1 files changed, 71 insertions, 0 deletions
diff --git a/sources/shiboken6/tests/samplebinding/ownership_transference_test.py b/sources/shiboken6/tests/samplebinding/ownership_transference_test.py
new file mode 100644
index 000000000..0e9f08b72
--- /dev/null
+++ b/sources/shiboken6/tests/samplebinding/ownership_transference_test.py
@@ -0,0 +1,71 @@
+#!/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
+
+'''The BlackBox class has cases of ownership transference between C++ and Python.'''
+
+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 sample import ObjectType, BlackBox
+
+
+class BlackBoxTest(unittest.TestCase):
+    '''The BlackBox class has cases of ownership transference between C++ and Python.'''
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testOwnershipTransference(self):
+        '''Ownership transference from Python to C++ and back again.'''
+        o1 = ObjectType()
+        o1.setObjectName('object1')
+        o1_refcnt = sys.getrefcount(o1)
+        o2 = ObjectType()
+        o2.setObjectName('object2')
+        o2_refcnt = sys.getrefcount(o2)
+        bb = BlackBox()
+        o1_ticket = bb.keepObjectType(o1)  # noqa: F841
+        o2_ticket = bb.keepObjectType(o2)
+        self.assertEqual(set(bb.objects()), set([o1, o2]))
+        self.assertEqual(str(o1.objectName()), 'object1')
+        self.assertEqual(str(o2.objectName()), 'object2')
+        # PySide give +1 ref to object with c++ ownership
+        self.assertEqual(sys.getrefcount(o1), o1_refcnt + 1)
+        self.assertEqual(sys.getrefcount(o2), o2_refcnt + 1)
+        o2 = bb.retrieveObjectType(o2_ticket)
+        self.assertEqual(sys.getrefcount(o2), o2_refcnt)
+        del bb
+        # PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
+        gc.collect()
+        self.assertRaises(RuntimeError, o1.objectName)
+        self.assertEqual(str(o2.objectName()), 'object2')
+        self.assertEqual(sys.getrefcount(o2), o2_refcnt)
+
+    def testBlackBoxReleasingUnknownObjectType(self):
+        '''Asks BlackBox to release an unknown ObjectType.'''
+        o1 = ObjectType()
+        o2 = ObjectType()  # noqa: F841
+        bb = BlackBox()
+        o1_ticket = bb.keepObjectType(o1)  # noqa: F841
+        o3 = bb.retrieveObjectType(-5)
+        self.assertEqual(o3, None)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testOwnershipTransferenceCppCreated(self):
+        '''Ownership transference using a C++ created object.'''
+        o1 = ObjectType.create()
+        o1.setObjectName('object1')
+        o1_refcnt = sys.getrefcount(o1)  # noqa: F841
+        bb = BlackBox()
+        o1_ticket = bb.keepObjectType(o1)  # noqa: F841
+        self.assertRaises(RuntimeError, o1.objectName)
+
+
+if __name__ == '__main__':
+    unittest.main()