code: def test_classes(tf_shadow_clf):
      assert (tf_shadow_clf.classes() == [0, 1]).all()
  
imports: import pytest
  import numpy
  import tensorflow_decision_forests
  from dtreeviz.models.tensorflow_decision_tree import ShadowTensorflowTree
label_desc: Use image node_id 8 for calling a global function with example usage: test_classes(tf_shadow_clf) without return types