Eli Zaretskii <eliz@gnu.org> writes:

>> From: Matt Armstrong <matt@rfc20.org>
>> Date: Fri, 04 Nov 2022 15:53:05 -0700
>>
>> Rationale is in the commit description, but it boils down to these tests
>> being annoying for me recently.  I like to M-x eval-buffer and run tests
>> interactively, but these tests seemed to work nicely only in batch mode.
>> In interactive mode they would both fail and issue annoying prompts
>> "save this modified buffer?" prompts.  In fixing them, I figured out
>> what they were trying to test and attempted to make that more robust and
>> clear.
>
> Thanks, I installed this.
>
> However, the tests are still quite talkative, and emit a lot of stuff
> for which I see no purpose.  Can we shut up those "BEGIN
> overlay-modification-hooks test-case ((insert-at . 1))" messages and
> also the "Auto-saving...", "Auto-saving...done"?  Or do they serve
> some useful purpose?

See the attached patch, which either removes noisy messages or replaces
them with `ert-info'.  I didn't know about `ert-info' when I added the
noisy messages.

As for the "Auto-saving..." messages, they are printed by calls to
`message1' in fileio.c.  There may be a way to hide them, but see the
next paragraph.

There is a behavior difference between ert's interactive runner and
batch runner.  In interactive mode all `message' output is redirected to
a buffer normally hidden, made visible only by request after the test
runs, and I expect people will look at these only when debugging failed
tests.  In batch mode `message' output is printed to stdout (or maybe
stderr) by default, mixed with ert's other output.  It may be possible
to change ert's batch runner to hide each test's `message' output,
perhaps printing it only if the test fails.  Do we have a person who is
familiar with ert that we can run this idea by?

For example, this kind of noise would also be eliminated by such a
change:

   passed  35/48  simple-tests--undo (0.000591 sec)
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   passed  36/48  simple-tests--undo-equiv-table (0.000453 sec)
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