code: def test_graphviz_available(precalculated_xgb_multiclass_explainer):
      assert isinstance(
          precalculated_xgb_multiclass_explainer.graphviz_available,
          bool,
      )
  
file_path: explainerdashboard/tests/test_xgboost_treeviz.py
imports: import unittest
  import pandas
  import plotly.graph_objects
  import dtreeviz
  from xgboost import XGBClassifier
  from explainerdashboard.explainers import ClassifierExplainer
  from explainerdashboard.datasets import *
label_desc: Use image node_id 9 for calling a global function with example usage: test_graphviz_available(precalculated_xgb_multiclass_explainer) without return types