class_docstr: Tests for TFRecordReader.
code: def testUncompressed(self):
      reader = genomics_reader.TFRecordReader(
          test_utils.genomics_core_testdata(
              "test_features.gff.tfrecord"
          ),
          gff_pb2.GffRecord(),
      )
      records = list(reader.iterate())
      self.assertEqual("GenBank", records[0].source)
      self.assertEqual("ctg123", records[1].range.reference_name)
      self.assertNotEqual(reader.c_reader, 0)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from absl.testing import absltest
  import six
  from third_party.nucleus.io import genomics_reader
  from third_party.nucleus.protos import gff_pb2
  from third_party.nucleus.testing import test_utils
label_desc: Use image node_id 1 for calling the TFRecordReaderTests obj's underlying member method code with example usage: obj.testUncompressed() without return types