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

[Kenichi Handa]

In article <6zju35ux8.fsf@fencepost.gnu.org>, Glenn Morris <rgm@gnu.org> writes:

> Current trunk, GNU/Linux, make check is broken by recent changes related
> to coding systems (I suspect):

> make check
> ...
> Converting iCalendar...done
>    passed  122/331  icalendar-import-with-uid
[...]
> Saving file /tmp/icalendar-test-diary133276Qn...
> Select coding system (default chinese-iso-8bit): 

> ...hangs waiting for input.

I've just committed a fix to the trunk.  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.  Isn't it better to
execute each test file in its own Emacs session?

---
Kenichi Handa
handa@gnu.org