code: def test_set_classifier():
      """Test set method of Classifier class."""
      classifier = Classifier()
      with pytest.raises(ValueError):
          classifier._Classifier__set_classifier("wrong_strategy")
  
file_path: MLBox/tests/test_classifier.py
imports: import pytest
  import pandas
  import numpy
  from mlbox.model.classification.classifier import Classifier
  from lightgbm import LGBMClassifier
label_desc: Use image node_id 4 for calling a global function with example usage: test_set_classifier() without return types