test case sensitivity

tests/ngff/test_ngff.py

@@ -16,6 +16,7 @@
 from numpy.typing import NDArray
 from ome_zarr.io import parse_url
 from ome_zarr.reader import Reader
+from zarr.errors import ContainsGroupError
 
 if TYPE_CHECKING:
     from _typeshed import StrPath
@@ -630,7 +631,6 @@ def test_modify_hcs_ref(row: str, col: str, pos: str):
             new_pos.create_zeros("0", position[0].shape, position[0].dtype)
             assert not dataset[f"{new_pos_path}/0"][:].any()
 
-
 @given(row_names=plate_axis_names_st, col_names=plate_axis_names_st)
 @settings(max_examples=16, deadline=2000)
 def test_create_well(row_names: list[str], col_names: list[str]):
@@ -667,6 +667,20 @@ def test_create_position(row, col, pos):
         assert os.path.isdir(os.path.join(store_path, row, col, pos))
         assert dataset[row][col].metadata.images[0].path == pos
 
+def test_create_position_case_sensitivity(row, col, pos):
+    """Test `iohub.ngff.Plate.create_position()`"""
+    with TemporaryDirectory() as temp_dir:
+        store_path = os.path.join(temp_dir, "hcs.zarr")
+        dataset = open_ome_zarr(
+            store_path, layout="hcs", mode="a", channel_names=["GFP"]
+        )
+        dataset.create_position("S", "0", "1")
+        dataset.create_position("s", "1", "0")
+
+        with pytest.raises(ContainsGroupError):
+            dataset.create_position("S", "1", "0")
+
+
 
 @given(channels_and_random_5d=_channels_and_random_5d())
 def test_position_scale(channels_and_random_5d):