code: def setup_class(cls):
      true = {
          "params": np.r_[
              0.9820939, 0.0503587, 3.70877, 9.556793, 2.107562**2
          ],
          "llf": -29.909297,
          "llf_fit": -7.8553370,
          "llf_fit_em": -7.8554974,
      }
      super().setup_class(true, fedfunds[-10:], k_regimes=2)
  
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 1 for calling the TestFedFundsConstShort obj's underlying member method code with example usage: obj.setup_class(cls) without return types