code: def test_auto_fit_with_box_cox(data):
      periods = (5, 6, 7)
      mod = MSTL(endog=data, periods=periods, lmbda="auto")
      mod.fit()
      assert hasattr(mod, "est_lmbda")
      assert isinstance(mod.est_lmbda, float)
  
file_path: statsmodels/statsmodels/tsa/stl/tests/test_mstl.py
imports: from pathlib import Path
  from numpy.testing import assert_allclose, assert_equal
  import pandas
  import pytest
  from statsmodels.tsa.seasonal import MSTL
label_desc: Use image node_id 9 for calling a global function with example usage: test_auto_fit_with_box_cox(data) without return types