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[Python-ideas] unittest: assertEqual(a, b, msg): Show diff AND msg

Thomas Güttler guettliml at thomas-guettler.de
Wed Apr 27 03:49:06 EDT 2016 
I opened a docs issue for "longMessage" http://bugs.python.org/issue26869


Am 26.04.2016 um 10:06 schrieb Thomas Güttler:
>
>
> Am 25.04.2016 um 19:35 schrieb Gregory P. Smith:
>>
>> On Mon, Apr 25, 2016 at 12:47 AM Thomas Güttler <guettliml at thomas-guettler.de <mailto:guettliml at thomas-guettler.de>>
>> wrote:
>>
>>     Up to now assertEqual(a, b, msg) outputs only the msg, not the diff.
>>
>>     I know that setting longMessage to True shows the diff and the msg[1]
>>
>>     I think the sane default is to show the diff and the message for assertEqual().
>>
>>     What do you think?
>>
>>
>> longMessage already defaults to True in Python 3.
>> https://hg.python.org/cpython/file/default/Lib/unittest/case.py#l371
>>
>> Changing the default in a future Python 2.7.xx release is unlikely as that kind of change can catch people by surprise
>> and cause problems in the middle of a stable release.
>
> Thank you Gregory! I was blind.
>
> First I read the Python2 docs, then I read the first line of the docs of Python3:
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>
>     If set to True then any explicit failure  .....
>
> https://docs.python.org/3/library/unittest.html#unittest.TestCase.longMessage
>
> Yes, Python3 has the better default. Maybe the docs should get updated.
> I guess the above sentence was copied from the old docs where you had to set True.
>
> "If set to True then ..." is correct if you have a "math brain". But it is confusing
> for new comers.
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>
>
>

-- 
Thomas Guettler http://www.thomas-guettler.de/
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