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Diffstat (limited to 'sources/shiboken2/tests/samplebinding/duck_punching_test.py')
| -rw-r--r-- | sources/shiboken2/tests/samplebinding/duck_punching_test.py | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/sources/shiboken2/tests/samplebinding/duck_punching_test.py b/sources/shiboken2/tests/samplebinding/duck_punching_test.py new file mode 100644 index 000000000..fd60a96af --- /dev/null +++ b/sources/shiboken2/tests/samplebinding/duck_punching_test.py @@ -0,0 +1,176 @@ +#!/usr/bin/env python +# -*- coding: utf-8 -*- +# +############################################################################# +## +## Copyright (C) 2016 The Qt Company Ltd. +## Contact: https://www.qt.io/licensing/ +## +## This file is part of the test suite of PySide2. +## +## $QT_BEGIN_LICENSE:GPL-EXCEPT$ +## 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 virtual methods.''' + +import types +import unittest +from py3kcompat import IS_PY3K + +from sample import VirtualMethods, SimpleFile, Point + +def MethodTypeCompat(func, instance): + if IS_PY3K: + return types.MethodType(func, instance) + else: + return types.MethodType(func, instance, type(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() + |