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Diffstat (limited to 'sources/shiboken2/tests/samplebinding/cyclic_test.py')
-rw-r--r-- | sources/shiboken2/tests/samplebinding/cyclic_test.py | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/sources/shiboken2/tests/samplebinding/cyclic_test.py b/sources/shiboken2/tests/samplebinding/cyclic_test.py new file mode 100644 index 000000000..e92b3605f --- /dev/null +++ b/sources/shiboken2/tests/samplebinding/cyclic_test.py @@ -0,0 +1,109 @@ +#!/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 PySide2. +## +## $QT_BEGIN_LICENSE:GPL-EXCEPT$ +## 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() + |