Test list parsing key-display whitespace normalization

Co-authored-by: Shri Sukhani <shrisukhani@users.noreply.github.com>

Author: cursoragent

tests/test_list_parsing_utils.py

@@ -144,6 +144,19 @@ def test_parse_mapping_list_items_falls_back_when_key_display_returns_blank_stri
         )
 
 
+def test_parse_mapping_list_items_strips_surrounding_whitespace_in_key_display():
+    with pytest.raises(
+        HyperbrowserError,
+        match="Failed to read demo object value for key 'field' at index 0",
+    ):
+        parse_mapping_list_items(
+            [_ExplodingValueMapping()],
+            item_label="demo",
+            parse_item=lambda payload: payload,
+            key_display=lambda key: f"  {key}  ",
+        )
+
+
 def test_parse_mapping_list_items_falls_back_when_key_display_returns_control_chars():
     with pytest.raises(
         HyperbrowserError,