test: make full discovery optional-state independent

tests/test_principal_cache.py

@@ -14,11 +14,22 @@ from govoplan_core.core.principal_cache import (
     auth_principal_revision,
     invalidate_auth_principals,
 )
+from govoplan_core.core.runtime import (
+    clear_runtime,
+    configure_runtime,
+    get_runtime_context,
+)
 from govoplan_core.db.base import Base
 
 
 class AuthPrincipalRevisionTests(unittest.TestCase):
     def setUp(self) -> None:
+        # These tests create only the Core change-sequence tables. Keep them
+        # independent of a registry configured by an earlier discovery test;
+        # that registry may expose an optional durable Audit outbox whose
+        # tables intentionally are not part of this fixture.
+        self._runtime_context = get_runtime_context()
+        clear_runtime()
         self.engine = create_engine("sqlite:///:memory:")
         Base.metadata.create_all(
             bind=self.engine,
@@ -31,6 +42,10 @@ class AuthPrincipalRevisionTests(unittest.TestCase):
 
     def tearDown(self) -> None:
         self.engine.dispose()
+        if self._runtime_context is None:
+            clear_runtime()
+        else:
+            configure_runtime(self._runtime_context)
 
     def test_revisions_are_tenant_scoped_and_include_system_changes(self) -> None:
         with self.SessionLocal() as session: