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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# This file is part of the Shiboken Python Bindings Generator project.
#
# Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
#
# Contact: PySide team <contact@pyside.org>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public License
# version 2.1 as published by the Free Software Foundation. Please
# review the following information to ensure the GNU Lesser General
# Public License version 2.1 requirements will be met:
# http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
# #
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301 USA
'''Test cases for virtual methods.'''
import types
import unittest
from sample import VirtualMethods, SimpleFile, Point
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
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 = types.MethodType(myVirtualMethod0, vm, VirtualMethods)
result1 = vm.callVirtualMethod0(pt, val, cpx, b)
self.assert_(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)
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 = types.MethodType(myVirtualMethod0, duck, Duck)
result1 = duck.callVirtualMethod0(pt, val, cpx, b)
self.assert_(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)
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 = types.MethodType(myExists, simplefile, 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.assert_(self.duck_method_called)
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 = types.MethodType(myExists, monkey, SimpleFile)
# Static 'exists' was overridden by the monkey patch, which accepts 0 arguments
self.assertRaises(TypeError, monkey.exists, 'sbrubbles')
# Monkey patched exists
monkey.exists()
self.assert_(self.duck_method_called)
if __name__ == '__main__':
unittest.main()
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