code: def test_predict2(self):
      results = self.module.predict(
          img=cv2.imread("tests/test.jpg"), visualization=False
      )
      kps = results["candidate"].tolist()
      self.assertIsInstance(kps, list)
  
file_path: PaddleHub/modules/image/keypoint_detection/openpose_body_estimation/test.py
imports: import os
  import shutil
  import unittest
  import cv2
  import requests
  import paddlehub
label_desc: Use image node_id 4 for calling the TestHubModule obj's underlying member method code with example usage: obj.test_predict2() without return types