class_docstr: Test the iteration functionality provided by io.SamReader.
code: def test_parsing_aux_tags(self, tag_string, expected_info):
      # Minimal header line to create a valid SAM file.
      reads = self._parse_read_with_aux_tags(tag_string)
      self.assertLen(reads, 1)
      self.assertInfoMapEqual(reads[0].info, expected_info)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import itertools
  from absl.testing import absltest
  from absl.testing import parameterized
  import six
  from etils import epath
  from third_party.nucleus.io import sam
  from third_party.nucleus.io import tfrecord
  from third_party.nucleus.protos import reads_pb2
  from third_party.nucleus.protos import reference_pb2
  from third_party.nucleus.testing import test_utils
  from third_party.nucleus.util import ranges
label_desc: Use image node_id 6 for calling the SamReaderTests obj's underlying member method code with example usage: obj.test_parsing_aux_tags(tag_string, expected_info) without return types