code: def testPickleIncompleteProto(self):
      golden_message = unittest_pb2.TestRequired(a=1)
      pickled_message = pickle.dumps(golden_message)
  
      unpickled_message = pickle.loads(pickled_message)
      self.assertEquals(unpickled_message, golden_message)
      self.assertEquals(unpickled_message.a, 1)
      # This is still an incomplete proto - so serializing should fail
      self.assertRaises(
          message.EncodeError, unpickled_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 6 for calling the MessageTest obj's underlying member method code with example usage: obj.testPickleIncompleteProto() without return types