class_docstr: config unit test
docstr: valid config unittest 
docstr_tok: ["valid","config","unittest"]
code: def test_valid_config(self):
      """valid config unittest"""
      utils.save_config(self.conf_true, self.conf_file)
      conf = utils.load_config(self.conf_file)
      self.assertEqual(utils.valid_config(conf), True)
  
file_path: delta/delta/utils/config_test.py
imports: import tempfile
  from absl import logging
  import os
  import delta.compat
  from delta import utils
  from delta import PACKAGE_ROOT_DIR
label_desc: Use image node_id 5 for calling the ConfigTest obj's underlying member method code with example usage: obj.test_valid_config() without return types