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diff --git a/src/mailman/email/tests/test_message.py b/src/mailman/email/tests/test_message.py
new file mode 100644
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+++ b/src/mailman/email/tests/test_message.py
@@ -0,0 +1,60 @@
+# Copyright (C) 2012 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Test the message API."""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'TestMessage',
+    ]
+
+
+import unittest
+
+from mailman.app.lifecycle import create_list
+from mailman.email.message import UserNotification
+from mailman.testing.helpers import get_queue_messages
+from mailman.testing.layers import ConfigLayer
+
+
+
+class TestMessage(unittest.TestCase):
+    """Test the message API."""
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self._mlist = create_list('test@example.com')
+        self._msg = UserNotification(
+            'aperson@example.com',
+            'test@example.com',
+            'Something you need to know',
+            'I needed to tell you this.')
+
+    def test_one_precedence_header(self):
+        # Ensure that when the original message already has a Precedence:
+        # header, UserNotification.send(..., add_precedence=True, ...) does
+        # not add a second header.
+        self.assertEqual(self._msg['precedence'], None)
+        self._msg['Precedence'] = 'omg wtf bbq'
+        self._msg.send(self._mlist)
+        messages = get_queue_messages('virgin')
+        self.assertEqual(len(messages), 1)
+        self.assertEqual(messages[0].msg.get_all('precedence'), 
+                         ['omg wtf bbq'])