Clean Access audit and test resources

tests/test_admin_batch_helpers.py

@@ -22,12 +22,15 @@ class AdminBatchHelperTests(unittest.TestCase):
         self.engine = create_engine("sqlite:///:memory:")
         Base.metadata.create_all(bind=self.engine)
         self.Session = sessionmaker(bind=self.engine)
+        self.session = self.Session()
 
     def tearDown(self) -> None:
+        self.session.close()
         Base.metadata.drop_all(bind=self.engine)
+        self.engine.dispose()
 
     def test_access_admin_batch_maps_related_rows(self) -> None:
-        session = self.Session()
+        session = self.session
         account = Account(id="account-1", email="ada@example.test", normalized_email="ada@example.test")
         user = User(id="user-1", tenant_id="tenant-1", account_id=account.id, email=account.email)
         group = Group(id="group-1", tenant_id="tenant-1", slug="clerks", name="Clerks")