code: def test_classes(shadow_dec_tree):
      assert shadow_dec_tree.classes()[0] == 0
      assert shadow_dec_tree.classes()[1] == 1
  
imports: import joblib
  import numpy
  import pytest
  from sklearn.tree import DecisionTreeRegressor, DecisionTreeClassifier
  from dtreeviz.models.sklearn_decision_trees import ShadowSKDTree
label_desc: Use image node_id 10 for calling a global function with example usage: test_classes(shadow_dec_tree) without return types