tests: add integration tests for virtual-ethernets

tests/integration/veths.py

@@ -0,0 +1,91 @@
+#!/usr/bin/python3
+# Veths integration tests.
+#
+# These need to be run in a VM and do change the system
+# configuration.
+#
+# Copyright (C) 2023 Canonical, Ltd.
+# Author: Danilo Egea Gondolfo <[email protected]>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 3.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import sys
+import subprocess
+import unittest
+
+from base import IntegrationTestsBase, test_backends
+
+
+class _CommonTests():
+
+    def test_create_veth_pair(self):
+        self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'veth0'], stderr=subprocess.DEVNULL)
+        with open(self.config, 'w') as f:
+            f.write('''network:
+  renderer: %(r)s
+  version: 2
+  virtual-ethernets:
+    veth0:
+      dhcp4: false
+      dhcp6: false
+      peer: veth1
+    veth1:
+      dhcp4: false
+      dhcp6: false
+      peer: veth0''' % {'r': self.backend})
+        self.generate_and_settle(['veth0', 'veth1'])
+        self.assert_iface_up('veth0')
+        self.assert_iface_up('veth1')
+
+    def test_create_veth_pair_with_ip_address(self):
+        self.addCleanup(subprocess.call, ['ip', 'link', 'delete', 'veth0'], stderr=subprocess.DEVNULL)
+        with open(self.config, 'w') as f:
+            f.write('''network:
+  renderer: %(r)s
+  version: 2
+  virtual-ethernets:
+    veth0:
+      dhcp4: false
+      dhcp6: false
+      peer: veth1
+      addresses:
+        - 192.168.123.123/24
+        - 1234:FFFF::42/64
+    veth1:
+      dhcp4: false
+      dhcp6: false
+      peer: veth0''' % {'r': self.backend})
+        self.generate_and_settle(['veth0', 'veth1'])
+        self.assert_iface_up('veth0')
+        self.assert_iface_up('veth1')
+
+        expected_ips = {'192.168.123.123', '1234:ffff::42'}
+        json = self.iface_json('veth0')
+        data = json.get('addr_info', {})
+        ips = {ip.get('local') for ip in data}
+        self.assertTrue(expected_ips.issubset(ips))
+
+
+@unittest.skipIf("networkd" not in test_backends,
+                 "skipping as networkd backend tests are disabled")
+class TestNetworkd(IntegrationTestsBase, _CommonTests):
+    backend = 'networkd'
+
+
+@unittest.skipIf("NetworkManager" not in test_backends,
+                 "skipping as NetworkManager backend tests are disabled")
+class TestNetworkManager(IntegrationTestsBase, _CommonTests):
+    backend = 'NetworkManager'
+
+
+unittest.main(testRunner=unittest.TextTestRunner(stream=sys.stdout, verbosity=2))