[PATCH] test: add simple tests for post-insert hook

[David Bremner]

Jani Nikula <jani at nikula.org> writes:

>
> I presume the two lines above...
>
>> +notmuch insert < "$gen_msg_filename"
>> +echo $?
>
> ...and this line are leftover debug messages?

Uh, yeah. I should have fixed those a while ago when Tomi pointed them
out.

>
> Otherwise LGTM. I guess this could be expanded with a subtest checking
> that the hook does not get run on errors, and does get run with some
> errors that are ignored with --keep.

OK, I pushed these tests for now (less the debugging output).

d