d/tests/installed-tests: Run installed-tests

Mark them as flaky for now due to some known failures (which succeed
at build-time, so they are presumably solvable).

Closes: #908440

debian/tests/control

@@ -1,3 +1,7 @@
 Tests: build python3-gi
 Depends: libgtk-3-dev, build-essential, xauth, xvfb, python3-gi, gir1.2-gtk-3.0, dbus
 Restrictions: allow-stderr
+
+Tests: installed-tests
+Depends: at-spi2-core, dbus (>= 1.8), gnome-desktop-testing (>= 2018.1-1~), gtk-3-examples, xauth, xvfb
+Restrictions: allow-stderr, flaky

debian/tests/installed-tests

@@ -0,0 +1,19 @@
+#!/bin/sh
+# autopkgtest check: Run the installed-tests to verify GTK+ works correctly
+# Based on glib2.0's d/tests/installed-tests, (C) 2013 Canonical Ltd.
+
+set -e
+
+# Disable gvfs if it happens to be installed. We want to test the built-in
+# stuff
+export GIO_USE_VFS=local
+export GIO_USE_VOLUME_MONITOR=unix
+
+export XDG_RUNTIME_DIR="$AUTOPKGTEST_TMP"
+
+exec dbus-run-session -- \
+xvfb-run -a \
+gnome-desktop-testing-runner \
+--report-directory="$AUTOPKGTEST_ARTIFACTS" \
+--tap \
+gtk+