code: def test_unique_reserved_info(self):
      num_reserved_info = len(vcf_constants.RESERVED_INFO_FIELDS)
      unique_info_ids = {
          info.id for info in vcf_constants.RESERVED_INFO_FIELDS
      }
      self.assertLen(unique_info_ids, num_reserved_info)
  
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.protos import variants_pb2
  from third_party.nucleus.util import struct_utils
  from third_party.nucleus.util import vcf_constants
label_desc: Use image node_id 2 for calling the VcfConstantsTest obj's underlying member method code with example usage: obj.test_unique_reserved_info() without return types