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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>
<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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