code: def test_no_penalization(self):
      res_ols = OLS(self.res1.model.endog, self.res1.model.exog).fit()
      res_theil = self.res1.model.fit(
          pen_weight=0, cov_type="data-prior"
      )
      assert_allclose(res_theil.params, res_ols.params, rtol=1e-10)
      assert_allclose(res_theil.bse, res_ols.bse, rtol=1e-10)
  
imports: import os
  import numpy
  import pandas
  import pytest
  from numpy.testing import assert_allclose
  from statsmodels.regression.linear_model import OLS, GLS
  from statsmodels.sandbox.regression.penalized import TheilGLS
label_desc: Use image node_id 4 for calling the TestTheilTextile obj's underlying member method code with example usage: obj.test_no_penalization() without return types