Subject: bug#51037: [PATCH] Make `print-level` & `print-length` customizable in ERT batch tests

From: Lars Ingebrigtsen <[email-masked]>
Date: Wed, 06 Oct 2021 11:30:03 +0200

Michael <[email-masked]> writes:

> When running ERT tests in batch mode, the conservative values
> chosen for `print-level` and `print-length` sometimes make it
> difficult to see what exactly is wrong.  This patch introduces
> two new variables (`ert-batch-print-level` &
> `ert-batch-print-length`) that one can use to customize them;
> e.g.
>
>    emacs -batch -l ert -l my-tests.el \
>          --eval "(let ((ert-batch-print-level 10) \
>                        (ert-batch-print-length 120)) \
>                    (ert-run-tests-batch-and-exit))"

Sounds like a good idea.

> +MESSAGE-FN should normally be nil; it is used for automated
> +self-tests and specify how to display messages."

I don't understand this bit, though.  If you want to test how this
function outputs messages, you can just `cl-letf' like this:

(cl-letf (((symbol-function 'message) ...

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no