code: def test_feature_number(shadow_dec_tree):
      assert shadow_dec_tree.feature_names == [
          "Pclass",
          "Age",
          "Fare",
          "Sex_label",
          "Cabin_label",
          "Embarked_label",
      ]
  
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 4 for calling a global function with example usage: test_feature_number(shadow_dec_tree) without return types