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# Copyright 2017 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import unittest
import six
from py_utils import slots_metaclass
class SlotsMetaclassUnittest(unittest.TestCase):
def testSlotsMetaclass(self):
class NiceClass(six.with_metaclass(slots_metaclass.SlotsMetaclass, object)):
__slots__ = '_nice',
def __init__(self, nice):
self._nice = nice
NiceClass(42)
with self.assertRaises(AssertionError):
class NaughtyClass(NiceClass):
def __init__(self, naughty):
super(NaughtyClass, self).__init__(42)
self._naughty = naughty
# Metaclasses are called when the class is defined, so no need to
# instantiate it.
with self.assertRaises(AttributeError):
class NaughtyClass2(NiceClass):
__slots__ = ()
def __init__(self, naughty):
super(NaughtyClass2, self).__init__(42)
self._naughty = naughty # pylint: disable=assigning-non-slot
# SlotsMetaclass is happy that __slots__ is defined, but python won't be
# happy about assigning _naughty when the class is instantiated because it
# isn't listed in __slots__, even if you disable the pylint error.
NaughtyClass2(666)
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