code: def test_clas_externalsource_index_list(
      classifier_explainer_with_external_data,
  ):
      index_list = (
          classifier_explainer_with_external_data.get_index_list()
      )
      assert "100" in index_list
      assert not "160" in index_list
  
imports: import pytest
  import pandas
  from explainerdashboard.explainers import ClassifierExplainer, RegressionExplainer
  from explainerdashboard.datasets import titanic_survive, titanic_fare
label_desc: Use image node_id 8 for calling a global function with example usage: test_clas_externalsource_index_list(classifier_explainer_with_external_data) without return types