f:
          cls.metadata = json.load(f)
  
imports: import json
  import unittest
  from augly import video
  from augly.tests.base_configs import VideoAugConfig
  from augly.tests.video_tests.base_unit_test import BaseVideoUnitTest
  from augly.utils import VIDEO_METADATA_PATH
label_desc: Use image node_id 1 for calling the TransformsVideoUnitTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types