Enhance error message normalization in ExpectedFailTest for improved …

…feedback clarity

hstest/testing/unittest/expected_fail_test.py

@@ -1,8 +1,10 @@
 from __future__ import annotations
 
 from inspect import cleandoc
+import re
+from typing import Any
 
-from hstest import StageTest
+from hstest.stage.stage_test import StageTest
 
 
 class ExpectedFailTest(StageTest):
@@ -15,6 +17,13 @@ class ExpectedFailTest(StageTest):
     def __init__(self, args) -> None:
         super().__init__(args)
 
+    def normalize_error_message(self, message: str) -> str:
+        # Remove error pointer markers added in Python 3.11+
+        message = re.sub(r'\s+[~^]+\s*', ' ', message)
+        # Normalize whitespace and line breaks
+        message = ' '.join(message.split())
+        return message
+
     def test_run_unittest(self) -> None:
         if not self.contain and not self.not_contain:
             self.fail("'contain' or 'not_contain' should not be empty")
@@ -35,8 +44,14 @@ def test_run_unittest(self) -> None:
         should_contain = self._base_contain + self.contain
         should_not_contain = self._base_not_contain + self.not_contain
 
+        normalized_feedback = self.normalize_error_message(feedback)
+
         for item in should_contain:
-            self.assertIn(cleandoc(item), feedback)
+            normalized_item = self.normalize_error_message(cleandoc(item))
+            self.assertIn(normalized_item, normalized_feedback,
+                         f"Expected to find:\n{normalized_item}\nin:\n{normalized_feedback}")
 
         for item in should_not_contain:
-            self.assertNotIn(cleandoc(item), feedback)
+            normalized_item = self.normalize_error_message(cleandoc(item))
+            self.assertNotIn(normalized_item, normalized_feedback,
+                           f"Expected NOT to find:\n{normalized_item}\nin:\n{normalized_feedback}")