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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 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.
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+'''Test case for objects that keep references to other object without owning them (e.g. model/view relationships).'''
+
+import unittest
+from sys import getrefcount
+
+from sample import ObjectModel, ObjectView
+
+class TestKeepReference(unittest.TestCase):
+ '''Test case for objects that keep references to other object without owning them (e.g. model/view relationships).'''
+
+ def testReferenceCounting(self):
+ '''Tests reference count of model-like object referred by view-like objects.'''
+ model1 = ObjectModel()
+ refcount1 = getrefcount(model1)
+ view1 = ObjectView()
+ view1.setModel(model1)
+ self.assertEqual(getrefcount(view1.model()), refcount1 + 1)
+
+ view2 = ObjectView()
+ view2.setModel(model1)
+ self.assertEqual(getrefcount(view2.model()), refcount1 + 2)
+
+ model2 = ObjectModel()
+ view2.setModel(model2)
+ self.assertEqual(getrefcount(view1.model()), refcount1 + 1)
+
+ def testReferenceCountingWhenDeletingReferrer(self):
+ '''Tests reference count of model-like object referred by deceased view-like object.'''
+ model = ObjectModel()
+ refcount1 = getrefcount(model)
+ view = ObjectView()
+ view.setModel(model)
+ self.assertEqual(getrefcount(view.model()), refcount1 + 1)
+
+ del view
+ self.assertEqual(getrefcount(model), refcount1)
+
+ def testReferreedObjectSurvivalAfterContextEnd(self):
+ '''Model-like object assigned to a view-like object must survive after get out of context.'''
+ def createModelAndSetToView(view):
+ model = ObjectModel()
+ model.setObjectName('created model')
+ view.setModel(model)
+ view = ObjectView()
+ createModelAndSetToView(view)
+ model = view.model()
+
+if __name__ == '__main__':
+ unittest.main()
+