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diff --git a/sources/pyside6/tests/QtCore/qobject_inherits_test.py b/sources/pyside6/tests/QtCore/qobject_inherits_test.py
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+++ b/sources/pyside6/tests/QtCore/qobject_inherits_test.py
@@ -0,0 +1,131 @@
+#############################################################################
+##
+## 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 cases for QObject methods'''
+
+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 QObject, QTimer
+from PySide6.QtWidgets import QApplication, QLabel, QVBoxLayout
+
+is_alive = None
+
+class InheritsCase(unittest.TestCase):
+    '''Test case for QObject.inherits'''
+
+    def testCppInheritance(self):
+        #QObject.inherits() for c++ classes
+        #An class inherits itself
+        self.assertTrue(QObject().inherits('QObject'))
+
+    def testPythonInheritance(self):
+        #QObject.inherits() for python classes
+
+        class Dummy(QObject):
+            #Dummy class
+            pass
+
+        self.assertTrue(Dummy().inherits('QObject'))
+        self.assertTrue(Dummy().inherits('Dummy'))
+        self.assertTrue(not Dummy().inherits('FooBar'))
+
+    def testPythonMultiInheritance(self):
+        #QObject.inherits() for multiple inheritance
+        # QObject.inherits(classname) should fail if classname isn't a
+        # QObject subclass
+
+        class Parent(object):
+            #Dummy parent
+            pass
+        class Dummy(QObject, Parent):
+            #Dummy class
+            pass
+
+        self.assertTrue(Dummy().inherits('QObject'))
+        self.assertTrue(not Dummy().inherits('Parent'))
+
+    def testSetAttributeBeforeCallingInitOnQObjectDerived(self):
+        '''Test for bug #428.'''
+        class DerivedObject(QObject):
+            def __init__(self):
+                self.member = 'member'
+                QObject.__init__(self)
+        obj0 = DerivedObject()
+        # The second instantiation of DerivedObject will generate an exception
+        # that will not come to surface immediately.
+        obj1 = DerivedObject()
+        # The mere calling of the object method causes
+        # the exception to "reach the surface".
+        obj1.objectName()
+
+    def testMultipleInheritance(self):
+        def declareClass():
+            class Foo(object, QObject):
+                pass
+
+        self.assertRaises(TypeError, declareClass)
+
+    # PYSIDE-11:
+    #   The takeOwnership() method was relying that the SbkObject
+    #   had a converter, which it's not the case when multiple
+    #   inheritance is used.
+    #   The deleteLater() method uses the takeOwnership() to give
+    #   control of the object to C++, so it can be remove once
+    #   the destructor is called.
+    #   The solution was to add a default case when the object
+    #   is null under the pythonTypeIsValueType() method in shiboken.
+    def testDeleteMultipleInheritance(self):
+        app = QApplication(sys.argv)
+        class DerivedLabel(QLabel, QObject):
+            def __del__(self):
+                global is_alive
+                is_alive = False
+
+        global is_alive
+        child = DerivedLabel('Hello')
+        is_alive = True
+        parent = QVBoxLayout()
+        parent.addWidget(child)
+        parent.removeWidget(child)
+        child.deleteLater()
+        self.assertTrue(is_alive)
+        del child
+        self.assertTrue(is_alive)
+        QTimer.singleShot(100, app.quit)
+        app.exec_()
+        self.assertFalse(is_alive)
+
+
+if __name__ == '__main__':
+    unittest.main()