code: def test_fit(self, **kwargs):
      pass
  
imports: import warnings
  import os
  import numpy
  from numpy.testing import assert_equal, assert_allclose
  import pandas
  import pytest
  from statsmodels.tools import add_constant
  from statsmodels.tsa.regime_switching import markov_autoregression
label_desc: Use image node_id 2 for calling the TestFilardoPandas obj's underlying member method code with example usage: obj.test_fit() without return types