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diff --git a/src/mailman/model/tests/test_usermanager.py b/src/mailman/model/tests/test_usermanager.py
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+++ b/src/mailman/model/tests/test_usermanager.py
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+# Copyright (C) 2015 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 IUserManager implementation."""
+
+__all__ = [
+    'TestUserManager',
+    ]
+
+
+import unittest
+
+from mailman.interfaces.address import ExistingAddressError
+from mailman.interfaces.usermanager import IUserManager
+from mailman.testing.layers import ConfigLayer
+from zope.component import getUtility
+
+
+class TestUserManager(unittest.TestCase):
+    layer = ConfigLayer
+
+    def test_create_user_with_existing_address(self):
+        # LP: #1418280.  If a user is created when an email address is passed
+        # in, and that address already exists, the user object should not get
+        # created.
+        manager = getUtility(IUserManager)
+        # Create the address we're going to try to duplicate.
+        manager.create_address('anne@example.com')
+        # There are no users.
+        self.assertEqual(len(list(manager.users)), 0)
+        # Now create the user with an already existing address.
+        with self.assertRaises(ExistingAddressError) as cm:
+            manager.create_user('anne@example.com')
+        self.assertEqual(cm.exception.address, 'anne@example.com')
+        # There are still no users.
+        self.assertEqual(len(list(manager.users)), 0)