code: def test_type(self):
      self.assertIsInstance(
          self.classifier,
          type(ScikitlearnRegressor(model=self.sklearn_model)),
      )
      with self.assertRaises(TypeError):
          ScikitlearnDecisionTreeRegressor(model="sklearn_model")
  
file_path: adversarial-robustness-toolbox/tests/estimators/regression/test_scikitlearn.py
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import logging
  import unittest
  import numpy
  from sklearn.tree import DecisionTreeRegressor
  from art.estimators.regression.scikitlearn import ScikitlearnDecisionTreeRegressor
  from art.estimators.regression.scikitlearn import ScikitlearnRegressor
  from tests.utils import TestBase, master_seed
label_desc: Use image node_id 2 for calling the TestScikitlearnDecisionTreeRegressor obj's underlying member method code with example usage: obj.test_type() without return types