While the test was correct and checked if there is only
`record.db` in a given dir (and no other files) it wouldn't
tell us whether the file wasn't there or there were additional
files found. Hence replace the test by assertions that tell
use exactly what failed easing debugging in CI.
Fixes: e4bd4580 ("tests: Add application shutdown tests")
Signed-off-by: Guido Günther <agx@sigxcpu.org>
Part-of: <https://gitlab.gnome.org/GNOME/calls/-/merge_requests/795>
Rather use gapplication service. This makes the flow similar to what
Chatty does and makes us hold/release rather than having an application
window.
It also allows us to drop the --daemon.
Part-of: <https://gitlab.gnome.org/GNOME/calls/-/merge_requests/760>
gtk_test_init() ends up calling gtk_init() which tries opening
the default display. CI jobs sometimes seem to trip over this
even when run through xvfb-run. Therefore we use g_test_init()
instead.
