Issue #19421: add an unit test for warnings.warn() during finalization
diff --git a/Lib/test/test_warnings.py b/Lib/test/test_warnings.py
index 464ff40..3c54c5a 100644
--- a/Lib/test/test_warnings.py
+++ b/Lib/test/test_warnings.py
@@ -788,6 +788,25 @@
env=env)
self.assertEqual(retcode, 0)
+class FinalizationTest(unittest.TestCase):
+ def test_finalization(self):
+ # Issue #19421: warnings.warn() should not crash
+ # during Python finalization
+ code = """
+import warnings
+warn = warnings.warn
+
+class A:
+ def __del__(self):
+ warn("test")
+
+a=A()
+ """
+ rc, out, err = assert_python_ok("-c", code)
+ # note: "__main__" filename is not correct, it should be the name
+ # of the script
+ self.assertEqual(err, b'__main__:7: UserWarning: test')
+
def setUpModule():
py_warnings.onceregistry.clear()