be more robust against the filters list changing under us (closes #24096)
diff --git a/Lib/test/test_warnings.py b/Lib/test/test_warnings.py
index 10076af..68bac36 100644
--- a/Lib/test/test_warnings.py
+++ b/Lib/test/test_warnings.py
@@ -185,6 +185,18 @@
self.assertEqual(str(w[-1].message), text)
self.assertTrue(w[-1].category is UserWarning)
+ def test_mutate_filter_list(self):
+ class X:
+ def match(self, a):
+ L[:] = []
+
+ L = [("default",X(),UserWarning,X(),0) for i in range(2)]
+ with original_warnings.catch_warnings(record=True,
+ module=self.module) as w:
+ self.module.filters = L
+ self.module.warn_explicit(UserWarning("b"), None, "f.py", 42)
+ self.assertEqual(str(w[-1].message), "b")
+
class CFilterTests(FilterTests, unittest.TestCase):
module = c_warnings