simpler

tests/test_readwrite.py

@@ -661,15 +661,9 @@ def random_cats(n):
 
 
 def test_write_string_type_error(tmp_path, diskfmt):
- adata = ad.AnnData(
- obs=pd.DataFrame(
- np.ones((3, 2)),
- columns=["a", np.str_("b")],
- index=["a", "b", "c"],
- ),
- )
-
+ adata = ad.AnnData(obs=dict(obs_names=list("abc")))
  adata.obs[b"c"] = np.zeros(3)
+
  # This should error, and tell you which key is at fault
  with pytest.raises(TypeError, match=r"writing key 'obs'") as exc_info:
  getattr(adata, f"write_{diskfmt}")(tmp_path / f"adata.{diskfmt}")
@@ -726,9 +720,6 @@ def roundtrip(diskfmt):
  return partial(_do_roundtrip, diskfmt=diskfmt)
 
 
-diskfmt2 = diskfmt
-
-
 def test_write_string_types(tmp_path, diskfmt, roundtrip):
  # https://github.com/scverse/anndata/issues/456
  adata_pth = tmp_path / f"adata.{diskfmt}"