code: def test_fit(self, **kwargs):
      kwargs.setdefault("em_iter", 10)
      kwargs.setdefault("maxiter", 100)
      super().test_fit(**kwargs)
  
imports: import os
  import warnings
  import numpy
  from numpy.testing import assert_allclose, assert_raises
  import pandas
  import pytest
  from statsmodels.tsa.regime_switching import markov_switching, markov_regression
label_desc: Use image node_id 2 for calling the TestAreturnsConstL1Variance obj's underlying member method code with example usage: obj.test_fit() without return types