tests:ethernets: wait-online DNS testing

Author: slyon

tests/integration/ethernets.py

@@ -460,12 +460,16 @@ def test_systemd_networkd_wait_online(self):
             # <dev_e2_client> should be listed normally
             self.assertEqual(f.read(), '''[Unit]
 ConditionPathIsSymbolicLink=/run/systemd/generator/network-online.target.wants/systemd-networkd-wait-online.service
+After=systemd-resolved.service
 
 [Service]
 ExecStart=
 ExecStart=/lib/systemd/systemd-networkd-wait-online -i %(e2c)s:carrier -i br0:degraded -i findme:carrier
-ExecStart=/lib/systemd/systemd-networkd-wait-online --any -o routable -i %(e2c)s -i br0
+ExecStart=/lib/systemd/systemd-networkd-wait-online --any --dns -o routable -i %(e2c)s -i br0
 ''' % {'e2c': self.dev_e2_client})
+        # Restart sd-nd-wait-online.service and check that it was launched correctly.
+        # XXX: Enable extra testing once systemd#34640 is available on the SUT (i.e. systemd v258+).
+        # subprocess.check_call(['systemctl', 'restart', 'systemd-networkd-wait-online.service'])
 
 
 @unittest.skipIf("NetworkManager" not in test_backends,