test-network: add test for small MTU for vcan

Prompted by https://github.com/systemd/systemd/issues/30140#issuecomment-1837973580.
2023-12-08 10:47:42 +09:00
parent 941f8e1399
commit 470a329d98
4 changed files with 23 additions and 2 deletions
@@ -1725,10 +1725,20 @@ class NetworkdNetDevTests(unittest.TestCase, Utilities):

    @expectedFailureIfModuleIsNotAvailable('vcan')
    def test_vcan(self):
-        copy_network_unit('25-vcan.netdev', '26-netdev-link-local-addressing-yes.network')
+        copy_network_unit('25-vcan.netdev', '26-netdev-link-local-addressing-yes.network',
+                          '25-vcan98.netdev', '25-vcan98.network')
        start_networkd()

-        self.wait_online(['vcan99:carrier'])
+        self.wait_online(['vcan99:carrier', 'vcan98:carrier'])
+
+        # https://github.com/systemd/systemd/issues/30140
+        output = check_output('ip -d link show vcan99')
+        print(output)
+        self.assertIn('mtu 16 ', output)
+
+        output = check_output('ip -d link show vcan98')
+        print(output)
+        self.assertIn('mtu 16 ', output)

    @expectedFailureIfModuleIsNotAvailable('vxcan')
    def test_vxcan(self):