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#!/usr/bin/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 case for duck punching new implementations of C++ virtual methods into object instances.'''
import gc
import os
import sys
import types
import unittest
from pathlib import Path
sys.path.append(os.fspath(Path(__file__).resolve().parents[1]))
from init_paths import init_test_paths
init_test_paths(False)
from PySide6.QtCore import QObject
from helper.usesqapplication import UsesQApplication
def MethodType(func, instance, instanceType):
return types.MethodType(func, instance)
class Duck(QObject):
def __init__(self):
super().__init__()
def childEvent(self, event):
QObject.childEvent(self, event)
class TestDuckPunchingOnQObjectInstance(UsesQApplication):
'''Test case for duck punching new implementations of C++ virtual methods into object instances.'''
def setUp(self):
# Acquire resources
self.duck_childEvent_called = False
UsesQApplication.setUp(self)
def tearDown(self):
# Release resources
del self.duck_childEvent_called
# PYSIDE-535: Need to collect garbage in PyPy to trigger deletion
gc.collect()
UsesQApplication.tearDown(self)
def testChildEventMonkeyPatch(self):
# Test if the new childEvent injected on QObject instance is called from C++
parent = QObject()
def childEvent(obj, event):
self.duck_childEvent_called = True
parent.childEvent = MethodType(childEvent, parent, QObject)
child = QObject()
child.setParent(parent)
self.assertTrue(self.duck_childEvent_called)
# This is done to decrease the refcount of the vm object
# allowing the object wrapper to be deleted before the
# BindingManager. This is useful when compiling Shiboken
# for debug, since the BindingManager destructor has an
# assert that checks if the wrapper mapper is empty.
parent.childEvent = None
def testChildEventMonkeyPatchWithInheritance(self):
# Test if the new childEvent injected on a QObject's extension class instance is called from C++
parent = Duck()
def childEvent(obj, event):
QObject.childEvent(obj, event)
self.duck_childEvent_called = True
child = QObject()
child.setParent(parent)
parent.childEvent = MethodType(childEvent, parent, QObject)
child = QObject()
child.setParent(parent)
self.assertTrue(self.duck_childEvent_called)
# This is done to decrease the refcount of the vm object
# allowing the object wrapper to be deleted before the
# BindingManager. This is useful when compiling Shiboken
# for debug, since the BindingManager destructor has an
# assert that checks if the wrapper mapper is empty.
parent.childEvent = None
if __name__ == '__main__':
unittest.main()
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