code: def testNegativeInfinityPacked(self):
      golden_data = (
          "\xA2\x06\x04\x00\x00\x80\xFF"
          "\xAA\x06\x08\x00\x00\x00\x00\x00\x00\xF0\xFF"
      )
      golden_message = unittest_pb2.TestPackedTypes()
      golden_message.ParseFromString(golden_data)
      self.assertTrue(IsNegInf(golden_message.packed_float[0]))
      self.assertTrue(IsNegInf(golden_message.packed_double[0]))
      self.assertEqual(golden_data, golden_message.SerializeToString())
  
imports: import copy
  import math
  import operator
  import pickle
  import unittest
  from google.protobuf import unittest_import_pb2
  from google.protobuf import unittest_pb2
  from google.protobuf.internal import api_implementation
  from google.protobuf.internal import test_util
  from google.protobuf import message
label_desc: Use image node_id 11 for calling the MessageTest obj's underlying member method code with example usage: obj.testNegativeInfinityPacked() without return types