reflection_test.py 文件源码

def testParseTruncated(self):
    # This test is only applicable for the Python implementation of the API.
    if api_implementation.Type() != 'python':
      return

    first_proto = unittest_pb2.TestAllTypes()
    test_util.SetAllFields(first_proto)
    serialized = first_proto.SerializeToString()

    for truncation_point in range(len(serialized) + 1):
      try:
        second_proto = unittest_pb2.TestAllTypes()
        unknown_fields = unittest_pb2.TestEmptyMessage()
        pos = second_proto._InternalParse(serialized, 0, truncation_point)
        # If we didn't raise an error then we read exactly the amount expected.
        self.assertEqual(truncation_point, pos)

        # Parsing to unknown fields should not throw if parsing to known fields
        # did not.
        try:
          pos2 = unknown_fields._InternalParse(serialized, 0, truncation_point)
          self.assertEqual(truncation_point, pos2)
        except message.DecodeError:
          self.fail('Parsing unknown fields failed when parsing known fields '
                    'did not.')
      except message.DecodeError:
        # Parsing unknown fields should also fail.
        self.assertRaises(message.DecodeError, unknown_fields._InternalParse,
                          serialized, 0, truncation_point)