test-network: add a tiny test for ID_NET_DRIVER= udev property

Test for #11721.

diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index 442ff09..6792e21 100755 (executable)
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -288,6 +288,11 @@ class NetworkdNetDevTests(unittest.TestCase, Utilities):
         self.assertNotRegex(output, '1 lo ')
         self.assertRegex(output, 'dropin-test')
 
+        output = subprocess.check_output(['networkctl', 'status', 'dropin-*']).rstrip().decode('utf-8')
+        self.assertNotRegex(output, '1 lo ')
+        self.assertRegex(output, 'dropin-test')
+        self.assertRegex(output, 'Driver: dummy')
+
     def test_bridge(self):
         self.copy_unit_to_networkd_unit_path('25-bridge.netdev')
         self.start_networkd()