Add a unit test for validating address pools

src/middlewared/middlewared/pytest/unit/plugins/docker/test_docker_address_pools_validtaion.py

@@ -0,0 +1,44 @@
+import pytest
+
+from middlewared.plugins.docker.validation_utils import validate_address_pools
+from middlewared.service_exception import ValidationErrors
+
+
+IP_IN_USE = [
+  {
+    'type': 'INET',
+    'address': '172.20.0.33',
+    'netmask': 16,
+    'broadcast': '172.20.0.63'
+  }
+]
+
+
+@pytest.mark.parametrize('user_specified_networks,error_msg', (
+    (
+        [],
+        'At least one address pool must be specified'),
+    (
+        [{'base': '172.20.2.0/24', 'size': 27}],
+        'Base network 172.20.2.0/24 overlaps with an existing system network'),
+    (
+        [{'base': '172.21.2.0/16', 'size': 10}],
+        'Base network 172.21.2.0/16 cannot be smaller than the specified subnet size 10'),
+    (
+        [{'base': '172.21.2.0/16', 'size': 27}, {'base': '172.21.2.0/16', 'size': 27}],
+        'Base network 172.21.2.0/16 is a duplicate of another specified network'
+    ),
+    (
+        [{'base': '172.21.0.0/16', 'size': 27}, {'base': '172.22.0.0/16', 'size': 27}],
+        ''
+    ),
+))
+@pytest.mark.asyncio
+async def test_address_pools_validation(user_specified_networks, error_msg):
+    if error_msg:
+        with pytest.raises(ValidationErrors) as ve:
+            validate_address_pools(IP_IN_USE, user_specified_networks)
+
+        assert ve.value.errors[0].errmsg == error_msg
+    else:
+        assert validate_address_pools(IP_IN_USE, user_specified_networks) is None