[mutter] mutter-all.test: Run tests in a environment with display and bus set

[Marge Bot <marge-bot src gnome org>]

commit 14c8f5f94c2d8b91b17184c9d7eb7c060fc1176c
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Wed May 26 21:07:41 2021 +0200

    mutter-all.test: Run tests in a environment with display and bus set
    
    The mutter tests require to run in a valid environment where a display
    is available and a session bus, however currently we rely on the current
    environment, and this may lead to unexpected behaviors.
    
    So let's just ensure that a display is running through xvfb-run and
    that a session bus is running in a temporary directory.
    
    We also ensure to use the gsettings memory backend, even because by
    setting TestEnvironment we ensure that no other env variable is leaked
    to the test.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1876>

 src/tests/mutter-all.test.in | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/src/tests/mutter-all.test.in b/src/tests/mutter-all.test.in
index 3078ff67e8..6e103c51d0 100644
--- a/src/tests/mutter-all.test.in
+++ b/src/tests/mutter-all.test.in
@@ -1,5 +1,6 @@
 [Test]
 Description=All Mutter tests
-Exec=@libexecdir@/installed-tests/mutter-@apiversion@/mutter-test-runner --all
+TestEnvironment=GSETTINGS_BACKEND=memory;
+Exec=sh -c 'env XDG_RUNTIME_DIR="$(mktemp -d -t mutter-@apiversion@-all-tests-XXXXXX)" dbus-run-session -- 
xvfb-run -a -s "+iglx -noreset" -- @libexecdir@/installed-tests/mutter-@apiversion@/mutter-test-runner --all'
 Type=session
 Output=TAP