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

[Gregory P. Smith]

On Mon, Apr 25, 2016 at 12:47 AM Thomas Güttler <
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.

Setting it to true manually in all your 2.x code?  recommended!

-gps
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