code: def test_version(self):
      version_str = get_niftynet_version_string()
      expected_string = "NiftyNet version "
      self.assertEqual(
          version_str[: len(expected_string)], expected_string
      )
  
      check_pep_440()
  
imports: from __future__ import absolute_import, print_function
  import tensorflow
  from niftynet.utilities.versioning import check_pep_440
  from niftynet.utilities.versioning import get_niftynet_version_string
  from tests.niftynet_testcase import NiftyNetTestCase
label_desc: Use image node_id 1 for calling the VersioningTest obj's underlying member method code with example usage: obj.test_version() without return types