Issue #12467: warnings: fix a race condition if a warning is emitted at
shutdown, if globals()['__file__'] is None.
diff --git a/Lib/test/test_warnings.py b/Lib/test/test_warnings.py
index dbf30e9..79be835 100644
--- a/Lib/test/test_warnings.py
+++ b/Lib/test/test_warnings.py
@@ -542,6 +542,18 @@
assert expected_line
self.assertEqual(second_line, expected_line)
+ def test_filename_none(self):
+ # issue #12467: race condition if a warning is emitted at shutdown
+ globals_dict = globals()
+ oldfile = globals_dict['__file__']
+ try:
+ with original_warnings.catch_warnings(module=self.module) as w:
+ self.module.filterwarnings("always", category=UserWarning)
+ globals_dict['__file__'] = None
+ original_warnings.warn('test', UserWarning)
+ finally:
+ globals_dict['__file__'] = oldfile
+
class WarningsDisplayTests(unittest.TestCase):