code: def test_save(self):
      self.classifier.save(filename="catboost_1")
      self.classifier.save(filename="catboost_2", path=".")
  
file_path: adversarial-robustness-toolbox/tests/estimators/classification/test_catboost.py
imports: import logging
  import unittest
  from catboost import CatBoostClassifier
  import numpy
  from art.estimators.classification.catboost import CatBoostARTClassifier
  from tests.utils import TestBase, master_seed
label_desc: Use image node_id 3 for calling the TestCatBoostClassifier obj's underlying member method code with example usage: obj.test_save() without return types