1 files changed, 89 insertions, 0 deletions
diff --git a/sources/shiboken6/tests/samplebinding/cyclic_test.py b/sources/shiboken6/tests/samplebinding/cyclic_test.py
new file mode 100644
index 000000000..4e4ae2603
--- /dev/null
+++ b/sources/shiboken6/tests/samplebinding/cyclic_test.py
@@ -0,0 +1,89 @@
+#!/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
+
+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
+from sample import ObjectView
+from sample import ObjectModel
+
+
+class ObjTest(unittest.TestCase):
+
+    def test_cyclic_dependency_withParent(self):
+        """Create 2 objects with a cyclic dependency, so that they can
+        only be removed by the garbage collector, and then invoke the
+        garbage collector in a different thread.
+        """
+        class CyclicChildObject(ObjectType):
+            def __init__(self, parent):
+                super(CyclicChildObject, self).__init__(parent)
+                self._parent = parent
+
+        class CyclicObject(ObjectType):
+            def __init__(self):
+                super(CyclicObject, self).__init__()
+                CyclicChildObject(self)
+
+        # turn off automatic garbage collection, to be able to trigger it
+        # at the 'right' time
+        gc.disable()
+        alive = lambda: sum(isinstance(o, CyclicObject) for o in gc.get_objects())  # noqa: E731
+
+        #
+        # first proof that the wizard is only destructed by the garbage
+        # collector
+        #
+        cycle = CyclicObject()
+        self.assertTrue(alive())
+        del cycle
+        if not hasattr(sys, "pypy_version_info"):
+            # PYSIDE-535: the semantics of gc.enable/gc.disable is different for PyPy
+            self.assertTrue(alive())
+        gc.collect()
+        self.assertFalse(alive())
+
+    def test_cyclic_dependency_withKeepRef(self):
+        """Create 2 objects with a cyclic dependency, so that they can
+        only be removed by the garbage collector, and then invoke the
+        garbage collector in a different thread.
+        """
+        class CyclicChildObject(ObjectView):
+            def __init__(self, model):
+                super(CyclicChildObject, self).__init__(None)
+                self.setModel(model)
+
+        class CyclicObject(ObjectModel):
+            def __init__(self):
+                super(CyclicObject, self).__init__()
+                self._view = CyclicChildObject(self)
+
+        # turn off automatic garbage collection, to be able to trigger it
+        # at the 'right' time
+        gc.disable()
+        alive = lambda: sum(isinstance(o, CyclicObject) for o in gc.get_objects())  # noqa: E731
+
+        #
+        # first proof that the wizard is only destructed by the garbage
+        # collector
+        #
+        cycle = CyclicObject()
+        self.assertTrue(alive())
+        del cycle
+        if not hasattr(sys, "pypy_version_info"):
+            # PYSIDE-535: the semantics of gc.enable/gc.disable is different for PyPy
+            self.assertTrue(alive())
+        gc.collect()
+        self.assertFalse(alive())
+
+
+if __name__ == '__main__':
+    unittest.main()