Add tests for dh_installgsettings

Extracted from the patch proposed in https://bugs.debian.org/934893.

Signed-off-by: Niels Thykier <niels@thykier.net>
Signed-off-by: Simon McVittie <smcv@debian.org>
3 jobs for master in 3 minutes and 31 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Test
passed #283991
tests-stable-backports

00:03:15

passed #283992
tests-testing

00:03:10

passed #283993
tests-unstable

00:03:30