Bug#835886: gnome-photos: please use dbus-run-session to run tests

[Simon McVittie]

Source: gnome-photos
Version: 3.20.3-1
Severity: normal
Tags: upstream
User: dbus at packages.debian.org
Usertags: dbus-launch dbus-launch-for-tests

As described in <https://lists.debian.org/debian-devel/2016/08/msg00554.html>
I'm trying to reduce how much dbus-launch is used in Debian.
This package currently depends on dbus-x11, apparently to run tests.

It should be possible to replace dbus-x11 as follows:

* replace the test dependency on dbus-x11 with dbus (>= 1.8)
* replace "xvfb-run -a make -C tests check" with
  "dbus-run-session -- xvfb-run -a make -C tests check"

Thanks,
    S