Index: Lib/test/test_warnings.py
===================================================================
--- Lib/test/test_warnings.py	(revision 47065)
+++ Lib/test/test_warnings.py	(working copy)
@@ -81,6 +81,19 @@
         self.assertEqual(msg.message, text)
         self.assertEqual(msg.category, 'UserWarning')
 
+    def test_options(self):
+        # Uses the private _setoption() function to test the parsing
+        # of command-line warning arguments
+        self.assertRaises(warnings._OptionError,
+                          warnings._setoption, '1:2:3:4:5:6')
+        self.assertRaises(warnings._OptionError,
+                          warnings._setoption, 'bogus::Warning')
+        self.assertRaises(warnings._OptionError,
+                          warnings._setoption, 'ignore:2::4:-5')
+        warnings._setoption('error::Warning::0')
+        self.assertRaises(UserWarning, warnings.warn, 'convert to error')
+        
+
 def test_main(verbose=None):
     # Obscure hack so that this test passes after reloads or repeated calls
     # to test_main (regrtest -R).