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diff --git a/src/mailman/utilities/tests/test_passwords.py b/src/mailman/utilities/tests/test_passwords.py
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+++ b/src/mailman/utilities/tests/test_passwords.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/>.
+
+"""Testing the password utility."""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'TestPasswords',
+    ]
+
+
+import os
+import unittest
+
+from mailman.config import config
+from mailman.testing.helpers import configuration
+from mailman.testing.layers import ConfigLayer
+
+
+
+class TestPasswords(unittest.TestCase):
+    layer = ConfigLayer
+
+    def test_default_passlib(self):
+        # By default, testing uses the roundup_plaintext hash algorithm, which
+        # is just plaintext with a prefix.
+        self.assertEqual(config.password_context.encrypt('my password'),
+                         '{plaintext}my password')
+
+    def test_passlib_from_file_path(self):
+        # Set up this test to use a passlib configuration file specified with
+        # a file system path.  We prove we're using the new configuration
+        # because a non-prefixed, i.e. non-roundup, plaintext hash algorithm
+        # will be used.  When a file system path is used, the file can end in
+        # any suffix.
+        config_file = os.path.join(config.VAR_DIR, 'passlib.config')
+        with open(config_file, 'w') as fp:
+            print("""\
+[passlib]
+schemes = plaintext
+""", file=fp)
+        with configuration('passwords', path=config_file):
+            self.assertEqual(config.password_context.encrypt('my password'),
+                             'my password')