bug#22471: ert batch should print compile parsable error messages

[Philipp Stephani]

Am Do., 20. Aug. 2020 um 18:41 Uhr schrieb Lars Ingebrigtsen <larsi@gnus.org>:
>
> phillip.lord@russet.org.uk (Phillip Lord) writes:
>
> > Currently, when running in batch, ert prints out messages like so:
> >
> > Running 24 tests (2016-01-27 09:05:17+0000)
> >    passed   1/24  buffer-string=
> >    passed   2/24  buffer=
> > ...
> >    passed  22/24  sisyphus-test-with-find-file
> >    passed  23/24  to-string
> >    passed  24/24  with-temp-buffers
> >
> > Ran 24 tests, 23 results as expected, 1 unexpected (2016-01-27 
> > 09:05:18+0000)
> >
> > 1 unexpected results:
> >    FAILED  crash-out
> >
> > It would be nice to add some compilation-mode parsable data to this. So,
> > something like
> >
> >    passed   1/24  buffer-string=  (in ./test.sisyphus-test.el:22:)
>
> I think that would look rather cluttered for the "passed" lines, but it
> would indeed be helpful on the FAILED lines.
>

I'm doing something similar in my Bazel ruleset for Elisp
(https://github.com/phst/rules_elisp/blob/0b24aa1660af2f6c668899bdd78aaba383d7ac18/elisp/ert/runner.el#L446).
It would be nice to have an API for this as my code needs a few hacks
and subtleties.