code: def test_init(uncertainty_dict):
      model = BaseUncertaintyModel(
          uncertainty_dict=uncertainty_dict, a=1, b="2"
      )
      assert model.uncertainty_dict == uncertainty_dict
      assert model.a == 1
      assert model.b == "2"
      assert model.uncertainty_method is None
      assert model.params is None
      assert model.train_df is None
      assert model.uncertainty_model is None
      assert model.pred_df is None
  
imports: import pandas
  import pytest
  from greykite.sklearn.uncertainty.base_uncertainty_model import BaseUncertaintyModel
  from greykite.sklearn.uncertainty.uncertainty_methods import UncertaintyMethodEnum
label_desc: Use image node_id 2 for calling a global function with example usage: test_init(uncertainty_dict) without return types