test-network: add test case of an empty string assignment for Address=

diff --git a/test/test-network/conf/25-address-static.network.d/20-clear-addresses.conf b/test/test-network/conf/25-address-static.network.d/20-clear-addresses.conf
new file mode 100644 (file)
index 0000000..a38b07c
--- /dev/null
+++ b/test/test-network/conf/25-address-static.network.d/20-clear-addresses.conf
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+[Network]
+# An empty string clears previously configured addresses.
+Address=
+Address=10.4.0.1/16

diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index a3f3c6085cb0362362c620ae8557eee3f0780bc7..6af6e6dc10f1745e17ebd2c057563817cfb3dfe9 100755 (executable)
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -2756,6 +2756,15 @@ class NetworkdNetworkTests(unittest.TestCase, Utilities):
         for i in range(1, 254):
             self.assertIn(f'inet 10.3.3.{i}/16 brd 10.3.255.255', output)
 
+        # test for an empty string assignment for Address= in [Network]
+        copy_network_unit('25-address-static.network.d/20-clear-addresses.conf')
+        networkctl_reload()
+        self.wait_online(['dummy98:routable'])
+        output = check_output('ip -4 address show dev dummy98')
+        for i in range(1, 254):
+            self.assertNotIn(f'inet 10.3.3.{i}/16 brd 10.3.255.255', output)
+        self.assertIn('inet 10.4.0.1/16 brd 10.4.255.255', output)
+
     def test_address_ipv4acd(self):
         check_output('ip netns add ns99')
         check_output('ip link add veth99 type veth peer veth-peer')