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diff --git a/src/mailman/handlers/tests/test_cook_headers.py b/src/mailman/handlers/tests/test_cook_headers.py
new file mode 100644
index 000000000..1a8fa6cdc
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+++ b/src/mailman/handlers/tests/test_cook_headers.py
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+# Copyright (C) 2012-2014 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 cook_headers handler."""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'TestCookHeaders',
+    ]
+
+
+import unittest
+from email.mime.multipart import MIMEMultipart
+
+from mailman.app.lifecycle import create_list
+from mailman.handlers import cook_headers
+from mailman.testing.layers import ConfigLayer
+
+
+
+class TestCookHeaders(unittest.TestCase):
+    """Test the cook_headers handler."""
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self._mlist = create_list('test@example.com')
+
+    def test_process_multipart(self):
+        # The digest runner creates MIMEMultipart message instances which have
+        # no sender property.
+        msg = MIMEMultipart()
+        msg["message-id"] = "<test>"
+        try:
+            cook_headers.process(self._mlist, msg, {})
+        except AttributeError as e:
+            self.fail(e)