Clean Campaign audit and test resources

tests/test_access_provider.py

@@ -21,6 +21,7 @@ GROUP_ID = "group-1"
 class CampaignAccessProviderTests(unittest.TestCase):
     def test_campaign_access_provider_explains_owner_share_admin_and_missing_resources(self) -> None:
         session = _session()
+        self.addCleanup(_close_session, session)
         _seed_access_subjects(session)
         owned = Campaign(id="campaign-owned", tenant_id=TENANT_ID, owner_user_id=USER_ID, external_id="owned", name="Owned campaign")
         shared = Campaign(id="campaign-shared", tenant_id=TENANT_ID, owner_user_id=OTHER_USER_ID, external_id="shared", name="Shared campaign")
@@ -46,6 +47,7 @@ class CampaignAccessProviderTests(unittest.TestCase):
 
     def test_campaign_access_provider_requires_write_share_for_write_actions(self) -> None:
         session = _session()
+        self.addCleanup(_close_session, session)
         _seed_access_subjects(session)
         campaign = Campaign(id="campaign-write", tenant_id=TENANT_ID, owner_user_id=OTHER_USER_ID, external_id="write", name="Write campaign")
         session.add_all([
@@ -74,6 +76,12 @@ 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"),