Update src/zarr/testing/store.py

Co-authored-by: Davis Bennett <[email protected]>

Author: maxrjones

src/zarr/testing/store.py

@@ -321,7 +321,7 @@ async def test_set_if_not_exists(self, store: S) -> None:
 
         with pytest.raises(Exception):
             new = self.buffer_cls.from_bytes(b"1111")
-            await store.set_if_not_exists("k", new)
+            await store.set_if_not_exists(key, new)
 
         result = await store.get(key, default_buffer_prototype())
         assert result == data_buf