[Python-ideas] Refactor Assertions Out of unittest.TestCase

[Daniel Watkins]

Hi Rob,

On Sat, Nov 30, 2013 at 10:38:31PM +1300, Robert Collins wrote:
> Have you seen Matchers? Inspired by hamcrest, these also move
> assertions out of unittest.TestCase, but are much more composable than
> assertions, and can give significantly richer errors.
> 
> http://testtools.readthedocs.org/en/latest/for-test-authors.html#matchers

I hadn't given it a proper look.  Very cool!  This looks like a much
more adaptable solution than mine.

> There is an open ticket in the Python bug tracker for getting
> something like this into the stdlib. I've been meaning to port them
> and get a review up for a bit :(.

Great!

Two things that (at a glance) testtools is missing are diffs to describe
mis-matches and support for the existing attributes (longMessage, maxDiff,
failureException, _diffThreshold) that unittest.TestCase uses to manage
output (though, obviously, at least two of these are diff-related).  Are
there any thoughts as to how to address this?

Is there anything I can do to help push matchers in to the stdlib?


Cheers,

Dan