blob: 79bb343d7715d2c99ef5742065bb5ce9df39809f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
# 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.
import unittest
from py_utils import slots_metaclass
class SlotsMetaclassUnittest(unittest.TestCase):
def testSlotsMetaclass(self):
class NiceClass(object):
__metaclass__ = slots_metaclass.SlotsMetaclass
__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)
|
