fixup! fixup! fixup! fixup! fixup! fixup! fixup! Add tests for the fallback option

Author: pablogsal

Lib/test/test_sys.py

@@ -175,7 +175,8 @@ def test_excepthook_bytes_filename(self):
 
     def test_excepthook(self):
         with test.support.captured_output("stderr") as stderr:
-            sys.excepthook(1, '1', 1)
+            with test.support.catch_unraisable_exception():
+                sys.excepthook(1, '1', 1)
         self.assertTrue("TypeError: print_exception(): Exception expected for " \
                          "value, str found" in stderr.getvalue())
 

Lib/test/test_traceback.py

@@ -1360,12 +1360,15 @@ class TestTracebackFormat(unittest.TestCase, TracebackFormatMixin):
 class TestFallbackTracebackFormat(unittest.TestCase, TracebackFormatMixin):
     DEBUG_RANGES = False
     def setUp(self) -> None:
+        self.original_unraisable_hook = sys.unraisablehook
+        sys.unraisablehook = lambda *args: None
         self.original_hook = traceback._print_exception_bltin
         traceback._print_exception_bltin = lambda *args: 1/0
         return super().setUp()
 
     def tearDown(self) -> None:
         traceback._print_exception_bltin = self.original_hook
+        sys.unraisablehook = self.original_unraisable_hook
         return super().tearDown()
 
 class BaseExceptionReportingTests: