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diff --git a/src/mailman/handlers/tests/test_subject_prefix.py b/src/mailman/handlers/tests/test_subject_prefix.py
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+++ b/src/mailman/handlers/tests/test_subject_prefix.py
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+# Copyright (C) 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 Subject header prefix munging.."""
+
+__all__ = [
+    'TestSubjectPrefix',
+    ]
+
+
+import unittest
+
+from mailman.app.lifecycle import create_list
+from mailman.config import config
+from mailman.email.message import Message
+from mailman.testing.layers import ConfigLayer
+
+
+
+class TestSubjectPrefix(unittest.TestCase):
+    layer = ConfigLayer
+
+    def setUp(self):
+        self._mlist = create_list('test@example.com')
+        self._process = config.handlers['subject-prefix'].process
+
+    def test_isdigest(self):
+        # If the message is destined for the digest, the Subject header does
+        # not get touched.
+        msg = Message()
+        msg['Subject'] = 'A test message'
+        self._process(self._mlist, msg, dict(isdigest=True))
+        self.assertEqual(str(msg['subject']), 'A test message')
+
+    def test_fasttrack(self):
+        # Messages internally crafted are 'fast tracked' and don't get their
+        # Subjects prefixed either.
+        msg = Message()
+        msg['Subject'] = 'A test message'
+        self._process(self._mlist, msg, dict(_fasttrack=True))
+        self.assertEqual(str(msg['subject']), 'A test message')
+
+    def test_whitespace_only_prefix(self):
+        # If the Subject prefix only contains whitespace, ignore it.
+        self._mlist.subject_prefix = '    '
+        msg = Message()
+        msg['Subject'] = 'A test message'
+        self._process(self._mlist, msg, dict(_fasttrack=True))
+        self.assertEqual(str(msg['subject']), 'A test message')
+
+    def test_save_original_subject(self):
+        # When the Subject gets prefixed, the original is saved in the message
+        # metadata.
+        msgdata = {}
+        msg = Message()
+        msg['Subject'] = 'A test message'
+        self._process(self._mlist, msg, msgdata)
+        self.assertEqual(msgdata['original_subject'], 'A test message')
+
+    def test_prefix(self):
+        # The Subject gets prefixed.  The prefix gets automatically set by the
+        # list style when the list gets created.
+        msg = Message()
+        msg['Subject'] = 'A test message'
+        self._process(self._mlist, msg, {})
+        self.assertEqual(str(msg['subject']), '[Test] A test message')
+
+    def test_no_double_prefix(self):
+        # Don't add a prefix if the subject already contains one.
+        msg = Message()
+        msg['Subject'] = '[Test] A test message'
+        self._process(self._mlist, msg, {})
+        self.assertEqual(str(msg['subject']), '[Test] A test message')
+
+    def test_re_prefix(self):
+        # The subject has a Re: prefix.  Make sure that gets preserved, but
+        # after the list prefix.
+        msg = Message()
+        msg['Subject'] = 'Re: [Test] A test message'
+        self._process(self._mlist, msg, {})
+        self.assertEqual(str(msg['subject']), '[Test] Re: A test message')
+
+    def test_multiline_subject(self):
+        # The subject appears on multiple lines.
+        msg = Message()
+        msg['Subject'] = '\n A test message'
+        self._process(self._mlist, msg, {})
+        self.assertEqual(str(msg['subject']), '[Test]  A test message')
+
+    def test_i18n_prefix(self):
+        # The Subject header is encoded, but the prefix is still added.
+        msg = Message()
+        msg['Subject'] = '=?iso-2022-jp?b?GyRCJWEhPCVrJV4lcxsoQg==?='
+        self._process(self._mlist, msg, {})
+        subject = msg['subject']
+        self.assertEqual(subject.encode(),
+                         '[Test] =?iso-2022-jp?b?GyRCJWEhPCVrJV4lcxsoQg==?=')
+        self.assertEqual(str(subject), '[Test] メールマン')
+
+    def test_i18n_subject_with_sequential_prefix_and_re(self):
+        # The mailing list defines a sequential prefix, and the original
+        # Subject has a prefix with a different sequence number, *and* it also
+        # contains a Re: prefix.  Make sure the sequence gets updated and all
+        # the bits get put back together in the right order.
+        self._mlist.subject_prefix = '[Test %d]'
+        self._mlist.post_id = 456
+        msg = Message()
+        msg['Subject'] = \
+          '[Test 123] Re: =?iso-2022-jp?b?GyRCJWEhPCVrJV4lcxsoQg==?='
+        self._process(self._mlist, msg, {})
+        subject = msg['subject']
+        self.assertEqual(
+            subject.encode(),
+            '[Test 456] Re: =?iso-2022-jp?b?GyRCJWEhPCVrJV4lcxsoQg==?=')
+        self.assertEqual(str(subject), '[Test 456] Re: メールマン')