code: def test_round_trip(self):
      def _ki_k(_x):
          return kolmogi(kolmogorov(_x))
  
      def _kci_kc(_x):
          return _kolmogci(_kolmogc(_x))
  
      x = np.linspace(0.0, 2.0, 21, endpoint=True)
      # Exclude 0.1, 0.2.  0.2 almost makes succeeds, but 0.1 has no chance.
      x02 = x[(x == 0) | (x > 0.21)]
      dataset02 = np.column_stack([x02, x02])
      FuncData(_ki_k, dataset02, (0,), 1, rtol=_rtol).check()
  
      dataset = np.column_stack([x, x])
      FuncData(_kci_kc, dataset, (0,), 1, rtol=_rtol).check()
  
imports: import itertools
  import sys
  import pytest
  import numpy
  from numpy.testing import assert_
  from scipy.special._testutils import FuncData
  from scipy.special import kolmogorov, kolmogi, smirnov, smirnovi
  from scipy.special._ufuncs import _kolmogc, _kolmogci, _kolmogp, _smirnovc, _smirnovci, _smirnovp
label_desc: Use image node_id 6 for calling the TestKolmogorov obj's underlying member method code with example usage: obj.test_round_trip() and returns: kolmogi, _kolmogci