code: def test_run_explainer(self):
      assert self.test_backend.run_explainer(pd.DataFrame([0])) == [
          [0, 1]
      ]
  
imports: import unittest
  from unittest.mock import patch
  import types
  import numpy
  import pandas
  import category_encoders
  from sklearn.ensemble import RandomForestRegressor, RandomForestClassifier
  from pandas.testing import assert_frame_equal, assert_series_equal
  from shapash.backend.base_backend import BaseBackend, _needs_preprocessing
  from shapash.explainer.smart_state import SmartState
label_desc: Use image node_id 4 for calling the TestBaseBackend obj's underlying member method code with example usage: obj.test_run_explainer() without return types