code: def test_summary(self):
      with warnings.catch_warnings():
          warnings.filterwarnings(
              "ignore", "kurtosistest only valid for n>=20"
          )
          self.model.fit().summary()
  
imports: from statsmodels.compat.pandas import assert_series_equal
  from io import StringIO
  import warnings
  import numpy
  import numpy.testing
  import pandas
  import patsy
  import pytest
  from statsmodels.datasets import cpunish
  from statsmodels.datasets.longley import load, load_pandas
  from statsmodels.formula.api import ols
  from statsmodels.formula.formulatools import make_hypotheses_matrices
  from statsmodels.tools import add_constant
  from statsmodels.tools.testing import assert_equal
label_desc: Use image node_id 6 for calling the CheckFormulaOLS obj's underlying member method code with example usage: obj.test_summary() without return types