From d1b48998e5b404387c8f0942197189ba3207c15e Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Mon, 28 Oct 2013 19:16:21 +0100
Subject: Issue #19421: add an unit test for warnings.warn() during
 finalization

---
 Lib/test/test_warnings.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

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 @@ class BootstrapTest(unittest.TestCase):
                 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()
-- 
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