code: def test_get_max_depth(shadow_dec_tree):
      assert (
          shadow_dec_tree.get_max_depth() == 3
      ), "Max depth should be 3"
  
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 18 for calling a global function with example usage: test_get_max_depth(shadow_dec_tree) without return types