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diff --git a/src/mailman/rules/tests/test_no_senders.py b/src/mailman/rules/tests/test_no_senders.py
new file mode 100644
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+++ b/src/mailman/rules/tests/test_no_senders.py
@@ -0,0 +1,53 @@
+# 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 `no_subject` header rule."""
+
+import unittest
+
+from mailman.app.lifecycle import create_list
+from mailman.email.message import Message
+from mailman.rules import no_senders
+from mailman.testing.layers import ConfigLayer
+
+
+class TestNoSubject(unittest.TestCase):
+    """Test the no_senders rule."""
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self._mlist = create_list('test@example.com')
+        self._rule = no_senders.NoSenders()
+
+    def test_message_has_no_sender(self):
+        msg = Message()
+        msgdata = {}
+        result = self._rule.check(self._mlist, msg, msgdata)
+        self.assertTrue(result)
+        self.assertEqual(msgdata['moderation_action'], 'discard')
+        self.assertEqual(msgdata['moderation_reasons'],
+                         ['The message has no valid senders'])
+        self.assertEqual(msgdata['moderation_sender'], 'None')
+
+    def test_message_has_sender(self):
+        msg = Message()
+        msg['From'] = 'anne@example.com'
+        msgdata = {}
+        result = self._rule.check(self._mlist, msg, msgdata)
+        self.assertFalse(result)
+        self.assertEqual(msgdata, {})