[3.13] gh-130250: fix cleanup in test (impacts refleaks runs) (GH-130329) (#130330)

gh-130250: fix cleanup in test (impacts refleaks runs) (GH-130329)
(cherry picked from commit c718c6be0f82af5eb0e57615ce323242155ff014)

Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>

diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index 5d24f6850d01e1bbba23de2887778ccf2bfb8871..321ee2294b9f7075193958ed0c461241724514a4 100644 (file)
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -518,10 +518,13 @@ class TracebackCases(unittest.TestCase):
 
     def test_print_last(self):
         self.assertIsNone(getattr(sys, "last_exc", None))
-        sys.last_exc = ValueError(42)
-        output = StringIO()
-        traceback.print_last(file=output)
-        self.assertEqual(output.getvalue(), "ValueError: 42\n")
+        try:
+            sys.last_exc = ValueError(42)
+            output = StringIO()
+            traceback.print_last(file=output)
+            self.assertEqual(output.getvalue(), "ValueError: 42\n")
+        finally:
+            sys.last_exc = None
 
     def test_format_exception_exc(self):
         e = Exception("projector")