code: def test_ExtractLine2(self):
      self.module.ExtractLine(image="tests/test.jpg", use_gpu=True)
      self.assertTrue(os.path.exists("output/output.png"))
  
file_path: PaddleHub/modules/image/semantic_segmentation/Extract_Line_Draft/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_ExtractLine2() without return types