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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.
##
## $QT_END_LICENSE$
##
#############################################################################
import unittest
from sample import ObjectType
from sample import ObjectView
from sample import ObjectModel
class ObjTest(unittest.TestCase):
def test_cyclic_dependency_withParent(self):
"""Create 2 objects with a cyclic dependency, so that they can
only be removed by the garbage collector, and then invoke the
garbage collector in a different thread.
"""
import gc
class CyclicChildObject(ObjectType):
def __init__(self, parent):
super(CyclicChildObject, self).__init__(parent)
self._parent = parent
class CyclicObject(ObjectType):
def __init__(self):
super(CyclicObject, self).__init__()
CyclicChildObject(self)
# turn off automatic garbage collection, to be able to trigger it
# at the 'right' time
gc.disable()
alive = lambda :sum(isinstance(o, CyclicObject) for o in gc.get_objects() )
#
# first proof that the wizard is only destructed by the garbage
# collector
#
cycle = CyclicObject()
self.assertTrue(alive())
del cycle
self.assertTrue(alive())
gc.collect()
self.assertFalse(alive())
def test_cyclic_dependency_withKeepRef(self):
"""Create 2 objects with a cyclic dependency, so that they can
only be removed by the garbage collector, and then invoke the
garbage collector in a different thread.
"""
import gc
class CyclicChildObject(ObjectView):
def __init__(self, model):
super(CyclicChildObject, self).__init__(None)
self.setModel(model)
class CyclicObject(ObjectModel):
def __init__(self):
super(CyclicObject, self).__init__()
self._view = CyclicChildObject(self)
# turn off automatic garbage collection, to be able to trigger it
# at the 'right' time
gc.disable()
alive = lambda :sum(isinstance(o, CyclicObject) for o in gc.get_objects() )
#
# first proof that the wizard is only destructed by the garbage
# collector
#
cycle = CyclicObject()
self.assertTrue(alive())
del cycle
self.assertTrue(alive())
gc.collect()
self.assertFalse(alive())
if __name__ == '__main__':
unittest.main()
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