Add docstring

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

Author: maxrjones

tests/test_store/test_local.py

@@ -56,6 +56,9 @@ def test_creates_new_directory(self, tmp_path: pathlib.Path):
         zarr.group(store=store)
 
     def test_invalid_root_raises(self):
+        """
+        Test that a TypeError is raised when a non-str/Path type is used for the `root` argument
+        """
         with pytest.raises(TypeError):
             LocalStore(root=0)