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diff --git a/src/mailman/rules/tests/test_news_moderation.py b/src/mailman/rules/tests/test_news_moderation.py
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+++ b/src/mailman/rules/tests/test_news_moderation.py
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+# Copyright (C) 2016-2017 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 `news_moderation` rule."""
+
+import unittest
+
+from mailman.app.lifecycle import create_list
+from mailman.interfaces.nntp import NewsgroupModeration
+from mailman.rules import news_moderation
+from mailman.testing.helpers import specialized_message_from_string as mfs
+from mailman.testing.layers import ConfigLayer
+
+
+class TestModeratedNewsgroup(unittest.TestCase):
+    """Test the news_moderation rule."""
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self._mlist = create_list('test@example.com')
+
+    def test_news_moderation_returns_reason(self):
+        # Ensure news_moderation rule returns a reason.
+        msg = mfs("""\
+From: anne@example.com
+To: test@example.com
+Subject: A Subject
+Message-ID: <ant>
+
+A message body.
+""")
+        rule = news_moderation.ModeratedNewsgroup()
+        self._mlist.newsgroup_moderation = NewsgroupModeration.moderated
+        msgdata = {}
+        result = rule.check(self._mlist, msg, msgdata)
+        self.assertTrue(result)
+        self.assertEqual(msgdata['moderation_reasons'],
+                         ['Post to a moderated newsgroup gateway'])