[glib/wip/seb128/skip-memory-tests-if-portal-missing] tests: Skip GMemoryMonitor tests if xdg-desktop-portal is not available

[Sebastien Bacher <sbacher src gnome org>]

commit 422e86163346c4959e70d663c686765fb17c504a
Author: Sebastien Bacher <seb128 ubuntu com>
Date:   Wed Jan 22 10:19:03 2020 +0200

    tests: Skip GMemoryMonitor tests if xdg-desktop-portal is not available
    
    It's useful to have glib tests passing even if you don't have a full
    desktop stack available

 gio/tests/memory-monitor-portal.py.in | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
---
diff --git a/gio/tests/memory-monitor-portal.py.in b/gio/tests/memory-monitor-portal.py.in
index cd7d741b1..ae6d59d12 100755
--- a/gio/tests/memory-monitor-portal.py.in
+++ b/gio/tests/memory-monitor-portal.py.in
@@ -51,7 +51,11 @@ class TestLowMemoryMonitorPortal(dbusmock.DBusTestCase):
         fcntl.fcntl(self.p_mock.stdout, fcntl.F_SETFL, flags | os.O_NONBLOCK)
         self.last_warning = -1
         self.dbusmock = dbus.Interface(self.obj_lmm, dbusmock.MOCK_IFACE)
-        self.xdp = subprocess.Popen([XDG_DESKTOP_PORTAL_PATH])
+        try:
+            self.xdp = subprocess.Popen([XDG_DESKTOP_PORTAL_PATH])
+        except FileNotFoundError:
+            raise unittest.SkipTest("xdg-desktop-portal not available")
+
         try:
             self.wait_for_bus_object('org.freedesktop.portal.Desktop',
                                      '/org/freedesktop/portal/desktop')