code: def test_defaults_smoke(default_kwargs, robust):
      class_kwargs, _, _ = _to_class_kwargs(default_kwargs, robust)
      endog = class_kwargs["endog"]
      period = class_kwargs["period"]
      mod = STL(endog=endog, period=period)
      mod.fit()
  
imports: from statsmodels.compat.pandas import MONTH_END
  import os
  import pickle
  import numpy
  from numpy.testing import assert_allclose
  import pandas
  import pytest
  from statsmodels.datasets import co2
  from statsmodels.tsa.seasonal import STL, DecomposeResult
label_desc: Use image node_id 16 for calling a global function with example usage: test_defaults_smoke(default_kwargs, robust) without return types