code: def test_list(self):
      # TODO
      pass
  
file_path: BigDL/python/nano/test/automl/common/test_space.py
imports: import pytest
  import os
  from unittest import TestCase
  import bigdl.nano.automl.hpo.space
label_desc: Use image node_id 4 for calling the TestHPOSpace obj's underlying member method code with example usage: obj.test_list() without return types