1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
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()
|
