code: def test_error_when_regression_is_not_bool():
      with pytest.raises(ValueError):
          DecisionTreeDiscretiser(regression="other")
  
file_path: feature_engine/tests/test_discretisation/test_decision_tree_discretiser.py
imports: import numpy
  import pandas
  import pytest
  from sklearn.exceptions import NotFittedError
  from feature_engine.discretisation import DecisionTreeDiscretiser, EqualWidthDiscretiser
label_desc: Use image node_id 3 for calling a global function with example usage: test_error_when_regression_is_not_bool() without return types