class_docstr: Tests for GenomicsReader.
code: def testIteration(self):
      dreader = DummyReader("10")
      self.assertEqual(list(range(10)), list(dreader))
  
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 GenomicsReaderTests obj's underlying member method code with example usage: obj.testIteration() without return types