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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This file is part of the Shiboken Python Bindings Generator project.
#
# Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
#
# Contact: PySide team <contact@pyside.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# version 2.1 as published by the Free Software Foundation. Please
# review the following information to ensure the GNU Lesser General
# Public License version 2.1 requirements will be met:
# http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
# #
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301 USA
'''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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