code: def test_check_params(self):
      with self.assertRaises(ValueError):
          _ = LabelSmoothing(max_value=-1)
  
file_path: adversarial-robustness-toolbox/tests/defences/test_label_smoothing.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import unittest
  import numpy
  from art.defences.preprocessor import LabelSmoothing
  from tests.utils import master_seed
label_desc: Use image node_id 4 for calling the TestLabelSmoothing obj's underlying member method code with example usage: obj.test_check_params() without return types