gh-117606: Truncate extremely long error message in `test_exceptions` (#117670)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 36fd89dbb8896cc7c308ab17347211271e08819f..1224f143b5441f7de871525536f97c605ab6e64d 100644 (file)
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -1451,7 +1451,8 @@ class ExceptionTests(unittest.TestCase):
         """
         rc, out, err = script_helper.assert_python_failure("-c", code)
         self.assertEqual(rc, 1)
-        self.assertIn(b'RecursionError: maximum recursion depth exceeded', err)
+        expected = b'RecursionError: maximum recursion depth exceeded'
+        self.assertTrue(expected in err, msg=f"{expected!r} not found in {err[:3_000]!r}... (truncated)")
         self.assertIn(b'Done.', out)