Narrow Files backend import surfaces

tests/test_access_provider.py

@@ -21,6 +21,7 @@ GROUP_ID = "group-1"
 class FilesAccessProviderTests(unittest.TestCase):
     def test_file_access_provider_explains_owner_share_admin_and_missing_resources(self) -> None:
         session = _session()
+        self.addCleanup(_close_session, session)
         _seed_access_subjects(session)
         owned = FileAsset(id="file-owned", tenant_id=TENANT_ID, owner_type="user", owner_user_id=USER_ID, display_path="owned.pdf", filename="owned.pdf")
         shared = FileAsset(id="file-shared", tenant_id=TENANT_ID, owner_type="user", owner_user_id=OTHER_USER_ID, display_path="shared.pdf", filename="shared.pdf")
@@ -46,6 +47,7 @@ class FilesAccessProviderTests(unittest.TestCase):
 
     def test_file_access_provider_explains_persisted_and_virtual_folders(self) -> None:
         session = _session()
+        self.addCleanup(_close_session, session)
         _seed_access_subjects(session)
         persisted = FileFolder(id="folder-persisted", tenant_id=TENANT_ID, owner_type="group", owner_group_id=GROUP_ID, path="records")
         virtual_child = FileAsset(
@@ -80,6 +82,12 @@ def _session():
     return sessionmaker(bind=engine, future=True)()
 
 
+def _close_session(session) -> None:
+    engine = session.get_bind()
+    session.close()
+    engine.dispose()
+
+
 def _seed_access_subjects(session) -> None:
     session.add_all([
         Account(id="account-1", email="one@example.test", normalized_email="one@example.test"),