Fix failing tests when traceback timestamps are enabled

Update test_wsgiref, test_pdb, and test_remote_pdb to handle timestamp
suffixes in exception messages when PYTHON_TRACEBACK_TIMESTAMPS is set.

- test_wsgiref: Use traceback.strip_exc_timestamps() before comparing
  error messages in validation tests
- test_pdb: Update doctest expected output to use ellipsis for timestamp
  matching in await support test
- test_remote_pdb: Strip timestamps from stdout before comparison in
  do_test method

All tests now pass both with and without timestamp functionality enabled.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: gpshead

Lib/test/test_pdb.py

@@ -2200,7 +2200,7 @@ def test_pdb_await_support():
             > <doctest test.test_pdb.test_pdb_await_support[2]>(4)main()
             -> await pdb.Pdb(nosigint=True, readrc=False).set_trace_async()
             (Pdb) await non_exist()
-            *** NameError: name 'non_exist' is not defined
+            *** NameError: name 'non_exist' is not defined...
             > <doctest test.test_pdb.test_pdb_await_support[2]>(4)main()
             -> await pdb.Pdb(nosigint=True, readrc=False).set_trace_async()
             (Pdb) s

Lib/test/test_remote_pdb.py

@@ -11,6 +11,7 @@
 import tempfile
 import textwrap
 import threading
+import traceback
 import unittest
 import unittest.mock
 from contextlib import closing, contextmanager, redirect_stdout, redirect_stderr, ExitStack
@@ -207,9 +208,9 @@ def sigint_stdout_write(s):
         self.assertEqual(actual_outgoing, expected_outgoing)
         self.assertEqual(completions, expected_completions)
         if expected_stdout_substring and not expected_stdout:
-            self.assertIn(expected_stdout_substring, stdout.getvalue())
+            self.assertIn(expected_stdout_substring, traceback.strip_exc_timestamps(stdout.getvalue()))
         else:
-            self.assertEqual(stdout.getvalue(), expected_stdout)
+            self.assertEqual(traceback.strip_exc_timestamps(stdout.getvalue()), expected_stdout)
         input_mock.assert_has_calls([unittest.mock.call(p) for p in prompts])
         actual_state = {k: getattr(client, k) for k in expected_state}
         self.assertEqual(actual_state, expected_state)

Lib/test/test_wsgiref.py

@@ -18,6 +18,7 @@
 import os
 import re
 import signal
+import traceback
 import sys
 import threading
 import unittest
@@ -153,7 +154,7 @@ def bad_app(environ,start_response):
             b"A server error occurred.  Please contact the administrator."
         )
         self.assertEqual(
-            err.splitlines()[-2],
+            traceback.strip_exc_timestamps(err).splitlines()[-2],
             "AssertionError: Headers (('Content-Type', 'text/plain')) must"
             " be of type list: <class 'tuple'>"
         )
@@ -177,7 +178,7 @@ def bad_app(environ, start_response):
                 self.assertEndsWith(out,
                     b"A server error occurred.  Please contact the administrator."
                 )
-                self.assertEqual(err.splitlines()[-2], exc_message)
+                self.assertEqual(traceback.strip_exc_timestamps(err).splitlines()[-2], exc_message)
 
     def test_wsgi_input(self):
         def bad_app(e,s):
@@ -189,7 +190,7 @@ def bad_app(e,s):
             b"A server error occurred.  Please contact the administrator."
         )
         self.assertEqual(
-            err.splitlines()[-2], "AssertionError"
+            traceback.strip_exc_timestamps(err).splitlines()[-2], "AssertionError"
         )
 
     def test_bytes_validation(self):