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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 virtual methods.'''
import os
import sys
import types
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 VirtualMethods, SimpleFile, Point
def MethodTypeCompat(func, instance):
return types.MethodType(func, instance)
class Duck(VirtualMethods):
def __init__(self):
VirtualMethods.__init__(self)
class Monkey(SimpleFile):
def __init__(self, filename):
SimpleFile.__init__(self, filename)
class DuckPunchingTest(unittest.TestCase):
'''Test case for duck punching (aka "monkey patching").'''
def setUp(self):
self.multiplier = 2.0
self.duck_method_called = False
self.call_counter = 0
def testMonkeyPatchOnVirtualMethod(self):
'''Injects new 'virtualMethod0' on a VirtualMethods instance and makes C++ call it.'''
vm = VirtualMethods()
pt, val, cpx, b = Point(1.1, 2.2), 4, complex(3.3, 4.4), True
result1 = vm.virtualMethod0(pt, val, cpx, b)
result2 = vm.callVirtualMethod0(pt, val, cpx, b)
self.assertEqual(result1, result2)
self.assertEqual(result1, VirtualMethods.virtualMethod0(vm, pt, val, cpx, b))
def myVirtualMethod0(obj, pt, val, cpx, b):
self.duck_method_called = True
return VirtualMethods.virtualMethod0(obj, pt, val, cpx, b) * self.multiplier
vm.virtualMethod0 = MethodTypeCompat(myVirtualMethod0, vm)
result1 = vm.callVirtualMethod0(pt, val, cpx, b)
self.assertTrue(self.duck_method_called)
result2 = vm.virtualMethod0(pt, val, cpx, b)
self.assertEqual(result1, result2)
self.assertEqual(result1,
VirtualMethods.virtualMethod0(vm, pt, val, cpx, b) * self.multiplier)
# 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.
vm.virtualMethod0 = None
def testMonkeyPatchOnVirtualMethodWithInheritance(self):
'''Injects new 'virtualMethod0' on an object that inherits from
VirtualMethods and makes C++ call it.'''
duck = Duck()
pt, val, cpx, b = Point(1.1, 2.2), 4, complex(3.3, 4.4), True
result1 = duck.virtualMethod0(pt, val, cpx, b)
result2 = duck.callVirtualMethod0(pt, val, cpx, b)
self.assertEqual(result1, result2)
self.assertEqual(result1, VirtualMethods.virtualMethod0(duck, pt, val, cpx, b))
def myVirtualMethod0(obj, pt, val, cpx, b):
self.duck_method_called = True
return VirtualMethods.virtualMethod0(obj, pt, val, cpx, b) * self.multiplier
duck.virtualMethod0 = MethodTypeCompat(myVirtualMethod0, duck)
result1 = duck.callVirtualMethod0(pt, val, cpx, b)
self.assertTrue(self.duck_method_called)
result2 = duck.virtualMethod0(pt, val, cpx, b)
self.assertEqual(result1, result2)
self.assertEqual(result1,
VirtualMethods.virtualMethod0(duck, pt, val, cpx, b) * self.multiplier)
duck.virtualMethod0 = None
def testMonkeyPatchOnMethodWithStaticAndNonStaticOverloads(self):
'''Injects new 'exists' on a SimpleFile instance and makes C++ call it.'''
simplefile = SimpleFile('foobar')
# Static 'exists'
simplefile.exists('sbrubbles')
self.assertFalse(self.duck_method_called)
# Non-static 'exists'
simplefile.exists()
self.assertFalse(self.duck_method_called)
def myExists(obj):
self.duck_method_called = True
return False
simplefile.exists = MethodTypeCompat(myExists, simplefile)
# Static 'exists' was overridden by the monkey patch, which accepts 0 arguments
self.assertRaises(TypeError, simplefile.exists, 'sbrubbles')
# Monkey patched exists
simplefile.exists()
self.assertTrue(self.duck_method_called)
simplefile.exists = None
def testMonkeyPatchOnMethodWithStaticAndNonStaticOverloadsWithInheritance(self):
'''Injects new 'exists' on an object that inherits from SimpleFile and makes C++ call it.'''
monkey = Monkey('foobar')
# Static 'exists'
monkey.exists('sbrubbles')
self.assertFalse(self.duck_method_called)
# Non-static 'exists'
monkey.exists()
self.assertFalse(self.duck_method_called)
def myExists(obj):
self.duck_method_called = True
return False
monkey.exists = MethodTypeCompat(myExists, monkey)
# Static 'exists' was overridden by the monkey patch, which accepts 0 arguments
self.assertRaises(TypeError, monkey.exists, 'sbrubbles')
# Monkey patched exists
monkey.exists()
self.assertTrue(self.duck_method_called)
monkey.exists = None
def testForInfiniteRecursion(self):
def myVirtualMethod0(obj, pt, val, cpx, b):
self.call_counter += 1
return VirtualMethods.virtualMethod0(obj, pt, val, cpx, b)
vm = VirtualMethods()
vm.virtualMethod0 = MethodTypeCompat(myVirtualMethod0, vm)
pt, val, cpx, b = Point(1.1, 2.2), 4, complex(3.3, 4.4), True
vm.virtualMethod0(pt, val, cpx, b)
self.assertEqual(self.call_counter, 1)
if __name__ == '__main__':
unittest.main()
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