code: def test_valid_config(self):
      file_names = glob.glob("./config_files/valid/*.yml")
      for fn in file_names:
          experiment_config = get_yml_content(fn)
          validate_all_content(experiment_config, fn)
          print_green("config file:", fn, "validation success!")
  
file_path: nni/test/ut/tools/nnictl/test_config_validation.py
imports: import glob
  from unittest import TestCase, main
  from schema import SchemaError
  from nni.tools.nnictl.launcher_utils import validate_all_content
  from nni.tools.nnictl.nnictl_utils import get_yml_content
  from nni.tools.nnictl.common_utils import print_error, print_green
label_desc: Use image node_id 1 for calling the ConfigValidationTestCase obj's underlying member method code with example usage: obj.test_valid_config() without return types