code: def test_evec(self):
      for col in range(self.evec_m.shape[1]):
          try:
              assert_almost_equal(
                  self.res.evec[:, col], self.evec_m[:, col]
              )
          except AssertionError:
              assert_almost_equal(
                  self.res.evec[:, col], -self.evec_m[:, col]
              )
  
imports: import os
  import warnings
  import numpy
  from numpy.testing import assert_almost_equal, assert_equal
  import pandas
  import pytest
  from statsmodels.tools.sm_exceptions import HypothesisTestWarning
  from statsmodels.tsa.vector_ar.vecm import coint_johansen
label_desc: Use image node_id 2 for calling the TestCointJoh12 obj's underlying member method code with example usage: obj.test_evec() without return types