code: def testSerialize(self):
      data = self.empty_message.SerializeToString()
  
      # Don't use assertEqual because we don't want to dump raw binary data to
      # stdout.
      self.assertTrue(data == self.all_fields_data)
  
imports: from google.protobuf import unittest_mset_pb2
  from google.protobuf import unittest_pb2
  from google.protobuf import unittest_proto3_arena_pb2
  from google.protobuf.internal import api_implementation
  from google.protobuf.internal import encoder
  from google.protobuf.internal import message_set_extensions_pb2
  from google.protobuf.internal import missing_enum_values_pb2
  from google.protobuf.internal import test_util
  from google.protobuf.internal import testing_refleaks
  from google.protobuf.internal import type_checkers
label_desc: Use image node_id 2 for calling the UnknownFieldsTest obj's underlying member method code with example usage: obj.testSerialize() without return types