code: def test_Overlay(self):
      overlay_path, _ = VideoAugConfig(
          input_file_index=1
      ).get_input_path()
      self.evaluate_class(
          vidaugs.Overlay(overlay_path=overlay_path), fname="overlay"
      )
  
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 18 for calling the TransformsVideoUnitTest obj's underlying member method code with example usage: obj.test_Overlay() without return types