1 files changed, 93 insertions, 0 deletions
diff --git a/tests/integration_tests/test_networking.py b/tests/integration_tests/test_networking.py
new file mode 100644
index 00000000..cde69afc
--- /dev/null
+++ b/tests/integration_tests/test_networking.py
@@ -0,0 +1,93 @@
+"""Networking-related tests."""
+import pytest
+import yaml
+
+from tests.integration_tests.instances import IntegrationInstance
+from tests.integration_tests.integration_settings import PLATFORM
+
+
+def _add_dummy_bridge_to_netplan(client: IntegrationInstance):
+    # Update netplan configuration to ensure it doesn't change on reboot
+    netplan = yaml.safe_load(
+        client.execute("cat /etc/netplan/50-cloud-init.yaml")
+    )
+    # Just a dummy bridge to do nothing
+    try:
+        netplan["network"]["bridges"]["dummy0"] = {"dhcp4": False}
+    except KeyError:
+        netplan["network"]["bridges"] = {"dummy0": {"dhcp4": False}}
+
+    dumped_netplan = yaml.dump(netplan)
+    client.write_to_file("/etc/netplan/50-cloud-init.yaml", dumped_netplan)
+
+
+USER_DATA = """\
+#cloud-config
+updates:
+  network:
+    when: [boot]
+"""
+
+
+@pytest.mark.skipif(
+    PLATFORM not in ("lxd_container", "lxd_vm"),
+    reason=(
+        f"{PLATFORM} could make nic changes in a reboot event invalidating"
+        f" these tests."
+    ),
+)
+@pytest.mark.user_data(USER_DATA)
+class TestNetplanGenerateBehaviorOnReboot:
+    def test_skip(self, client: IntegrationInstance):
+        log = client.read_from_file("/var/log/cloud-init.log")
+        assert "Applying network configuration" in log
+        assert "Selected renderer 'netplan'" in log
+        client.execute(
+            "mv /var/log/cloud-init.log /var/log/cloud-init.log.bak"
+        )
+        netplan = yaml.safe_load(
+            client.execute("cat /etc/netplan/50-cloud-init.yaml")
+        )
+
+        client.restart()
+
+        log = client.read_from_file("/var/log/cloud-init.log")
+        assert "Event Allowed: scope=network EventType=boot" in log
+        assert "Applying network configuration" in log
+        assert "Running command ['netplan', 'generate']" not in log
+        assert (
+            "skipping call to `netplan generate`."
+            " reason: identical netplan config"
+        ) in log
+        netplan_new = yaml.safe_load(
+            client.execute("cat /etc/netplan/50-cloud-init.yaml")
+        )
+        assert netplan == netplan_new, "no changes expected in netplan config"
+
+    def test_applied(self, client: IntegrationInstance):
+        log = client.read_from_file("/var/log/cloud-init.log")
+        assert "Applying network configuration" in log
+        assert "Selected renderer 'netplan'" in log
+        client.execute(
+            "mv /var/log/cloud-init.log /var/log/cloud-init.log.bak"
+        )
+        # fake a change in the rendered network config file
+        _add_dummy_bridge_to_netplan(client)
+        netplan = yaml.safe_load(
+            client.execute("cat /etc/netplan/50-cloud-init.yaml")
+        )
+
+        client.restart()
+
+        log = client.read_from_file("/var/log/cloud-init.log")
+        assert "Event Allowed: scope=network EventType=boot" in log
+        assert "Applying network configuration" in log
+        assert (
+            "skipping call to `netplan generate`."
+            " reason: identical netplan config"
+        ) not in log
+        assert "Running command ['netplan', 'generate']" in log
+        netplan_new = yaml.safe_load(
+            client.execute("cat /etc/netplan/50-cloud-init.yaml")
+        )
+        assert netplan != netplan_new, "changes expected in netplan config"