1 files changed, 223 insertions, 0 deletions
diff --git a/sources/shiboken6/tests/samplebinding/multiple_derived_test.py b/sources/shiboken6/tests/samplebinding/multiple_derived_test.py
new file mode 100644
index 000000000..7497714a8
--- /dev/null
+++ b/sources/shiboken6/tests/samplebinding/multiple_derived_test.py
@@ -0,0 +1,223 @@
+#!/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 multiple inheritance'''
+
+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 Base1, Base2
+from sample import MDerived1, MDerived2, MDerived3, MDerived4, MDerived5, SonOfMDerived1
+
+
+class ExtMDerived1(MDerived1):
+    def __init__(self):
+        MDerived1.__init__(self)
+        self.multiplier = 20
+        self.base2Method_called = False
+
+    def base2Method(self):
+        return Base2.base2Method(self) * self.multiplier
+
+
+class MultipleDerivedTest(unittest.TestCase):
+    '''Test cases for multiple inheritance'''
+
+    def testIsInstance(self):
+        '''MDerived1 is instance of its parents Base1 and Base2.'''
+        a = MDerived1()
+        self.assertTrue(isinstance(a, MDerived1))
+        self.assertTrue(isinstance(a, Base1))
+        self.assertTrue(isinstance(a, Base2))
+
+    def testIsSubclass(self):
+        '''MDerived1 is subclass of its parents Base1 and Base2.'''
+        self.assertTrue(issubclass(MDerived1, Base1))
+        self.assertTrue(issubclass(MDerived1, Base2))
+
+    def testCallToFunctionWithBase1ArgumentThatCastsBackToMDerived1(self):
+        '''MDerived1 is passed as an Base1 argument to a method that returns
+           it casted back to MDerived1.'''
+        a = MDerived1()
+        b = MDerived1.transformFromBase1(a)
+        self.assertEqual(a, b)
+
+    def testCallToFunctionWithBase2ArgumentThatCastsBackToMDerived1(self):
+        '''MDerived1 is passed as an Base2 argument to a method that returns
+           it casted back to MDerived1.'''
+        a = MDerived1()
+        b = MDerived1.transformFromBase2(a)
+        self.assertEqual(a, b)
+
+    def testPythonClassIsInstance(self):
+        '''Python defined class ExtMDerived1 is instance of its parents
+           MDerived1, Base1 and Base2.'''
+        a = ExtMDerived1()
+        self.assertTrue(isinstance(a, ExtMDerived1))
+        self.assertTrue(isinstance(a, MDerived1))
+        self.assertTrue(isinstance(a, Base1))
+        self.assertTrue(isinstance(a, Base2))
+
+    def testPythonClassIsSubclass(self):
+        '''Python defined class ExtMDerived1 is subclass of its parents
+           MDerived1, Base1 and Base2.'''
+        self.assertTrue(issubclass(ExtMDerived1, MDerived1))
+        self.assertTrue(issubclass(ExtMDerived1, Base1))
+        self.assertTrue(issubclass(ExtMDerived1, Base2))
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testCastFromMDerived1ToBases(self):
+        '''MDerived1 is casted by C++ to its parents and the binding must return the
+           MDerived1 wrapper.'''
+        a = MDerived1()
+        refcnt = sys.getrefcount(a)
+        b1 = a.castToBase1()
+        b2 = a.castToBase2()
+        self.assertTrue(isinstance(b1, MDerived1))
+        self.assertTrue(isinstance(b2, MDerived1))
+        self.assertEqual(a, b1)
+        self.assertEqual(a, b2)
+        self.assertEqual(sys.getrefcount(a), refcnt + 2)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testCastFromExtMDerived1ToMDerived1Bases(self):
+        '''Python defined class ExtMDerived1 is casted by C++ to MDerived1 parents
+           and the binding must return the correct ExtMDerived1 instance.'''
+        a = ExtMDerived1()
+        refcnt = sys.getrefcount(a)
+        b1 = a.castToBase1()
+        self.assertTrue(isinstance(b1, MDerived1))
+        self.assertTrue(isinstance(b1, ExtMDerived1))
+        b2 = a.castToBase2()
+        self.assertTrue(isinstance(b2, MDerived1))
+        self.assertTrue(isinstance(b2, ExtMDerived1))
+        self.assertEqual(a, b1)
+        self.assertEqual(a, b2)
+        self.assertEqual(sys.getrefcount(a), refcnt + 2)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testCastFromSonOfMDerived1ToBases(self):
+        '''SonOfMDerived1 is casted by C++ to its parents and the binding must return
+           the SonOfMDerived1 wrapper.'''
+        a = SonOfMDerived1()
+        refcnt = sys.getrefcount(a)
+        md1 = a.castToMDerived1()
+        b1 = a.castToBase1()
+        b2 = a.castToBase2()
+        self.assertTrue(isinstance(md1, SonOfMDerived1))
+        self.assertTrue(isinstance(b2, SonOfMDerived1))
+        self.assertTrue(isinstance(b2, SonOfMDerived1))
+        self.assertEqual(a, md1)
+        self.assertEqual(a, b1)
+        self.assertEqual(a, b2)
+        self.assertEqual(sys.getrefcount(a), refcnt + 3)
+
+    def testReimplementedBase2VirtualMethodOnClassInheritingFromMDerived1(self):
+        a = ExtMDerived1()
+        value = a.base2Method()
+        self.assertTrue(value, Base2.base2Method(a) * a.multiplier)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testCastFromMDerived2ToBases(self):
+        '''MDerived2 is casted by C++ to its parents and the binding must
+           return the MDerived2 wrapper.'''
+        a = MDerived2()
+        refcnt = sys.getrefcount(a)
+        b3 = a.castToBase3()
+        b4 = a.castToBase4()
+        b5 = a.castToBase5()
+        b6 = a.castToBase6()
+        self.assertTrue(isinstance(b3, MDerived2))
+        self.assertTrue(isinstance(b4, MDerived2))
+        self.assertTrue(isinstance(b5, MDerived2))
+        self.assertTrue(isinstance(b6, MDerived2))
+        self.assertEqual(a, b3)
+        self.assertEqual(a, b4)
+        self.assertEqual(a, b5)
+        self.assertEqual(a, b6)
+        self.assertEqual(sys.getrefcount(a), refcnt + 4)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testCastFromMDerived3ToBases(self):
+        '''MDerived3 is casted by C++ to its parents and the binding must
+           return the MDerived3 wrapper.'''
+        a = MDerived3()
+        refcnt = sys.getrefcount(a)
+        md1 = a.castToMDerived1()
+        md2 = a.castToMDerived2()
+        b1 = a.castToBase1()
+        b2 = a.castToBase2()
+        b3 = a.castToBase3()
+        b4 = a.castToBase4()
+        b5 = a.castToBase5()
+        b6 = a.castToBase6()
+        self.assertTrue(isinstance(md1, MDerived3))
+        self.assertTrue(isinstance(md2, MDerived3))
+        self.assertTrue(isinstance(b1, MDerived3))
+        self.assertTrue(isinstance(b2, MDerived3))
+        self.assertTrue(isinstance(b3, MDerived3))
+        self.assertTrue(isinstance(b4, MDerived3))
+        self.assertTrue(isinstance(b5, MDerived3))
+        self.assertTrue(isinstance(b6, MDerived3))
+        self.assertEqual(a, md1)
+        self.assertEqual(a, md2)
+        self.assertEqual(a, b1)
+        self.assertEqual(a, b2)
+        self.assertEqual(a, b3)
+        self.assertEqual(a, b4)
+        self.assertEqual(a, b5)
+        self.assertEqual(a, b6)
+        self.assertEqual(sys.getrefcount(a), refcnt + 8)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testCastFromMDerived4ToBases(self):
+        '''MDerived4 is casted by C++ to its parents and the binding must
+           return the MDerived4 wrapper.'''
+        a = MDerived4()
+        refcnt = sys.getrefcount(a)
+        b3 = a.castToBase3()
+        b4 = a.castToBase4()
+        self.assertTrue(isinstance(b3, MDerived4))
+        self.assertTrue(isinstance(b4, MDerived4))
+        self.assertEqual(a, b3)
+        self.assertEqual(a, b4)
+        self.assertEqual(sys.getrefcount(a), refcnt + 2)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testCastFromMDerived5ToBases(self):
+        '''MDerived5 is casted by C++ to its parents and the binding must
+           return the MDerived5 wrapper.'''
+        a = MDerived5()
+        refcnt = sys.getrefcount(a)
+        b3 = a.castToBase3()
+        b4 = a.castToBase4()
+        self.assertTrue(isinstance(b3, MDerived5))
+        self.assertTrue(isinstance(b4, MDerived5))
+        self.assertEqual(a, b3)
+        self.assertEqual(a, b4)
+        self.assertEqual(sys.getrefcount(a), refcnt + 2)
+
+    @unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
+    def testCastFromMDerived3ToBase3(self):
+        '''MDerived3 is casted by C++ to Base3 grandparent using both the inherited
+           and reimplement castToBase3 methods.'''
+        a = MDerived3()
+        refcnt = sys.getrefcount(a)
+        b3_reimplemented = a.castToBase3()
+        b3_inherited = MDerived2.castToBase3(a)
+        self.assertTrue(isinstance(b3_reimplemented, MDerived3))
+        self.assertTrue(isinstance(b3_inherited, MDerived3))
+        self.assertEqual(a, b3_reimplemented)
+        self.assertEqual(a, b3_inherited)
+        self.assertEqual(sys.getrefcount(a), refcnt + 2)
+
+
+if __name__ == '__main__':
+    unittest.main()