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diff --git a/src/mailman/mta/tests/test_aliases.py b/src/mailman/mta/tests/test_aliases.py
new file mode 100644
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+++ b/src/mailman/mta/tests/test_aliases.py
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+# Copyright (C) 2011 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 template generating utility."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'test_suite',
+    ]
+
+
+import unittest
+
+from cStringIO import StringIO
+from zope.component import getUtility
+
+from mailman.app.lifecycle import create_list
+from mailman.config import config
+from mailman.interfaces.mta import IMailTransportAgentAliases
+from mailman.mta.postfix import LMTP
+from mailman.testing.layers import ConfigLayer
+
+NL = '\n'
+
+
+
+class TestAliases(unittest.TestCase):
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self.utility = getUtility(IMailTransportAgentAliases)
+        self.mlist = create_list('test@example.com')
+
+    def test_posting_address_first(self):
+        # The posting address is always first.
+        aliases = list(self.utility.aliases(self.mlist))
+        self.assertEqual(aliases[0], self.mlist.posting_address)
+
+    def test_aliases(self):
+        # The aliases are the fully qualified email addresses.
+        aliases = list(self.utility.aliases(self.mlist))
+        self.assertEqual(aliases, [
+            'test@example.com',
+            'test-bounces@example.com',
+            'test-confirm@example.com',
+            'test-join@example.com',
+            'test-leave@example.com',
+            'test-owner@example.com',
+            'test-request@example.com',
+            'test-subscribe@example.com',
+            'test-unsubscribe@example.com',
+            ])
+
+    def test_destinations(self):
+        # The destinations are just the local part.
+        destinations = list(self.utility.destinations(self.mlist))
+        self.assertEqual(destinations, [
+            'test',
+            'test-bounces',
+            'test-confirm',
+            'test-join',
+            'test-leave',
+            'test-owner',
+            'test-request',
+            'test-subscribe',
+            'test-unsubscribe',
+            ])
+
+
+
+class TestPostfix(unittest.TestCase):
+    """Test the Postfix LMTP alias generator."""
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self.utility = getUtility(IMailTransportAgentAliases)
+        self.mlist = create_list('test@example.com')
+        self.output = StringIO()
+        self.postfix = LMTP()
+        # For Python 2.7's unittest.
+        self.maxDiff = None
+
+    def test_aliases(self):
+        # Test the format of the Postfix alias generator.
+        self.postfix.regenerate(self.output)
+        # Python 2.7 has assertMultiLineEqual but Python 2.6 does not.
+        eq = getattr(self, 'assertMultiLineEqual', self.assertEqual)
+        # Strip out the variable and unimportant bits of the output.
+        lines = self.output.getvalue().splitlines()
+        output = NL.join(lines[7:])
+        eq(output, """\
+# Aliases which are visible only in the @example.com domain.
+test@example.com               lmtp:[127.0.0.1]:9024
+test-bounces@example.com       lmtp:[127.0.0.1]:9024
+test-confirm@example.com       lmtp:[127.0.0.1]:9024
+test-join@example.com          lmtp:[127.0.0.1]:9024
+test-leave@example.com         lmtp:[127.0.0.1]:9024
+test-owner@example.com         lmtp:[127.0.0.1]:9024
+test-request@example.com       lmtp:[127.0.0.1]:9024
+test-subscribe@example.com     lmtp:[127.0.0.1]:9024
+test-unsubscribe@example.com   lmtp:[127.0.0.1]:9024
+""")
+
+
+
+def test_suite():
+    suite = unittest.TestSuite()
+    suite.addTest(unittest.makeSuite(TestAliases))
+    suite.addTest(unittest.makeSuite(TestPostfix))
+    return suite