code: def test_gff_iterate(self, test_features_gff_filename):
      file_path = test_utils.genomics_core_testdata(
          test_features_gff_filename
      )
      with gff_reader.GffReader.from_file(
          file_path, self.options
      ) as reader:
          iterable = reader.iterate()
          self.assertIsInstance(
              iterable, clif_postproc.WrappedCppIterable
          )
          actual = list(iterable)
          self.assertLen(actual, 2)
          self.assertEqual(actual[0], self.first)
          self.assertEqual(actual[1], self.second)
  
file_path: deepvariant/third_party/nucleus/io/python/gff_reader_wrap_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import absltest
  from absl.testing import parameterized
  from third_party.nucleus.io import clif_postproc
  from third_party.nucleus.io.python import gff_reader
  from third_party.nucleus.protos import gff_pb2
  from third_party.nucleus.testing import test_utils
label_desc: Use image node_id 2 for calling the GffReaderTest obj's underlying member method code with example usage: obj.test_gff_iterate(test_features_gff_filename) without return types