diff -r de81e0fe4905 Lib/test/test_email/test_policy.py
--- a/Lib/test/test_email/test_policy.py	Sun Mar 02 20:29:18 2014 +0100
+++ b/Lib/test/test_email/test_policy.py	Sat Mar 08 14:39:09 2014 +0100
@@ -83,6 +83,12 @@
         for method in abstract_methods:
             self.assertIn(method, msg)
 
+    def test_header_store_parse_validation(self):
+        instance = email.policy.EmailPolicy()
+        self.assertRaises(ValueError,
+                          instance.header_store_parse,
+                          'From', 'spam\negg@foo.py')
+
     def test_policy_is_immutable(self):
         for policy, defaults in self.policies.items():
             for attr in defaults: