diff --git a/tests/test_store/test_stateful.py b/tests/test_store/test_stateful.py
index 462b463373..a17d7a55be 100644
--- a/tests/test_store/test_stateful.py
+++ b/tests/test_store/test_stateful.py
@@ -8,7 +8,6 @@
 from zarr.storage import LocalStore, ZipStore
 from zarr.testing.stateful import ZarrHierarchyStateMachine, ZarrStoreStateMachine
 
-
 pytestmark = [
     pytest.mark.slow_hypothesis,
     # TODO: work out where this warning is coming from and fix
@@ -16,7 +15,6 @@
 ]
 
 
-
 def test_zarr_hierarchy(sync_store: Store):
     def mk_test_instance_sync() -> ZarrHierarchyStateMachine:
         return ZarrHierarchyStateMachine(sync_store)