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#!/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 a class with a private destructor.'''
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 shiboken6 import Shiboken
from sample import PrivateDtor
class PrivateDtorTest(unittest.TestCase):
'''Test case for PrivateDtor class'''
def assertRaises(self, *args, **kwds):
if not hasattr(sys, "pypy_version_info"):
# PYSIDE-535: PyPy complains "Fatal RPython error: NotImplementedError"
return super().assertRaises(*args, **kwds)
def testPrivateDtorInstanciation(self):
'''Test if instanciation of class with a private destructor raises an exception.'''
self.assertRaises(TypeError, PrivateDtor)
def testPrivateDtorInheritance(self):
'''Test if inheriting from PrivateDtor raises an exception.'''
def inherit():
class Foo(PrivateDtor):
pass
self.assertRaises(TypeError, inherit)
def testPrivateDtorInstanceMethod(self):
'''Test if PrivateDtor.instance() method return the proper singleton.'''
pd1 = PrivateDtor.instance()
calls = pd1.instanceCalls()
self.assertEqual(type(pd1), PrivateDtor)
pd2 = PrivateDtor.instance()
self.assertEqual(pd2, pd1)
self.assertEqual(pd2.instanceCalls(), calls + 1)
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testPrivateDtorRefCounting(self):
'''Test refcounting of the singleton returned by PrivateDtor.instance().'''
pd1 = PrivateDtor.instance()
calls = pd1.instanceCalls()
refcnt = sys.getrefcount(pd1)
pd2 = PrivateDtor.instance()
self.assertEqual(pd2.instanceCalls(), calls + 1)
self.assertEqual(sys.getrefcount(pd2), sys.getrefcount(pd1))
self.assertEqual(sys.getrefcount(pd2), refcnt + 1)
del pd1
self.assertEqual(sys.getrefcount(pd2), refcnt)
del pd2
gc.collect()
pd3 = PrivateDtor.instance()
self.assertEqual(type(pd3), PrivateDtor)
self.assertEqual(pd3.instanceCalls(), calls + 2)
self.assertEqual(sys.getrefcount(pd3), refcnt)
@unittest.skipUnless(hasattr(sys, "getrefcount"), f"{sys.implementation.name} has no refcount")
def testClassDecref(self):
# Bug was that class PyTypeObject wasn't decrefed when instance
# was invalidated
before = sys.getrefcount(PrivateDtor)
for i in range(1000):
obj = PrivateDtor.instance()
Shiboken.invalidate(obj)
after = sys.getrefcount(PrivateDtor)
self.assertLess(abs(before - after), 5)
if __name__ == '__main__':
unittest.main()
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