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On 8/29/2012 9:34 AM, Alexander O'Donovan-Jones wrote:<br>
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Segoe
UI","sans-serif"">Does anyone know of a way
to mock out the .decode(…) method on a string?<o:p></o:p></span></p>
<p class="MsoNormal">I have a piece of code which essentially
does this:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas">def
CoerceToUnicode(inputString, encoding='cp1252'):<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> try:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> ret =
inputString.decode(encoding)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> except (UnicodeDecodeError,
UnicodeEncodeError):<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> ret = inputString<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> return ret<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">However if I try to mock out the str.decode
method I get an exception thrown:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas">def
test_CoerceToUnicode_DecodeException(self):<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> # we mock out the decoding
method to throw an exception and check the return<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> with
mock.patch('__builtin__.str.decode',
side_effect=UnicodeDecodeError):<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> # simple test cases of
ascii strings in non-unicode and unicode formats<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas">
self.assertEqual(CoerceToUnicode('asdf'), 'asdf')<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas">
self.assertEqual(CoerceToUnicode(u'asdf'), u'asdf')<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Segoe
UI","sans-serif"">raises:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Segoe
UI","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas">Traceback (most recent call
last):<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> File
"c:\depot\eveLauncher\libs\test\test_localization.py", line
220, in test_CoerceToUnicode_DecodeException<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> with
mock.patch('__builtin__.str.decode',
side_effect=UnicodeDecodeError):<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> File
"build\bdist.win32\egg\mock.py", line 1348, in __enter__<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas"> setattr(self.target,
self.attribute, new_attr)<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span
style="font-family:Consolas">TypeError: can't set attributes
of built-in/extension type 'str'<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone have experience with mocking
out things like this?<o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Segoe
UI","sans-serif";color:#1F497D">Thanks!<o:p></o:p></span></p>
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<br>
This doesn't seem like a good use of mocking. Why not just pass in
an inputString and encoding that together raise the error?<br>
<br>
--Ned.<br>
<br>
<blockquote
cite="mid:98D0F3AAB54DF646B187C3D80D0CCFE406ED4EA1@RKV-IT-EXCH103.ccp.ad.local"
type="cite">
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Segoe
UI","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Segoe
UI","sans-serif";color:#1F497D">Alex
O’Donovan-Jones<o:p></o:p></span></p>
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