1 files changed, 85 insertions, 0 deletions
diff --git a/sources/shiboken6/tests/samplebinding/privatedtor_test.py b/sources/shiboken6/tests/samplebinding/privatedtor_test.py
new file mode 100644
index 000000000..651f63b15
--- /dev/null
+++ b/sources/shiboken6/tests/samplebinding/privatedtor_test.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+'''Test cases for a class with a private destructor.'''
+
+import gc
+import os
+import sys
+import unittest
+
+from pathlib import Path
+sys.path.append(os.fspath(Path(__file__).resolve().parents[1]))
+from shiboken_paths import init_paths
+init_paths()
+
+from shiboken6 import Shiboken
+from sample import PrivateDtor
+
+
+class PrivateDtorTest(unittest.TestCase):
+    '''Test case for PrivateDtor class'''
+
+    def assertRaises(self, *args, **kwds):
+        if not hasattr(sys, "pypy_version_info"):
+            # PYSIDE-535: PyPy complains "Fatal RPython error: NotImplementedError"
+            return super().assertRaises(*args, **kwds)
+
+    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)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    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)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    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()