code: def test_base_summary():
      cv = pd.Series([1.0, 2, 3], index=[1, 5, 10])
      y = np.random.standard_normal(1000)
      x = np.random.standard_normal((1000, 2))
      xsection = _cross_section(y, x, "ct")
      res = ResidualCointegrationTestResult(
          1.0, 0.05, cv, xsection=xsection
      )
      assert isinstance(res.summary(), Summary)
  
file_path: arch/arch/tests/unitroot/test_engle_granger.py
imports: import numpy
  from numpy.testing import assert_allclose
  import pandas
  import pytest
  from statsmodels.iolib.summary import Summary
  from arch.unitroot._engle_granger import engle_granger_cv, engle_granger_pval
  from arch.unitroot._shared import ResidualCointegrationTestResult, _cross_section
  from arch.unitroot.cointegration import engle_granger
label_desc: Use image node_id 12 for calling a global function with example usage: test_base_summary() without return types