storetests store_kwargs defaults to not implemented

Author: d-v-b

src/zarr/testing/store.py

@@ -40,7 +40,7 @@ async def get(self, store: S, key: str) -> Buffer:
 
     @pytest.fixture
     def store_kwargs(self) -> dict[str, Any]:
-        return {"mode": "r+", "path": ""}
+        raise NotImplementedError
 
     @pytest.fixture
     async def store(self, store_kwargs: dict[str, Any]) -> Store: