python/google/protobuf/internal/message_test.py

#! /usr/bin/python
#
# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc.  All rights reserved.
# https://developers.google.com/protocol-buffers/
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Tests python protocol buffers against the golden message.

Note that the golden messages exercise every known field type, thus this
test ends up exercising and verifying nearly all of the parsing and
serialization code in the whole library.

TODO(kenton):  Merge with wire_format_test?  It doesn't make a whole lot of
sense to call this a test of the "message" module, which only declares an
abstract interface.
"""

__author__ = 'gps@google.com (Gregory P. Smith)'

import copy
import math
import operator
import pickle
import sys
import unittest

from google.apputils import basetest
from google.protobuf.internal import _parameterized
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 test_util
from google.protobuf import message

# Python pre-2.6 does not have isinf() or isnan() functions, so we have
# to provide our own.
def isnan(val):
  # NaN is never equal to itself.
  return val != val
def isinf(val):
  # Infinity times zero equals NaN.
  return not isnan(val) and isnan(val * 0)
def IsPosInf(val):
  return isinf(val) and (val > 0)
def IsNegInf(val):
  return isinf(val) and (val < 0)


@_parameterized.Parameters(
    (unittest_pb2),
    (unittest_proto3_arena_pb2))
class MessageTest(basetest.TestCase):

  def testBadUtf8String(self, message_module):
    if api_implementation.Type() != 'python':
      self.skipTest("Skipping testBadUtf8String, currently only the python "
                    "api implementation raises UnicodeDecodeError when a "
                    "string field contains bad utf-8.")
    bad_utf8_data = test_util.GoldenFileData('bad_utf8_string')
    with self.assertRaises(UnicodeDecodeError) as context:
      message_module.TestAllTypes.FromString(bad_utf8_data)
    self.assertIn('TestAllTypes.optional_string', str(context.exception))

  def testGoldenMessage(self, message_module):
    # Proto3 doesn't have the "default_foo" members or foreign enums,
    # and doesn't preserve unknown fields, so for proto3 we use a golden
    # message that doesn't have these fields set.
    if message_module is unittest_pb2:
      golden_data = test_util.GoldenFileData(
          'golden_message_oneof_implemented')
    else:
      golden_data = test_util.GoldenFileData('golden_message_proto3')

    golden_message = message_module.TestAllTypes()
    golden_message.ParseFromString(golden_data)
    if message_module is unittest_pb2:
      test_util.ExpectAllFieldsSet(self, golden_message)
    self.assertEqual(golden_data, golden_message.SerializeToString())
    golden_copy = copy.deepcopy(golden_message)
    self.assertEqual(golden_data, golden_copy.SerializeToString())

  def testGoldenPackedMessage(self, message_module):
    golden_data = test_util.GoldenFileData('golden_packed_fields_message')
    golden_message = message_module.TestPackedTypes()
    golden_message.ParseFromString(golden_data)
    all_set = message_module.TestPackedTypes()
    test_util.SetAllPackedFields(all_set)
    self.assertEqual(all_set, golden_message)
    self.assertEqual(golden_data, all_set.SerializeToString())
    golden_copy = copy.deepcopy(golden_message)
    self.assertEqual(golden_data, golden_copy.SerializeToString())

  def testPickleSupport(self, message_module):
    golden_data = test_util.GoldenFileData('golden_message')
    golden_message = message_module.TestAllTypes()
    golden_message.ParseFromString(golden_data)
    pickled_message = pickle.dumps(golden_message)

    unpickled_message = pickle.loads(pickled_message)
    self.assertEqual(unpickled_message, golden_message)

  def testPositiveInfinity(self, message_module):
    golden_data = (b'\x5D\x00\x00\x80\x7F'
                   b'\x61\x00\x00\x00\x00\x00\x00\xF0\x7F'
                   b'\xCD\x02\x00\x00\x80\x7F'
                   b'\xD1\x02\x00\x00\x00\x00\x00\x00\xF0\x7F')
    golden_message = message_module.TestAllTypes()
    golden_message.ParseFromString(golden_data)
    self.assertTrue(IsPosInf(golden_message.optional_float))
    self.assertTrue(IsPosInf(golden_message.optional_double))
    self.assertTrue(IsPosInf(golden_message.repeated_float[0]))
    self.assertTrue(IsPosInf(golden_message.repeated_double[0]))
    self.assertEqual(golden_data, golden_message.SerializeToString())

  def testNegativeInfinity(self, message_module):
    golden_data = (b'\x5D\x00\x00\x80\xFF'
                   b'\x61\x00\x00\x00\x00\x00\x00\xF0\xFF'
                   b'\xCD\x02\x00\x00\x80\xFF'
                   b'\xD1\x02\x00\x00\x00\x00\x00\x00\xF0\xFF')
    golden_message = message_module.TestAllTypes()
    golden_message.ParseFromString(golden_data)
    self.assertTrue(IsNegInf(golden_message.optional_float))
    self.assertTrue(IsNegInf(golden_message.optional_double))
    self.assertTrue(IsNegInf(golden_message.repeated_float[0]))
    self.assertTrue(IsNegInf(golden_message.repeated_double[0]))
    self.assertEqual(golden_data, golden_message.SerializeToString())

  def testNotANumber(self, message_module):
    golden_data = (b'\x5D\x00\x00\xC0\x7F'
                   b'\x61\x00\x00\x00\x00\x00\x00\xF8\x7F'
                   b'\xCD\x02\x00\x00\xC0\x7F'
                   b'\xD1\x02\x00\x00\x00\x00\x00\x00\xF8\x7F')
    golden_message = message_module.TestAllTypes()
    golden_message.ParseFromString(golden_data)
    self.assertTrue(isnan(golden_message.optional_float))
    self.assertTrue(isnan(golden_message.optional_double))
    self.assertTrue(isnan(golden_message.repeated_float[0]))
    self.assertTrue(isnan(golden_message.repeated_double[0]))

    # The protocol buffer may serialize to any one of multiple different
    # representations of a NaN.  Rather than verify a specific representation,
    # verify the serialized string can be converted into a correctly
    # behaving protocol buffer.
    serialized = golden_message.SerializeToString()
    message = message_module.TestAllTypes()
    message.ParseFromString(serialized)
    self.assertTrue(isnan(message.optional_float))
    self.assertTrue(isnan(message.optional_double))
    self.assertTrue(isnan(message.repeated_float[0]))
    self.assertTrue(isnan(message.repeated_double[0]))

  def testPositiveInfinityPacked(self, message_module):
    golden_data = (b'\xA2\x06\x04\x00\x00\x80\x7F'
                   b'\xAA\x06\x08\x00\x00\x00\x00\x00\x00\xF0\x7F')
    golden_message = message_module.TestPackedTypes()
    golden_message.ParseFromString(golden_data)
    self.assertTrue(IsPosInf(golden_message.packed_float[0]))
    self.assertTrue(IsPosInf(golden_message.packed_double[0]))
    self.assertEqual(golden_data, golden_message.SerializeToString())

  def testNegativeInfinityPacked(self, message_module):
    golden_data = (b'\xA2\x06\x04\x00\x00\x80\xFF'
                   b'\xAA\x06\x08\x00\x00\x00\x00\x00\x00\xF0\xFF')
    golden_message = message_module.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())

  def testNotANumberPacked(self, message_module):
    golden_data = (b'\xA2\x06\x04\x00\x00\xC0\x7F'
                   b'\xAA\x06\x08\x00\x00\x00\x00\x00\x00\xF8\x7F')
    golden_message = message_module.TestPackedTypes()
    golden_message.ParseFromString(golden_data)
    self.assertTrue(isnan(golden_message.packed_float[0]))
    self.assertTrue(isnan(golden_message.packed_double[0]))

    serialized = golden_message.SerializeToString()
    message = message_module.TestPackedTypes()
    message.ParseFromString(serialized)
    self.assertTrue(isnan(message.packed_float[0]))
    self.assertTrue(isnan(message.packed_double[0]))

  def testExtremeFloatValues(self, message_module):
    message = message_module.TestAllTypes()

    # Most positive exponent, no significand bits set.
    kMostPosExponentNoSigBits = math.pow(2, 127)
    message.optional_float = kMostPosExponentNoSigBits
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_float == kMostPosExponentNoSigBits)

    # Most positive exponent, one significand bit set.
    kMostPosExponentOneSigBit = 1.5 * math.pow(2, 127)
    message.optional_float = kMostPosExponentOneSigBit
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_float == kMostPosExponentOneSigBit)

    # Repeat last two cases with values of same magnitude, but negative.
    message.optional_float = -kMostPosExponentNoSigBits
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_float == -kMostPosExponentNoSigBits)

    message.optional_float = -kMostPosExponentOneSigBit
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_float == -kMostPosExponentOneSigBit)

    # Most negative exponent, no significand bits set.
    kMostNegExponentNoSigBits = math.pow(2, -127)
    message.optional_float = kMostNegExponentNoSigBits
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_float == kMostNegExponentNoSigBits)

    # Most negative exponent, one significand bit set.
    kMostNegExponentOneSigBit = 1.5 * math.pow(2, -127)
    message.optional_float = kMostNegExponentOneSigBit
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_float == kMostNegExponentOneSigBit)

    # Repeat last two cases with values of the same magnitude, but negative.
    message.optional_float = -kMostNegExponentNoSigBits
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_float == -kMostNegExponentNoSigBits)

    message.optional_float = -kMostNegExponentOneSigBit
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_float == -kMostNegExponentOneSigBit)

  def testExtremeDoubleValues(self, message_module):
    message = message_module.TestAllTypes()

    # Most positive exponent, no significand bits set.
    kMostPosExponentNoSigBits = math.pow(2, 1023)
    message.optional_double = kMostPosExponentNoSigBits
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_double == kMostPosExponentNoSigBits)

    # Most positive exponent, one significand bit set.
    kMostPosExponentOneSigBit = 1.5 * math.pow(2, 1023)
    message.optional_double = kMostPosExponentOneSigBit
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_double == kMostPosExponentOneSigBit)

    # Repeat last two cases with values of same magnitude, but negative.
    message.optional_double = -kMostPosExponentNoSigBits
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_double == -kMostPosExponentNoSigBits)

    message.optional_double = -kMostPosExponentOneSigBit
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_double == -kMostPosExponentOneSigBit)

    # Most negative exponent, no significand bits set.
    kMostNegExponentNoSigBits = math.pow(2, -1023)
    message.optional_double = kMostNegExponentNoSigBits
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_double == kMostNegExponentNoSigBits)

    # Most negative exponent, one significand bit set.
    kMostNegExponentOneSigBit = 1.5 * math.pow(2, -1023)
    message.optional_double = kMostNegExponentOneSigBit
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_double == kMostNegExponentOneSigBit)

    # Repeat last two cases with values of the same magnitude, but negative.
    message.optional_double = -kMostNegExponentNoSigBits
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_double == -kMostNegExponentNoSigBits)

    message.optional_double = -kMostNegExponentOneSigBit
    message.ParseFromString(message.SerializeToString())
    self.assertTrue(message.optional_double == -kMostNegExponentOneSigBit)

  def testFloatPrinting(self, message_module):
    message = message_module.TestAllTypes()
    message.optional_float = 2.0
    self.assertEqual(str(message), 'optional_float: 2.0\n')

  def testHighPrecisionFloatPrinting(self, message_module):
    message = message_module.TestAllTypes()
    message.optional_double = 0.12345678912345678
    if sys.version_info.major >= 3:
      self.assertEqual(str(message), 'optional_double: 0.12345678912345678\n')
    else:
      self.assertEqual(str(message), 'optional_double: 0.123456789123\n')

  def testUnknownFieldPrinting(self, message_module):
    populated = message_module.TestAllTypes()
    test_util.SetAllNonLazyFields(populated)
    empty = message_module.TestEmptyMessage()
    empty.ParseFromString(populated.SerializeToString())
    self.assertEqual(str(empty), '')

  def testRepeatedNestedFieldIteration(self, message_module):
    msg = message_module.TestAllTypes()
    msg.repeated_nested_message.add(bb=1)
    msg.repeated_nested_message.add(bb=2)
    msg.repeated_nested_message.add(bb=3)
    msg.repeated_nested_message.add(bb=4)

    self.assertEqual([1, 2, 3, 4],
                     [m.bb for m in msg.repeated_nested_message])
    self.assertEqual([4, 3, 2, 1],
                     [m.bb for m in reversed(msg.repeated_nested_message)])
    self.assertEqual([4, 3, 2, 1],
                     [m.bb for m in msg.repeated_nested_message[::-1]])

  def testSortingRepeatedScalarFieldsDefaultComparator(self, message_module):
    """Check some different types with the default comparator."""
    message = message_module.TestAllTypes()

    # TODO(mattp): would testing more scalar types strengthen test?
    message.repeated_int32.append(1)
    message.repeated_int32.append(3)
    message.repeated_int32.append(2)
    message.repeated_int32.sort()
    self.assertEqual(message.repeated_int32[0], 1)
    self.assertEqual(message.repeated_int32[1], 2)
    self.assertEqual(message.repeated_int32[2], 3)

    message.repeated_float.append(1.1)
    message.repeated_float.append(1.3)
    message.repeated_float.append(1.2)
    message.repeated_float.sort()
    self.assertAlmostEqual(message.repeated_float[0], 1.1)
    self.assertAlmostEqual(message.repeated_float[1], 1.2)
    self.assertAlmostEqual(message.repeated_float[2], 1.3)

    message.repeated_string.append('a')
    message.repeated_string.append('c')
    message.repeated_string.append('b')
    message.repeated_string.sort()
    self.assertEqual(message.repeated_string[0], 'a')
    self.assertEqual(message.repeated_string[1], 'b')
    self.assertEqual(message.repeated_string[2], 'c')

    message.repeated_bytes.append(b'a')
    message.repeated_bytes.append(b'c')
    message.repeated_bytes.append(b'b')
    message.repeated_bytes.sort()
    self.assertEqual(message.repeated_bytes[0], b'a')
    self.assertEqual(message.repeated_bytes[1], b'b')
    self.assertEqual(message.repeated_bytes[2], b'c')

  def testSortingRepeatedScalarFieldsCustomComparator(self, message_module):
    """Check some different types with custom comparator."""
    message = message_module.TestAllTypes()

    message.repeated_int32.append(-3)
    message.repeated_int32.append(-2)
    message.repeated_int32.append(-1)
    message.repeated_int32.sort(key=abs)
    self.assertEqual(message.repeated_int32[0], -1)
    self.assertEqual(message.repeated_int32[1], -2)
    self.assertEqual(message.repeated_int32[2], -3)

    message.repeated_string.append('aaa')
    message.repeated_string.append('bb')
    message.repeated_string.append('c')
    message.repeated_string.sort(key=len)
    self.assertEqual(message.repeated_string[0], 'c')
    self.assertEqual(message.repeated_string[1], 'bb')
    self.assertEqual(message.repeated_string[2], 'aaa')

  def testSortingRepeatedCompositeFieldsCustomComparator(self, message_module):
    """Check passing a custom comparator to sort a repeated composite field."""
    message = message_module.TestAllTypes()

    message.repeated_nested_message.add().bb = 1
    message.repeated_nested_message.add().bb = 3
    message.repeated_nested_message.add().bb = 2
    message.repeated_nested_message.add().bb = 6
    message.repeated_nested_message.add().bb = 5
    message.repeated_nested_message.add().bb = 4
    message.repeated_nested_message.sort(key=operator.attrgetter('bb'))
    self.assertEqual(message.repeated_nested_message[0].bb, 1)
    self.assertEqual(message.repeated_nested_message[1].bb, 2)
    self.assertEqual(message.repeated_nested_message[2].bb, 3)
    self.assertEqual(message.repeated_nested_message[3].bb, 4)
    self.assertEqual(message.repeated_nested_message[4].bb, 5)
    self.assertEqual(message.repeated_nested_message[5].bb, 6)

  def testRepeatedCompositeFieldSortArguments(self, message_module):
    """Check sorting a repeated composite field using list.sort() arguments."""
    message = message_module.TestAllTypes()

    get_bb = operator.attrgetter('bb')
    cmp_bb = lambda a, b: cmp(a.bb, b.bb)
    message.repeated_nested_message.add().bb = 1
    message.repeated_nested_message.add().bb = 3
    message.repeated_nested_message.add().bb = 2
    message.repeated_nested_message.add().bb = 6
    message.repeated_nested_message.add().bb = 5
    message.repeated_nested_message.add().bb = 4
    message.repeated_nested_message.sort(key=get_bb)
    self.assertEqual([k.bb for k in message.repeated_nested_message],
                     [1, 2, 3, 4, 5, 6])
    message.repeated_nested_message.sort(key=get_bb, reverse=True)
    self.assertEqual([k.bb for k in message.repeated_nested_message],
                     [6, 5, 4, 3, 2, 1])
    if sys.version_info.major >= 3: return  # No cmp sorting in PY3.
    message.repeated_nested_message.sort(sort_function=cmp_bb)
    self.assertEqual([k.bb for k in message.repeated_nested_message],
                     [1, 2, 3, 4, 5, 6])
    message.repeated_nested_message.sort(cmp=cmp_bb, reverse=True)
    self.assertEqual([k.bb for k in message.repeated_nested_message],
                     [6, 5, 4, 3, 2, 1])

  def testRepeatedScalarFieldSortArguments(self, message_module):
    """Check sorting a scalar field using list.sort() arguments."""
    message = message_module.TestAllTypes()

    message.repeated_int32.append(-3)
    message.repeated_int32.append(-2)
    message.repeated_int32.append(-1)
    message.repeated_int32.sort(key=abs)
    self.assertEqual(list(message.repeated_int32), [-1, -2, -3])
    message.repeated_int32.sort(key=abs, reverse=True)
    self.assertEqual(list(message.repeated_int32), [-3, -2, -1])
    if sys.version_info.major < 3:  # No cmp sorting in PY3.
      abs_cmp = lambda a, b: cmp(abs(a), abs(b))
      message.repeated_int32.sort(sort_function=abs_cmp)
      self.assertEqual(list(message.repeated_int32), [-1, -2, -3])
      message.repeated_int32.sort(cmp=abs_cmp, reverse=True)
      self.assertEqual(list(message.repeated_int32), [-3, -2, -1])

    message.repeated_string.append('aaa')
    message.repeated_string.append('bb')
    message.repeated_string.append('c')
    message.repeated_string.sort(key=len)
    self.assertEqual(list(message.repeated_string), ['c', 'bb', 'aaa'])
    message.repeated_string.sort(key=len, reverse=True)
    self.assertEqual(list(message.repeated_string), ['aaa', 'bb', 'c'])
    if sys.version_info.major < 3:  # No cmp sorting in PY3.
      len_cmp = lambda a, b: cmp(len(a), len(b))
      message.repeated_string.sort(sort_function=len_cmp)
      self.assertEqual(list(message.repeated_string), ['c', 'bb', 'aaa'])
      message.repeated_string.sort(cmp=len_cmp, reverse=True)
      self.assertEqual(list(message.repeated_string), ['aaa', 'bb', 'c'])

  def testRepeatedFieldsComparable(self, message_module):
    m1 = message_module.TestAllTypes()
    m2 = message_module.TestAllTypes()
    m1.repeated_int32.append(0)
    m1.repeated_int32.append(1)
    m1.repeated_int32.append(2)
    m2.repeated_int32.append(0)
    m2.repeated_int32.append(1)
    m2.repeated_int32.append(2)
    m1.repeated_nested_message.add().bb = 1
    m1.repeated_nested_message.add().bb = 2
    m1.repeated_nested_message.add().bb = 3
    m2.repeated_nested_message.add().bb = 1
    m2.repeated_nested_message.add().bb = 2
    m2.repeated_nested_message.add().bb = 3

    if sys.version_info.major >= 3: return  # No cmp() in PY3.

    # These comparisons should not raise errors.
    _ = m1 < m2
    _ = m1.repeated_nested_message < m2.repeated_nested_message

    # Make sure cmp always works. If it wasn't defined, these would be
    # id() comparisons and would all fail.
    self.assertEqual(cmp(m1, m2), 0)
    self.assertEqual(cmp(m1.repeated_int32, m2.repeated_int32), 0)
    self.assertEqual(cmp(m1.repeated_int32, [0, 1, 2]), 0)
    self.assertEqual(cmp(m1.repeated_nested_message,
                         m2.repeated_nested_message), 0)
    with self.assertRaises(TypeError):
      # Can't compare repeated composite containers to lists.
      cmp(m1.repeated_nested_message, m2.repeated_nested_message[:])

    # TODO(anuraag): Implement extensiondict comparison in C++ and then add test

  def ensureNestedMessageExists(self, msg, attribute):
    """Make sure that a nested message object exists.

    As soon as a nested message attribute is accessed, it will be present in the
    _fields dict, without being marked as actually being set.
    """
    getattr(msg, attribute)
    self.assertFalse(msg.HasField(attribute))

  def testOneofGetCaseNonexistingField(self, message_module):
    m = message_module.TestAllTypes()
    self.assertRaises(ValueError, m.WhichOneof, 'no_such_oneof_field')

  def testOneofDefaultValues(self, message_module):
    m = message_module.TestAllTypes()
    self.assertIs(None, m.WhichOneof('oneof_field'))
    self.assertFalse(m.HasField('oneof_uint32'))

    # Oneof is set even when setting it to a default value.
    m.oneof_uint32 = 0
    self.assertEqual('oneof_uint32', m.WhichOneof('oneof_field'))
    self.assertTrue(m.HasField('oneof_uint32'))
    self.assertFalse(m.HasField('oneof_string'))

    m.oneof_string = ""
    self.assertEqual('oneof_string', m.WhichOneof('oneof_field'))
    self.assertTrue(m.HasField('oneof_string'))
    self.assertFalse(m.HasField('oneof_uint32'))

  def testOneofSemantics(self, message_module):
    m = message_module.TestAllTypes()
    self.assertIs(None, m.WhichOneof('oneof_field'))

    m.oneof_uint32 = 11
    self.assertEqual('oneof_uint32', m.WhichOneof('oneof_field'))
    self.assertTrue(m.HasField('oneof_uint32'))

    m.oneof_string = u'foo'
    self.assertEqual('oneof_string', m.WhichOneof('oneof_field'))
    self.assertFalse(m.HasField('oneof_uint32'))
    self.assertTrue(m.HasField('oneof_string'))

    m.oneof_nested_message.bb = 11
    self.assertEqual('oneof_nested_message', m.WhichOneof('oneof_field'))
    self.assertFalse(m.HasField('oneof_string'))
    self.assertTrue(m.HasField('oneof_nested_message'))

    m.oneof_bytes = b'bb'
    self.assertEqual('oneof_bytes', m.WhichOneof('oneof_field'))
    self.assertFalse(m.HasField('oneof_nested_message'))
    self.assertTrue(m.HasField('oneof_bytes'))

  def testOneofCompositeFieldReadAccess(self, message_module):
    m = message_module.TestAllTypes()
    m.oneof_uint32 = 11

    self.ensureNestedMessageExists(m, 'oneof_nested_message')
    self.assertEqual('oneof_uint32', m.WhichOneof('oneof_field'))
    self.assertEqual(11, m.oneof_uint32)

  def testOneofWhichOneof(self, message_module):
    m = message_module.TestAllTypes()
    self.assertIs(None, m.WhichOneof('oneof_field'))
    if message_module is unittest_pb2:
      self.assertFalse(m.HasField('oneof_field'))

    m.oneof_uint32 = 11
    self.assertEqual('oneof_uint32', m.WhichOneof('oneof_field'))
    if message_module is unittest_pb2:
      self.assertTrue(m.HasField('oneof_field'))

    m.oneof_bytes = b'bb'
    self.assertEqual('oneof_bytes', m.WhichOneof('oneof_field'))

    m.ClearField('oneof_bytes')
    self.assertIs(None, m.WhichOneof('oneof_field'))
    if message_module is unittest_pb2:
      self.assertFalse(m.HasField('oneof_field'))

  def testOneofClearField(self, message_module):
    m = message_module.TestAllTypes()
    m.oneof_uint32 = 11
    m.ClearField('oneof_field')
    if message_module is unittest_pb2:
      self.assertFalse(m.HasField('oneof_field'))
    self.assertFalse(m.HasField('oneof_uint32'))
    self.assertIs(None, m.WhichOneof('oneof_field'))

  def testOneofClearSetField(self, message_module):
    m = message_module.TestAllTypes()
    m.oneof_uint32 = 11
    m.ClearField('oneof_uint32')
    if message_module is unittest_pb2:
      self.assertFalse(m.HasField('oneof_field'))
    self.assertFalse(m.HasField('oneof_uint32'))
    self.assertIs(None, m.WhichOneof('oneof_field'))

  def testOneofClearUnsetField(self, message_module):
    m = message_module.TestAllTypes()
    m.oneof_uint32 = 11
    self.ensureNestedMessageExists(m, 'oneof_nested_message')
    m.ClearField('oneof_nested_message')
    self.assertEqual(11, m.oneof_uint32)
    if message_module is unittest_pb2:
      self.assertTrue(m.HasField('oneof_field'))
    self.assertTrue(m.HasField('oneof_uint32'))
    self.assertEqual('oneof_uint32', m.WhichOneof('oneof_field'))

  def testOneofDeserialize(self, message_module):
    m = message_module.TestAllTypes()
    m.oneof_uint32 = 11
    m2 = message_module.TestAllTypes()
    m2.ParseFromString(m.SerializeToString())
    self.assertEqual('oneof_uint32', m2.WhichOneof('oneof_field'))

  def testOneofCopyFrom(self, message_module):
    m = message_module.TestAllTypes()
    m.oneof_uint32 = 11
    m2 = message_module.TestAllTypes()
    m2.CopyFrom(m)
    self.assertEqual('oneof_uint32', m2.WhichOneof('oneof_field'))

  def testOneofNestedMergeFrom(self, message_module):
    m = message_module.NestedTestAllTypes()
    m.payload.oneof_uint32 = 11
    m2 = message_module.NestedTestAllTypes()
    m2.payload.oneof_bytes = b'bb'
    m2.child.payload.oneof_bytes = b'bb'
    m2.MergeFrom(m)
    self.assertEqual('oneof_uint32', m2.payload.WhichOneof('oneof_field'))
    self.assertEqual('oneof_bytes', m2.child.payload.WhichOneof('oneof_field'))

  def testOneofMessageMergeFrom(self, message_module):
    m = message_module.NestedTestAllTypes()
    m.payload.oneof_nested_message.bb = 11
    m.child.payload.oneof_nested_message.bb = 12
    m2 = message_module.NestedTestAllTypes()
    m2.payload.oneof_uint32 = 13
    m2.MergeFrom(m)
    self.assertEqual('oneof_nested_message',
                     m2.payload.WhichOneof('oneof_field'))
    self.assertEqual('oneof_nested_message',
                     m2.child.payload.WhichOneof('oneof_field'))

  def testOneofNestedMessageInit(self, message_module):
    m = message_module.TestAllTypes(
        oneof_nested_message=message_module.TestAllTypes.NestedMessage())
    self.assertEqual('oneof_nested_message', m.WhichOneof('oneof_field'))

  def testOneofClear(self, message_module):
    m = message_module.TestAllTypes()
    m.oneof_uint32 = 11
    m.Clear()
    self.assertIsNone(m.WhichOneof('oneof_field'))
    m.oneof_bytes = b'bb'
    self.assertEqual('oneof_bytes', m.WhichOneof('oneof_field'))

  def testAssignByteStringToUnicodeField(self, message_module):
    """Assigning a byte string to a string field should result
    in the value being converted to a Unicode string."""
    m = message_module.TestAllTypes()
    m.optional_string = str('')
    self.assertTrue(isinstance(m.optional_string, unicode))

# TODO(haberman): why are these tests Google-internal only?

  def testLongValuedSlice(self, message_module):
    """It should be possible to use long-valued indicies in slices

    This didn't used to work in the v2 C++ implementation.
    """
    m = message_module.TestAllTypes()

    # Repeated scalar
    m.repeated_int32.append(1)
    sl = m.repeated_int32[long(0):long(len(m.repeated_int32))]
    self.assertEqual(len(m.repeated_int32), len(sl))

    # Repeated composite
    m.repeated_nested_message.add().bb = 3
    sl = m.repeated_nested_message[long(0):long(len(m.repeated_nested_message))]
    self.assertEqual(len(m.repeated_nested_message), len(sl))

  def testExtendShouldNotSwallowExceptions(self, message_module):
    """This didn't use to work in the v2 C++ implementation."""
    m = message_module.TestAllTypes()
    with self.assertRaises(NameError) as _:
      m.repeated_int32.extend(a for i in range(10))  # pylint: disable=undefined-variable
    with self.assertRaises(NameError) as _:
      m.repeated_nested_enum.extend(
          a for i in range(10))  # pylint: disable=undefined-variable

  FALSY_VALUES = [None, False, 0, 0.0, b'', u'', bytearray(), [], {}, set()]

  def testExtendInt32WithNothing(self, message_module):
    """Test no-ops extending repeated int32 fields."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_int32)

    # TODO(ptucker): Deprecate this behavior. b/18413862
    for falsy_value in MessageTest.FALSY_VALUES:
      m.repeated_int32.extend(falsy_value)
      self.assertSequenceEqual([], m.repeated_int32)

    m.repeated_int32.extend([])
    self.assertSequenceEqual([], m.repeated_int32)

  def testExtendFloatWithNothing(self, message_module):
    """Test no-ops extending repeated float fields."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_float)

    # TODO(ptucker): Deprecate this behavior. b/18413862
    for falsy_value in MessageTest.FALSY_VALUES:
      m.repeated_float.extend(falsy_value)
      self.assertSequenceEqual([], m.repeated_float)

    m.repeated_float.extend([])
    self.assertSequenceEqual([], m.repeated_float)

  def testExtendStringWithNothing(self, message_module):
    """Test no-ops extending repeated string fields."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_string)

    # TODO(ptucker): Deprecate this behavior. b/18413862
    for falsy_value in MessageTest.FALSY_VALUES:
      m.repeated_string.extend(falsy_value)
      self.assertSequenceEqual([], m.repeated_string)

    m.repeated_string.extend([])
    self.assertSequenceEqual([], m.repeated_string)

  def testExtendInt32WithPythonList(self, message_module):
    """Test extending repeated int32 fields with python lists."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_int32)
    m.repeated_int32.extend([0])
    self.assertSequenceEqual([0], m.repeated_int32)
    m.repeated_int32.extend([1, 2])
    self.assertSequenceEqual([0, 1, 2], m.repeated_int32)
    m.repeated_int32.extend([3, 4])
    self.assertSequenceEqual([0, 1, 2, 3, 4], m.repeated_int32)

  def testExtendFloatWithPythonList(self, message_module):
    """Test extending repeated float fields with python lists."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_float)
    m.repeated_float.extend([0.0])
    self.assertSequenceEqual([0.0], m.repeated_float)
    m.repeated_float.extend([1.0, 2.0])
    self.assertSequenceEqual([0.0, 1.0, 2.0], m.repeated_float)
    m.repeated_float.extend([3.0, 4.0])
    self.assertSequenceEqual([0.0, 1.0, 2.0, 3.0, 4.0], m.repeated_float)

  def testExtendStringWithPythonList(self, message_module):
    """Test extending repeated string fields with python lists."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_string)
    m.repeated_string.extend([''])
    self.assertSequenceEqual([''], m.repeated_string)
    m.repeated_string.extend(['11', '22'])
    self.assertSequenceEqual(['', '11', '22'], m.repeated_string)
    m.repeated_string.extend(['33', '44'])
    self.assertSequenceEqual(['', '11', '22', '33', '44'], m.repeated_string)

  def testExtendStringWithString(self, message_module):
    """Test extending repeated string fields with characters from a string."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_string)
    m.repeated_string.extend('abc')
    self.assertSequenceEqual(['a', 'b', 'c'], m.repeated_string)

  class TestIterable(object):
    """This iterable object mimics the behavior of numpy.array.

    __nonzero__ fails for length > 1, and returns bool(item[0]) for length == 1.

    """

    def __init__(self, values=None):
      self._list = values or []

    def __nonzero__(self):
      size = len(self._list)
      if size == 0:
        return False
      if size == 1:
        return bool(self._list[0])
      raise ValueError('Truth value is ambiguous.')

    def __len__(self):
      return len(self._list)

    def __iter__(self):
      return self._list.__iter__()

  def testExtendInt32WithIterable(self, message_module):
    """Test extending repeated int32 fields with iterable."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_int32)
    m.repeated_int32.extend(MessageTest.TestIterable([]))
    self.assertSequenceEqual([], m.repeated_int32)
    m.repeated_int32.extend(MessageTest.TestIterable([0]))
    self.assertSequenceEqual([0], m.repeated_int32)
    m.repeated_int32.extend(MessageTest.TestIterable([1, 2]))
    self.assertSequenceEqual([0, 1, 2], m.repeated_int32)
    m.repeated_int32.extend(MessageTest.TestIterable([3, 4]))
    self.assertSequenceEqual([0, 1, 2, 3, 4], m.repeated_int32)

  def testExtendFloatWithIterable(self, message_module):
    """Test extending repeated float fields with iterable."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_float)
    m.repeated_float.extend(MessageTest.TestIterable([]))
    self.assertSequenceEqual([], m.repeated_float)
    m.repeated_float.extend(MessageTest.TestIterable([0.0]))
    self.assertSequenceEqual([0.0], m.repeated_float)
    m.repeated_float.extend(MessageTest.TestIterable([1.0, 2.0]))
    self.assertSequenceEqual([0.0, 1.0, 2.0], m.repeated_float)
    m.repeated_float.extend(MessageTest.TestIterable([3.0, 4.0]))
    self.assertSequenceEqual([0.0, 1.0, 2.0, 3.0, 4.0], m.repeated_float)

  def testExtendStringWithIterable(self, message_module):
    """Test extending repeated string fields with iterable."""
    m = message_module.TestAllTypes()
    self.assertSequenceEqual([], m.repeated_string)
    m.repeated_string.extend(MessageTest.TestIterable([]))
    self.assertSequenceEqual([], m.repeated_string)
    m.repeated_string.extend(MessageTest.TestIterable(['']))
    self.assertSequenceEqual([''], m.repeated_string)
    m.repeated_string.extend(MessageTest.TestIterable(['1', '2']))
    self.assertSequenceEqual(['', '1', '2'], m.repeated_string)
    m.repeated_string.extend(MessageTest.TestIterable(['3', '4']))
    self.assertSequenceEqual(['', '1', '2', '3', '4'], m.repeated_string)

  def testPickleRepeatedScalarContainer(self, message_module):
    # TODO(tibell): The pure-Python implementation support pickling of
    #   scalar containers in *some* cases. For now the cpp2 version
    #   throws an exception to avoid a segfault. Investigate if we
    #   want to support pickling of these fields.
    #
    # For more information see: https://b2.corp.google.com/u/0/issues/18677897
    if (api_implementation.Type() != 'cpp' or
        api_implementation.Version() == 2):
      return
    m = message_module.TestAllTypes()
    with self.assertRaises(pickle.PickleError) as _:
      pickle.dumps(m.repeated_int32, pickle.HIGHEST_PROTOCOL)


  def testSortEmptyRepeatedCompositeContainer(self, message_module):
    """Exercise a scenario that has led to segfaults in the past.
    """
    m = message_module.TestAllTypes()
    m.repeated_nested_message.sort()

  def testHasFieldOnRepeatedField(self, message_module):
    """Using HasField on a repeated field should raise an exception.
    """
    m = message_module.TestAllTypes()
    with self.assertRaises(ValueError) as _:
      m.HasField('repeated_int32')

  def testRepeatedScalarFieldPop(self, message_module):
    m = message_module.TestAllTypes()
    with self.assertRaises(IndexError) as _:
      m.repeated_int32.pop()
    m.repeated_int32.extend(range(5))
    self.assertEqual(4, m.repeated_int32.pop())
    self.assertEqual(0, m.repeated_int32.pop(0))
    self.assertEqual(2, m.repeated_int32.pop(1))
    self.assertEqual([1, 3], m.repeated_int32)

  def testRepeatedCompositeFieldPop(self, message_module):
    m = message_module.TestAllTypes()
    with self.assertRaises(IndexError) as _:
      m.repeated_nested_message.pop()
    for i in range(5):
      n = m.repeated_nested_message.add()
      n.bb = i
    self.assertEqual(4, m.repeated_nested_message.pop().bb)
    self.assertEqual(0, m.repeated_nested_message.pop(0).bb)
    self.assertEqual(2, m.repeated_nested_message.pop(1).bb)
    self.assertEqual([1, 3], [n.bb for n in m.repeated_nested_message])


# Class to test proto2-only features (required, extensions, etc.)
class Proto2Test(basetest.TestCase):

  def testFieldPresence(self):
    message = unittest_pb2.TestAllTypes()

    self.assertFalse(message.HasField("optional_int32"))
    self.assertFalse(message.HasField("optional_bool"))
    self.assertFalse(message.HasField("optional_nested_message"))

    with self.assertRaises(ValueError):
      message.HasField("field_doesnt_exist")

    with self.assertRaises(ValueError):
      message.HasField("repeated_int32")
    with self.assertRaises(ValueError):
      message.HasField("repeated_nested_message")

    self.assertEqual(0, message.optional_int32)
    self.assertEqual(False, message.optional_bool)
    self.assertEqual(0, message.optional_nested_message.bb)

    # Fields are set even when setting the values to default values.
    message.optional_int32 = 0
    message.optional_bool = False
    message.optional_nested_message.bb = 0
    self.assertTrue(message.HasField("optional_int32"))
    self.assertTrue(message.HasField("optional_bool"))
    self.assertTrue(message.HasField("optional_nested_message"))

    # Set the fields to non-default values.
    message.optional_int32 = 5
    message.optional_bool = True
    message.optional_nested_message.bb = 15

    self.assertTrue(message.HasField("optional_int32"))
    self.assertTrue(message.HasField("optional_bool"))
    self.assertTrue(message.HasField("optional_nested_message"))

    # Clearing the fields unsets them and resets their value to default.
    message.ClearField("optional_int32")
    message.ClearField("optional_bool")
    message.ClearField("optional_nested_message")

    self.assertFalse(message.HasField("optional_int32"))
    self.assertFalse(message.HasField("optional_bool"))
    self.assertFalse(message.HasField("optional_nested_message"))
    self.assertEqual(0, message.optional_int32)
    self.assertEqual(False, message.optional_bool)
    self.assertEqual(0, message.optional_nested_message.bb)

  # TODO(tibell): The C++ implementations actually allows assignment
  # of unknown enum values to *scalar* fields (but not repeated
  # fields). Once checked enum fields becomes the default in the
  # Python implementation, the C++ implementation should follow suit.
  def testAssignInvalidEnum(self):
    """It should not be possible to assign an invalid enum number to an
    enum field."""
    m = unittest_pb2.TestAllTypes()

    with self.assertRaises(ValueError) as _:
      m.optional_nested_enum = 1234567
    self.assertRaises(ValueError, m.repeated_nested_enum.append, 1234567)

  def testGoldenExtensions(self):
    golden_data = test_util.GoldenFileData('golden_message')
    golden_message = unittest_pb2.TestAllExtensions()
    golden_message.ParseFromString(golden_data)
    all_set = unittest_pb2.TestAllExtensions()
    test_util.SetAllExtensions(all_set)
    self.assertEqual(all_set, golden_message)
    self.assertEqual(golden_data, golden_message.SerializeToString())
    golden_copy = copy.deepcopy(golden_message)
    self.assertEqual(golden_data, golden_copy.SerializeToString())

  def testGoldenPackedExtensions(self):
    golden_data = test_util.GoldenFileData('golden_packed_fields_message')
    golden_message = unittest_pb2.TestPackedExtensions()
    golden_message.ParseFromString(golden_data)
    all_set = unittest_pb2.TestPackedExtensions()
    test_util.SetAllPackedExtensions(all_set)
    self.assertEqual(all_set, golden_message)
    self.assertEqual(golden_data, all_set.SerializeToString())
    golden_copy = copy.deepcopy(golden_message)
    self.assertEqual(golden_data, golden_copy.SerializeToString())

  def testPickleIncompleteProto(self):
    golden_message = unittest_pb2.TestRequired(a=1)
    pickled_message = pickle.dumps(golden_message)

    unpickled_message = pickle.loads(pickled_message)
    self.assertEqual(unpickled_message, golden_message)
    self.assertEqual(unpickled_message.a, 1)
    # This is still an incomplete proto - so serializing should fail
    self.assertRaises(message.EncodeError, unpickled_message.SerializeToString)


  # TODO(haberman): this isn't really a proto2-specific test except that this
  # message has a required field in it.  Should probably be factored out so
  # that we can test the other parts with proto3.
  def testParsingMerge(self):
    """Check the merge behavior when a required or optional field appears
    multiple times in the input."""
    messages = [
        unittest_pb2.TestAllTypes(),
        unittest_pb2.TestAllTypes(),
        unittest_pb2.TestAllTypes() ]
    messages[0].optional_int32 = 1
    messages[1].optional_int64 = 2
    messages[2].optional_int32 = 3
    messages[2].optional_string = 'hello'

    merged_message = unittest_pb2.TestAllTypes()
    merged_message.optional_int32 = 3
    merged_message.optional_int64 = 2
    merged_message.optional_string = 'hello'

    generator = unittest_pb2.TestParsingMerge.RepeatedFieldsGenerator()
    generator.field1.extend(messages)
    generator.field2.extend(messages)
    generator.field3.extend(messages)
    generator.ext1.extend(messages)
    generator.ext2.extend(messages)
    generator.group1.add().field1.MergeFrom(messages[0])
    generator.group1.add().field1.MergeFrom(messages[1])
    generator.group1.add().field1.MergeFrom(messages[2])
    generator.group2.add().field1.MergeFrom(messages[0])
    generator.group2.add().field1.MergeFrom(messages[1])
    generator.group2.add().field1.MergeFrom(messages[2])

    data = generator.SerializeToString()
    parsing_merge = unittest_pb2.TestParsingMerge()
    parsing_merge.ParseFromString(data)

    # Required and optional fields should be merged.
    self.assertEqual(parsing_merge.required_all_types, merged_message)
    self.assertEqual(parsing_merge.optional_all_types, merged_message)
    self.assertEqual(parsing_merge.optionalgroup.optional_group_all_types,
                     merged_message)
    self.assertEqual(parsing_merge.Extensions[
                     unittest_pb2.TestParsingMerge.optional_ext],
                     merged_message)

    # Repeated fields should not be merged.
    self.assertEqual(len(parsing_merge.repeated_all_types), 3)
    self.assertEqual(len(parsing_merge.repeatedgroup), 3)
    self.assertEqual(len(parsing_merge.Extensions[
        unittest_pb2.TestParsingMerge.repeated_ext]), 3)


# Class to test proto3-only features/behavior (updated field presence & enums)
class Proto3Test(basetest.TestCase):

  def testFieldPresence(self):
    message = unittest_proto3_arena_pb2.TestAllTypes()

    # We can't test presence of non-repeated, non-submessage fields.
    with self.assertRaises(ValueError):
      message.HasField("optional_int32")
    with self.assertRaises(ValueError):
      message.HasField("optional_float")
    with self.assertRaises(ValueError):
      message.HasField("optional_string")
    with self.assertRaises(ValueError):
      message.HasField("optional_bool")

    # But we can still test presence of submessage fields.
    self.assertFalse(message.HasField("optional_nested_message"))

    # As with proto2, we can't test presence of fields that don't exist, or
    # repeated fields.
    with self.assertRaises(ValueError):
      message.HasField("field_doesnt_exist")

    with self.assertRaises(ValueError):
      message.HasField("repeated_int32")
    with self.assertRaises(ValueError):
      message.HasField("repeated_nested_message")

    # Fields should default to their type-specific default.
    self.assertEqual(0, message.optional_int32)
    self.assertEqual(0, message.optional_float)
    self.assertEqual("", message.optional_string)
    self.assertEqual(False, message.optional_bool)
    self.assertEqual(0, message.optional_nested_message.bb)

    # Setting a submessage should still return proper presence information.
    message.optional_nested_message.bb = 0
    self.assertTrue(message.HasField("optional_nested_message"))

    # Set the fields to non-default values.
    message.optional_int32 = 5
    message.optional_float = 1.1
    message.optional_string = "abc"
    message.optional_bool = True
    message.optional_nested_message.bb = 15

    # Clearing the fields unsets them and resets their value to default.
    message.ClearField("optional_int32")
    message.ClearField("optional_float")
    message.ClearField("optional_string")
    message.ClearField("optional_bool")
    message.ClearField("optional_nested_message")

    self.assertEqual(0, message.optional_int32)
    self.assertEqual(0, message.optional_float)
    self.assertEqual("", message.optional_string)
    self.assertEqual(False, message.optional_bool)
    self.assertEqual(0, message.optional_nested_message.bb)

  def testAssignUnknownEnum(self):
    """Assigning an unknown enum value is allowed and preserves the value."""
    m = unittest_proto3_arena_pb2.TestAllTypes()

    m.optional_nested_enum = 1234567
    self.assertEqual(1234567, m.optional_nested_enum)
    m.repeated_nested_enum.append(22334455)
    self.assertEqual(22334455, m.repeated_nested_enum[0])
    # Assignment is a different code path than append for the C++ impl.
    m.repeated_nested_enum[0] = 7654321
    self.assertEqual(7654321, m.repeated_nested_enum[0])
    serialized = m.SerializeToString()

    m2 = unittest_proto3_arena_pb2.TestAllTypes()
    m2.ParseFromString(serialized)
    self.assertEqual(1234567, m2.optional_nested_enum)
    self.assertEqual(7654321, m2.repeated_nested_enum[0])


class ValidTypeNamesTest(basetest.TestCase):

  def assertImportFromName(self, msg, base_name):
    # Parse <type 'module.class_name'> to extra 'some.name' as a string.
    tp_name = str(type(msg)).split("'")[1]
    valid_names = ('Repeated%sContainer' % base_name,
                   'Repeated%sFieldContainer' % base_name)
    self.assertTrue(any(tp_name.endswith(v) for v in valid_names),
                    '%r does end with any of %r' % (tp_name, valid_names))

    parts = tp_name.split('.')
    class_name = parts[-1]
    module_name = '.'.join(parts[:-1])
    __import__(module_name, fromlist=[class_name])

  def testTypeNamesCanBeImported(self):
    # If import doesn't work, pickling won't work either.
    pb = unittest_pb2.TestAllTypes()
    self.assertImportFromName(pb.repeated_int32, 'Scalar')
    self.assertImportFromName(pb.repeated_nested_message, 'Composite')


if __name__ == '__main__':
  basetest.main()