code: def test_random_index(precalculated_rf_regression_explainer):
      assert isinstance(
          precalculated_rf_regression_explainer.random_index(), int
      )
      assert isinstance(
          precalculated_rf_regression_explainer.random_index(
              return_str=True
          ),
          str,
      )
  
imports: import pandas
  import numpy
  from pandas.api.types import is_categorical_dtype, is_numeric_dtype
  import plotly.graph_objects
label_desc: Use image node_id 3 for calling a global function with example usage: test_random_index(precalculated_rf_regression_explainer) without return types