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diff --git a/src/mailman/runners/tests/test_nntp.py b/src/mailman/runners/tests/test_nntp.py
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+# 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 NNTP runner and related utilities."""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'TestNNTP',
+    ]
+
+
+import unittest
+
+from mailman.app.lifecycle import create_list
+from mailman.interfaces.nntp import NewsModeration
+from mailman.runners import nntp
+from mailman.testing.helpers import (
+    specialized_message_from_string as mfs)
+from mailman.testing.layers import ConfigLayer
+
+
+
+class TestNNTP(unittest.TestCase):
+    """Test the NNTP runner and related utilities."""
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self._mlist = create_list('test@example.com')
+        self._msg = mfs("""\
+From: anne@example.com
+To: test@example.com
+Subject: A newsgroup posting
+Message-ID: <ant>
+
+Testing
+""")
+
+    def test_moderated_approved_header(self):
+        # When the mailing list is moderated , the message will get an
+        # Approved header, which NNTP software uses to forward to the
+        # newsgroup.  The message would not have gotten to the mailing list if
+        # it wasn't already approved.
+        self._mlist.news_moderation = NewsModeration.moderated
+        nntp.prepare_message(self._mlist, self._msg, {})
+        self.assertEqual(self._msg['approved'], 'test@example.com')
+
+    def test_open_moderated_approved_header(self):
+        # When the mailing list is moderated using an open posting policy, the
+        # message will get an Approved header, which NNTP software uses to
+        # forward to the newsgroup.  The message would not have gotten to the
+        # mailing list if it wasn't already approved.
+        self._mlist.news_moderation = NewsModeration.open_moderated
+        nntp.prepare_message(self._mlist, self._msg, {})
+        self.assertEqual(self._msg['approved'], 'test@example.com')
+
+    def test_moderation_removes_previous_approved_header(self):
+        # Any existing Approved header is removed from moderated messages.
+        self._msg['Approved'] = 'a bogus approval'
+        self._mlist.news_moderation = NewsModeration.moderated
+        nntp.prepare_message(self._mlist, self._msg, {})
+        headers = self._msg.get_all('approved')
+        self.assertEqual(len(headers), 1)
+        self.assertEqual(headers[0], 'test@example.com')
+
+    def test_open_moderation_removes_previous_approved_header(self):
+        # Any existing Approved header is removed from moderated messages.
+        self._msg['Approved'] = 'a bogus approval'
+        self._mlist.news_moderation = NewsModeration.open_moderated
+        nntp.prepare_message(self._mlist, self._msg, {})
+        headers = self._msg.get_all('approved')
+        self.assertEqual(len(headers), 1)
+        self.assertEqual(headers[0], 'test@example.com')
+
+    def test_stripped_subject(self):
+        # The cook-headers handler adds the original and/or stripped (of the
+        # prefix) subject to the metadata.  Assume that handler's been run;
+        # check the Subject header.
+        self._mlist.news_prefix_subject_too = False
+        del self._msg['subject']
+        self._msg['subject'] = 'Re: Your test'
+        msgdata = dict(stripped_subject='Your test')
+        nntp.prepare_message(self._mlist, self._msg, msgdata)
+        headers = self._msg.get_all('subject')
+        self.assertEqual(len(headers), 1)
+        self.assertEqual(headers[0], 'Your test')
+
+    def test_original_subject(self):
+        # The cook-headers handler adds the original and/or stripped (of the
+        # prefix) subject to the metadata.  Assume that handler's been run;
+        # check the Subject header.
+        self._mlist.news_prefix_subject_too = False
+        del self._msg['subject']
+        self._msg['subject'] = 'Re: Your test'
+        msgdata = dict(original_subject='Your test')
+        nntp.prepare_message(self._mlist, self._msg, msgdata)
+        headers = self._msg.get_all('subject')
+        self.assertEqual(len(headers), 1)
+        self.assertEqual(headers[0], 'Your test')
+
+    def test_stripped_subject_prefix_okay(self):
+        # The cook-headers handler adds the original and/or stripped (of the
+        # prefix) subject to the metadata.  Assume that handler's been run;
+        # check the Subject header.
+        self._mlist.news_prefix_subject_too = True
+        del self._msg['subject']
+        self._msg['subject'] = 'Re: Your test'
+        msgdata = dict(stripped_subject='Your test')
+        nntp.prepare_message(self._mlist, self._msg, msgdata)
+        headers = self._msg.get_all('subject')
+        self.assertEqual(len(headers), 1)
+        self.assertEqual(headers[0], 'Re: Your test')
+
+    def test_original_subject_prefix_okay(self):
+        # The cook-headers handler adds the original and/or stripped (of the
+        # prefix) subject to the metadata.  Assume that handler's been run;
+        # check the Subject header.
+        self._mlist.news_prefix_subject_too = True
+        del self._msg['subject']
+        self._msg['subject'] = 'Re: Your test'
+        msgdata = dict(original_subject='Your test')
+        nntp.prepare_message(self._mlist, self._msg, msgdata)
+        headers = self._msg.get_all('subject')
+        self.assertEqual(len(headers), 1)
+        self.assertEqual(headers[0], 'Re: Your test')