author | Lennard de Rijk <ljvderijk@gmail.com> |
Sat, 04 Jul 2009 14:19:39 +0200 | |
changeset 2528 | 9de8348890d8 |
parent 1000 | 9af147fc1f1c |
permissions | -rw-r--r-- |
1000
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Add pymox to tests folder.
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1 |
#!/usr/bin/python2.4 |
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2 |
# |
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3 |
# Copyright 2008 Google Inc. |
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4 |
# |
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5 |
# Licensed under the Apache License, Version 2.0 (the "License"); |
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6 |
# you may not use this file except in compliance with the License. |
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7 |
# You may obtain a copy of the License at |
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8 |
# |
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9 |
# http://www.apache.org/licenses/LICENSE-2.0 |
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10 |
# |
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11 |
# Unless required by applicable law or agreed to in writing, software |
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12 |
# distributed under the License is distributed on an "AS IS" BASIS, |
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13 |
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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14 |
# See the License for the specific language governing permissions and |
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15 |
# limitations under the License. |
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16 |
|
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17 |
import inspect |
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18 |
|
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19 |
class StubOutForTesting: |
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20 |
"""Sample Usage: |
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21 |
You want os.path.exists() to always return true during testing. |
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22 |
|
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23 |
stubs = StubOutForTesting() |
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24 |
stubs.Set(os.path, 'exists', lambda x: 1) |
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25 |
... |
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26 |
stubs.UnsetAll() |
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27 |
|
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28 |
The above changes os.path.exists into a lambda that returns 1. Once |
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29 |
the ... part of the code finishes, the UnsetAll() looks up the old value |
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30 |
of os.path.exists and restores it. |
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31 |
|
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32 |
""" |
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33 |
def __init__(self): |
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34 |
self.cache = [] |
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35 |
self.stubs = [] |
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36 |
|
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37 |
def __del__(self): |
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38 |
self.SmartUnsetAll() |
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39 |
self.UnsetAll() |
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40 |
|
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41 |
def SmartSet(self, obj, attr_name, new_attr): |
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42 |
"""Replace obj.attr_name with new_attr. This method is smart and works |
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43 |
at the module, class, and instance level while preserving proper |
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44 |
inheritance. It will not stub out C types however unless that has been |
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45 |
explicitly allowed by the type. |
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46 |
|
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47 |
This method supports the case where attr_name is a staticmethod or a |
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48 |
classmethod of obj. |
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49 |
|
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50 |
Notes: |
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51 |
- If obj is an instance, then it is its class that will actually be |
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52 |
stubbed. Note that the method Set() does not do that: if obj is |
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53 |
an instance, it (and not its class) will be stubbed. |
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54 |
- The stubbing is using the builtin getattr and setattr. So, the __get__ |
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55 |
and __set__ will be called when stubbing (TODO: A better idea would |
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56 |
probably be to manipulate obj.__dict__ instead of getattr() and |
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57 |
setattr()). |
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58 |
|
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59 |
Raises AttributeError if the attribute cannot be found. |
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60 |
""" |
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61 |
if (inspect.ismodule(obj) or |
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62 |
(not inspect.isclass(obj) and obj.__dict__.has_key(attr_name))): |
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63 |
orig_obj = obj |
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64 |
orig_attr = getattr(obj, attr_name) |
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65 |
|
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66 |
else: |
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67 |
if not inspect.isclass(obj): |
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68 |
mro = list(inspect.getmro(obj.__class__)) |
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69 |
else: |
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70 |
mro = list(inspect.getmro(obj)) |
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71 |
|
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72 |
mro.reverse() |
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73 |
|
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74 |
orig_attr = None |
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75 |
|
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76 |
for cls in mro: |
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77 |
try: |
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78 |
orig_obj = cls |
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79 |
orig_attr = getattr(obj, attr_name) |
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80 |
except AttributeError: |
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81 |
continue |
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82 |
|
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83 |
if orig_attr is None: |
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84 |
raise AttributeError("Attribute not found.") |
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85 |
|
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86 |
# Calling getattr() on a staticmethod transforms it to a 'normal' function. |
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87 |
# We need to ensure that we put it back as a staticmethod. |
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88 |
old_attribute = obj.__dict__.get(attr_name) |
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89 |
if old_attribute is not None and isinstance(old_attribute, staticmethod): |
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90 |
orig_attr = staticmethod(orig_attr) |
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91 |
|
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92 |
self.stubs.append((orig_obj, attr_name, orig_attr)) |
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93 |
setattr(orig_obj, attr_name, new_attr) |
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94 |
|
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95 |
def SmartUnsetAll(self): |
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96 |
"""Reverses all the SmartSet() calls, restoring things to their original |
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97 |
definition. Its okay to call SmartUnsetAll() repeatedly, as later calls |
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98 |
have no effect if no SmartSet() calls have been made. |
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99 |
|
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100 |
""" |
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101 |
self.stubs.reverse() |
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102 |
|
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103 |
for args in self.stubs: |
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104 |
setattr(*args) |
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105 |
|
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106 |
self.stubs = [] |
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107 |
|
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108 |
def Set(self, parent, child_name, new_child): |
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109 |
"""Replace child_name's old definition with new_child, in the context |
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110 |
of the given parent. The parent could be a module when the child is a |
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111 |
function at module scope. Or the parent could be a class when a class' |
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|
112 |
method is being replaced. The named child is set to new_child, while |
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113 |
the prior definition is saved away for later, when UnsetAll() is called. |
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|
114 |
|
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|
115 |
This method supports the case where child_name is a staticmethod or a |
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116 |
classmethod of parent. |
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117 |
""" |
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118 |
old_child = getattr(parent, child_name) |
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119 |
|
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120 |
old_attribute = parent.__dict__.get(child_name) |
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121 |
if old_attribute is not None and isinstance(old_attribute, staticmethod): |
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122 |
old_child = staticmethod(old_child) |
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123 |
|
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124 |
self.cache.append((parent, old_child, child_name)) |
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125 |
setattr(parent, child_name, new_child) |
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126 |
|
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127 |
def UnsetAll(self): |
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128 |
"""Reverses all the Set() calls, restoring things to their original |
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parents:
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129 |
definition. Its okay to call UnsetAll() repeatedly, as later calls have |
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130 |
no effect if no Set() calls have been made. |
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131 |
|
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132 |
""" |
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133 |
# Undo calls to Set() in reverse order, in case Set() was called on the |
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parents:
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134 |
# same arguments repeatedly (want the original call to be last one undone) |
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parents:
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135 |
self.cache.reverse() |
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136 |
|
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137 |
for (parent, old_child, child_name) in self.cache: |
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parents:
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138 |
setattr(parent, child_name, old_child) |
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139 |
self.cache = [] |