fix: ensure asyncpg_engine is asserted during app startup and use the same black magic for testing

Author: sanderegg

services/api-server/src/simcore_service_api_server/core/events.py

@@ -24,6 +24,7 @@ async def _on_startup() -> None:
             await connect_to_db(app)
             await asyncpg_connect_to_db(app, app.state.settings.API_SERVER_POSTGRES)
             assert app.state.engine  # nosec
+            assert app.state.asyncpg_engine  # nosec
 
         print(APP_STARTED_BANNER_MSG, flush=True)  # noqa: T201
 

services/api-server/tests/unit/conftest.py

@@ -212,6 +212,8 @@ def auth(
         engine.freesize = 3
         engine.maxsize = 10
         app.state.engine = engine
+        async_engine = mocker.MagicMock()
+        app.state.asyncpg_engine = async_engine
 
     # NOTE: here, instead of using the database, we patch repositories interface
     mocker.patch(