+ introduce MachinePool "connection_uri" unique index.

Closes #245

Author: Atin65536

genesis_core/tests/functional/conftest.py

@@ -915,3 +915,72 @@ def setup_db_for_worker(worker_id):
         engine.close_connection(conn)
         del engine
         engines.engine_factory.destroy_engine()
+
+
+
+@pytest.fixture(scope="session")
+def main_db_url() -> str:
+    return consts.get_database_uri()
+
+
+@pytest.fixture(scope="session")
+def test_db_name(worker_id: tp.Any) -> str:
+    return "test" if not worker_id else f"test_{worker_id}"
+
+
+@pytest.fixture(scope="session")
+def test_db_url(main_db_url: str, test_db_name: str) -> str:
+    parsed_db_url = urlparse(main_db_url)
+    return parsed_db_url._replace(path=test_db_name).geturl()
+
+
+@pytest.fixture(scope="session")
+def test_db(
+    main_db_url: str,
+    test_db_url: str,
+    test_db_name: str,
+) -> tp.Iterable[
+    test_utils.TestDBManager
+]:
+    class MainDBManager(test_utils.TestDBManager):
+        manager_config = test_utils.TestDBManagerConfig(
+            database_url=main_db_url,
+            create_db=test_db_name,
+            engine_alias="test_main",
+        )
+
+    class TestDBManager(test_utils.TestDBManager):
+        manager_config = test_utils.TestDBManagerConfig(
+            database_url=test_db_url,
+            engine_alias="test",
+        )
+
+    with MainDBManager() as main_db_manager:
+        with main_db_manager.db():
+            with TestDBManager() as test_db_manager:
+                yield test_db_manager
+
+
+@pytest.fixture(scope="session")
+def test_migrations_manager(
+    test_db: test_utils.TestDBManager,
+) -> tp.Iterable[None]:
+    class TestMigrationManager(test_utils.TestMigrationManager):
+        migration_config = test_utils.TestMigrationManagerConfig(
+            first_migration=FIRST_MIGRATION,
+        )
+
+    with TestMigrationManager(db_manager=test_db) as migration_manager:
+        with migration_manager.migrations():
+            yield
+
+
+@pytest.fixture()
+def test_session(
+    test_db: test_utils.TestDBManager,
+    test_migrations_manager: None,
+) -> tp.Iterable[
+    test_utils.AbstractSession
+]:
+    with test_db.session() as session:
+        yield session

genesis_core/tests/functional/dm/__init__.py

@@ -0,0 +1,119 @@
+#    Copyright 2026 Genesis Corporation.
+#
+#    All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import typing as tp
+
+import pytest
+
+from restalchemy.storage import exceptions
+
+from genesis_core.compute.dm.models import MachinePool
+from genesis_core.tests.functional import utils as test_utils
+
+
+DictStrAny = tp.Dict[str, tp.Any]
+
+
+class DriverSpecWithException(tp.TypedDict):
+    driver_spec: tp.Optional[
+        DictStrAny
+    ]
+
+    exception: tp.Optional[
+        tp.Type[Exception]
+    ]
+
+
+DEFAULT_MACHINE_POOL_CONNECTION_URI = "qemu://system"
+DEFAULT_DRIVER_SPEC_WITH_EXCEPTION = DriverSpecWithException(
+    driver_spec={"connection_uri": DEFAULT_MACHINE_POOL_CONNECTION_URI},
+    exception=None,
+)
+
+
+class PoolFactory(tp.Protocol):
+    def __call__(self, *, driver_spec: DictStrAny) -> DictStrAny:
+        ...
+
+
+@pytest.mark.parametrize(
+    "driver_specs_with_exceptions",
+    [
+        pytest.param(
+            [
+                DEFAULT_DRIVER_SPEC_WITH_EXCEPTION,
+            ],
+            id="single-insert"
+        ),
+        pytest.param(
+            [
+                DriverSpecWithException(driver_spec=None, exception=None),
+            ],
+            id="none-driver-spec",
+        ),
+        pytest.param(
+            [
+                DriverSpecWithException(driver_spec={}, exception=None),
+            ],
+            id="empty-dict-driver-spec",
+        ),
+        pytest.param(
+            [
+                DriverSpecWithException(
+                    driver_spec={"connection_uri": None},
+                    exception=None,
+                ),
+            ],
+            id="empty-connection-uri-driver-spec",
+        ),
+        pytest.param(
+            [
+                DriverSpecWithException(driver_spec=None, exception=None),
+                DriverSpecWithException(driver_spec=None, exception=None),
+            ],
+            id="allow-connection-uri-null-duplicate",
+        ),
+        pytest.param(
+            [
+                DEFAULT_DRIVER_SPEC_WITH_EXCEPTION,
+                DriverSpecWithException(
+                    driver_spec={
+                        "connection_uri": DEFAULT_MACHINE_POOL_CONNECTION_URI,
+                    },
+                    exception=exceptions.ConflictRecords,
+                )
+            ],
+            id="disallow-duplicate-connection-uri",
+        ),
+    ],
+)
+def test_connection_uri_idx(
+    driver_specs_with_exceptions: tp.List[DriverSpecWithException],
+    test_session: test_utils.AbstractSession,
+    pool_factory: PoolFactory,
+):
+    for param in driver_specs_with_exceptions:
+        machine_pool = MachinePool.restore_from_simple_view(
+            **pool_factory(
+                driver_spec=param["driver_spec"],
+            )
+        )
+
+        if param["exception"] is None:
+            machine_pool.insert(session=test_session)
+        else:
+            with pytest.raises(param["exception"]):
+                machine_pool.insert(session=test_session)