Replace catch_warnings with check_warnings when it makes sense.  Use assertRaises context manager to simplify some tests.
diff --git a/Lib/test/test_sundry.py b/Lib/test/test_sundry.py
index cef155b..3aade6d 100644
--- a/Lib/test/test_sundry.py
+++ b/Lib/test/test_sundry.py
@@ -3,13 +3,11 @@
 from test import test_support
 import sys
 import unittest
-import warnings
 
 
 class TestUntestedModules(unittest.TestCase):
     def test_at_least_import_untested_modules(self):
-        with warnings.catch_warnings():
-            warnings.simplefilter("ignore")
+        with test_support.check_warnings(quiet=True):
             import CGIHTTPServer
             import audiodev
             import bdb