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diff --git a/sources/shiboken2/tests/samplebinding/privatedtor_test.py b/sources/shiboken2/tests/samplebinding/privatedtor_test.py
new file mode 100644
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+++ b/sources/shiboken2/tests/samplebinding/privatedtor_test.py
@@ -0,0 +1,99 @@
+#!/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 cases for a class with a private destructor.'''
+
+import gc
+import sys
+import unittest
+
+import shiboken2 as shiboken
+from sample import PrivateDtor
+
+
+class PrivateDtorTest(unittest.TestCase):
+    '''Test case for PrivateDtor class'''
+
+    def testPrivateDtorInstanciation(self):
+        '''Test if instanciation of class with a private destructor raises an exception.'''
+        self.assertRaises(TypeError, PrivateDtor)
+
+    def testPrivateDtorInheritance(self):
+        '''Test if inheriting from PrivateDtor raises an exception.'''
+        def inherit():
+            class Foo(PrivateDtor):
+                pass
+        self.assertRaises(TypeError, inherit)
+
+    def testPrivateDtorInstanceMethod(self):
+        '''Test if PrivateDtor.instance() method return the proper singleton.'''
+        pd1 = PrivateDtor.instance()
+        calls = pd1.instanceCalls()
+        self.assertEqual(type(pd1), PrivateDtor)
+        pd2 = PrivateDtor.instance()
+        self.assertEqual(pd2, pd1)
+        self.assertEqual(pd2.instanceCalls(), calls + 1)
+
+    def testPrivateDtorRefCounting(self):
+        '''Test refcounting of the singleton returned by PrivateDtor.instance().'''
+        pd1 = PrivateDtor.instance()
+        calls = pd1.instanceCalls()
+        refcnt = sys.getrefcount(pd1)
+        pd2 = PrivateDtor.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 = PrivateDtor.instance()
+        self.assertEqual(type(pd3), PrivateDtor)
+        self.assertEqual(pd3.instanceCalls(), calls + 2)
+        self.assertEqual(sys.getrefcount(pd3), refcnt)
+
+    def testClassDecref(self):
+        # Bug was that class PyTypeObject wasn't decrefed when instance
+        # was invalidated
+
+        before = sys.getrefcount(PrivateDtor)
+
+        for i in range(1000):
+            obj = PrivateDtor.instance()
+            shiboken.invalidate(obj)
+
+        after = sys.getrefcount(PrivateDtor)
+
+        self.assertLess(abs(before - after), 5)
+
+if __name__ == '__main__':
+    unittest.main()
+