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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#############################################################################
##
## Copyright (C) 2016 The Qt Company Ltd.
## Contact: https://www.qt.io/licensing/
##
## This file is part of the test suite of the Qt for Python project.
##
## $QT_BEGIN_LICENSE:GPL-EXCEPT$
## Commercial License Usage
## Licensees holding valid commercial Qt licenses may use this file in
## accordance with the commercial license agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and The Qt Company. For licensing terms
## and conditions see https://www.qt.io/terms-conditions. For further
## information use the contact form at https://www.qt.io/contact-us.
##
## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU
## General Public License version 3 as published by the Free Software
## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
## included in the packaging of this file. Please review the following
## information to ensure the GNU General Public License requirements will
## be met: https://www.gnu.org/licenses/gpl-3.0.html.
##
## $QT_END_LICENSE$
##
#############################################################################
'''Test cases for a class with only a private constructor.'''
import gc
import sys
import unittest
from sample import PrivateCtor
class PrivateCtorTest(unittest.TestCase):
'''Test case for PrivateCtor class'''
def testPrivateCtorInstanciation(self):
'''Test if instanciation of class with a private constructor raises an exception.'''
self.assertRaises(TypeError, PrivateCtor)
def testPrivateCtorInheritance(self):
'''Test if inheriting from PrivateCtor raises an exception.'''
def inherit():
class Foo(PrivateCtor):
pass
self.assertRaises(TypeError, inherit)
def testPrivateCtorInstanceMethod(self):
'''Test if PrivateCtor.instance() method return the proper singleton.'''
pd1 = PrivateCtor.instance()
calls = pd1.instanceCalls()
self.assertEqual(type(pd1), PrivateCtor)
pd2 = PrivateCtor.instance()
self.assertEqual(pd2, pd1)
self.assertEqual(pd2.instanceCalls(), calls + 1)
def testPrivateCtorRefCounting(self):
'''Test refcounting of the singleton returned by PrivateCtor.instance().'''
pd1 = PrivateCtor.instance()
calls = pd1.instanceCalls()
refcnt = sys.getrefcount(pd1)
pd2 = PrivateCtor.instance()
self.assertEqual(pd2.instanceCalls(), calls + 1)
self.assertEqual(sys.getrefcount(pd2), sys.getrefcount(pd1))
self.assertEqual(sys.getrefcount(pd2), refcnt + 1)
del pd1
self.assertEqual(sys.getrefcount(pd2), refcnt)
del pd2
gc.collect()
pd3 = PrivateCtor.instance()
self.assertEqual(type(pd3), PrivateCtor)
self.assertEqual(pd3.instanceCalls(), calls + 2)
self.assertEqual(sys.getrefcount(pd3), refcnt)
if __name__ == '__main__':
unittest.main()
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