bug#14781: coding system changes cause make check to hang in icalendar tests

[Glenn Morris]

Kenichi Handa wrote:

> I've just committed a fix to the trunk.

Thanks.

>  Actually, the culprit was test/automated/decoder-tests.el which
> changes priorities of coding systems. I didn't know that all tests
> under test/automated are executed in a single Emacs session, and thus
> they must be side-effect free.

I think they should all be side-effect free (as much as possible)
anyway. Someone might well want to run an individual test in an existing
Emacs session, without that session getting messed up.

> Isn't it better to execute each test file in its own Emacs session?

I don't know. Running them all in one is the only way to get the final
number of tests run / passed / failed to be accurate. Running them in
separate Emacs's would allow them to run in parallel, which would be
faster, but might be confusing?