Add cross-module operational and interaction contracts

tests/test_celery_queue_contract.py

@@ -0,0 +1,34 @@
+from __future__ import annotations
+
+import unittest
+
+from govoplan_core.celery_app import celery
+from govoplan_core.settings import settings
+
+
+class CeleryQueueContractTests(unittest.TestCase):
+    def test_default_worker_queues_cover_every_routed_task(self) -> None:
+        configured = {
+            value.strip()
+            for value in settings.celery_queues.split(",")
+            if value.strip()
+        }
+        routes = celery.conf.task_routes
+        self.assertIsInstance(routes, dict)
+        routed = {
+            str(route["queue"])
+            for route in routes.values()
+            if isinstance(route, dict) and route.get("queue")
+        }
+
+        self.assertEqual(set(), routed - configured)
+
+    def test_delivery_tasks_keep_worker_loss_protection(self) -> None:
+        self.assertTrue(celery.conf.task_acks_late)
+        self.assertTrue(celery.conf.task_reject_on_worker_lost)
+        self.assertEqual(1, celery.conf.worker_prefetch_multiplier)
+
+
+if __name__ == "__main__":
+    unittest.main()
+