code: def test_check_input():
      model = BaseUncertaintyModel(uncertainty_dict=None)
      model._check_input()
      assert model.uncertainty_dict == {}
  
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 3 for calling a global function with example usage: test_check_input() without return types