diff --git a/tests/test_backed_sparse.py b/tests/test_backed_sparse.py
index 125b0e829..64f80cc90 100644
--- a/tests/test_backed_sparse.py
+++ b/tests/test_backed_sparse.py
@@ -47,6 +47,7 @@ def diskfmt(request):
 zarr_metadata_key = ".zarray" if is_zarr_v2() else "zarr.json"
 zarr_separator = "" if is_zarr_v2() else "/c"
 
+
 @pytest.fixture
 def ondisk_equivalent_adata(
     tmp_path: Path, diskfmt: Literal["h5ad", "zarr"]
diff --git a/tests/test_io_dispatched.py b/tests/test_io_dispatched.py
index b11e01963..98d1a04a8 100644
--- a/tests/test_io_dispatched.py
+++ b/tests/test_io_dispatched.py
@@ -8,7 +8,7 @@
 
 import anndata as ad
 from anndata._io.zarr import open_write_group
-from anndata.compat import SpArray, is_zarr_v2, ZarrGroup
+from anndata.compat import SpArray, ZarrGroup, is_zarr_v2
 from anndata.experimental import read_dispatched, write_dispatched
 from anndata.tests.helpers import assert_equal, gen_adata
 
@@ -163,7 +163,7 @@ def h5ad_writer(func, store, k, elem, dataset_kwargs, iospec):
         func(store, k, elem, dataset_kwargs=dataset_kwargs)
 
     def zarr_writer(func, store, k, elem, dataset_kwargs, iospec):
-        zarr_write_keys.append(f"{store.name.strip("/")}/{k.strip("/")}".strip("/"))
+        zarr_write_keys.append(f"{store.name.strip('/')}/{k.strip('/')}".strip("/"))
         func(store, k, elem, dataset_kwargs=dataset_kwargs)
 
     def h5ad_reader(func, elem_name: str, elem, iospec):