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diff --git a/sources/pyside6/tests/QtCore/mockclass_test.py b/sources/pyside6/tests/QtCore/mockclass_test.py
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+#############################################################################
+##
+## Copyright (C) 2016 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the test suite of Qt for Python.
+##
+## $QT_BEGIN_LICENSE:GPL-EXCEPT$
+## 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 PySide bug 634
+# http://bugs.pyside.org/show_bug.cgi?id=634
+# Marcus Lindblom <macke@yar.nu>; 2011-02-16
+
+import os
+import sys
+import unittest
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+from init_paths import init_test_paths
+init_test_paths(False)
+
+from PySide6.QtCore import QCoreApplication
+
+class Mock(object):
+    def __init__(self):
+        self.called = False
+        self.return_value = None
+
+    def __call__(self, *args, **kwargs):
+        self.called = True
+        return self.return_value
+
+
+class MockClassTest(unittest.TestCase):
+    def testMockQCoreApplication(self):
+        mock = Mock()
+        setattr(QCoreApplication, 'instance', mock)
+        QCoreApplication.instance()
+        self.assertTrue(mock.called)
+
+if __name__ == '__main__':
+    unittest.main()
+