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diff --git a/mailman/tests/test_passwords.py b/mailman/tests/test_passwords.py
new file mode 100644
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+++ b/mailman/tests/test_passwords.py
@@ -0,0 +1,161 @@
+# Copyright (C) 2007-2008 by the Free Software Foundation, Inc.
+#
+# This program 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 2
+# of the License, or (at your option) any later version.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+# USA.
+
+"""Unit tests for the passwords module."""
+
+import unittest
+
+from mailman import Errors
+from mailman import passwords
+
+
+
+class TestPasswordsBase(unittest.TestCase):
+    scheme = None
+
+    def setUp(self):
+        # passwords; 8-bit or unicode strings; ascii or binary
+        self.pw8a       = 'abc'
+        self.pwua       = u'abc'
+        self.pw8b       = 'abc\xc3\xbf'     # 'abc\xff'
+        self.pwub       = u'abc\xff'
+        # bad password; 8-bit or unicode; ascii or binary
+        self.bad8a      = 'xyz'
+        self.badua      = u'xyz'
+        self.bad8b      = 'xyz\xc3\xbf'     # 'xyz\xff'
+        self.badub      = u'xyz\xff'
+
+    def test_passwords(self):
+        unless = self.failUnless
+        failif = self.failIf
+        secret = passwords.make_secret(self.pw8a, self.scheme)
+        unless(passwords.check_response(secret, self.pw8a))
+        failif(passwords.check_response(secret, self.bad8a))
+
+    def test_unicode_passwords(self):
+        unless = self.failUnless
+        failif = self.failIf
+        secret = passwords.make_secret(self.pwua, self.scheme)
+        unless(passwords.check_response(secret, self.pwua))
+        failif(passwords.check_response(secret, self.badua))
+
+    def test_passwords_with_funky_chars(self):
+        unless = self.failUnless
+        failif = self.failIf
+        secret = passwords.make_secret(self.pw8b, self.scheme)
+        unless(passwords.check_response(secret, self.pw8b))
+        failif(passwords.check_response(secret, self.bad8b))
+
+    def test_unicode_passwords_with_funky_chars(self):
+        unless = self.failUnless
+        failif = self.failIf
+        secret = passwords.make_secret(self.pwub, self.scheme)
+        unless(passwords.check_response(secret, self.pwub))
+        failif(passwords.check_response(secret, self.badub))
+
+
+
+class TestBogusPasswords(TestPasswordsBase):
+    scheme = -1
+
+    def test_passwords(self):
+        self.assertRaises(Errors.BadPasswordSchemeError,
+                          passwords.make_secret, self.pw8a, self.scheme)
+
+    def test_unicode_passwords(self):
+        self.assertRaises(Errors.BadPasswordSchemeError,
+                          passwords.make_secret, self.pwua, self.scheme)
+
+    def test_passwords_with_funky_chars(self):
+        self.assertRaises(Errors.BadPasswordSchemeError,
+                          passwords.make_secret, self.pw8b, self.scheme)
+
+    def test_unicode_passwords_with_funky_chars(self):
+        self.assertRaises(Errors.BadPasswordSchemeError,
+                          passwords.make_secret, self.pwub, self.scheme)
+
+
+
+class TestNonePasswords(TestPasswordsBase):
+    scheme = passwords.Schemes.no_scheme
+
+    def test_passwords(self):
+        failif = self.failIf
+        secret = passwords.make_secret(self.pw8a, self.scheme)
+        failif(passwords.check_response(secret, self.pw8a))
+        failif(passwords.check_response(secret, self.bad8a))
+
+    def test_unicode_passwords(self):
+        failif = self.failIf
+        secret = passwords.make_secret(self.pwua, self.scheme)
+        failif(passwords.check_response(secret, self.pwua))
+        failif(passwords.check_response(secret, self.badua))
+
+    def test_passwords_with_funky_chars(self):
+        failif = self.failIf
+        secret = passwords.make_secret(self.pw8b, self.scheme)
+        failif(passwords.check_response(secret, self.pw8b))
+        failif(passwords.check_response(secret, self.bad8b))
+
+    def test_unicode_passwords_with_funky_chars(self):
+        failif = self.failIf
+        secret = passwords.make_secret(self.pwub, self.scheme)
+        failif(passwords.check_response(secret, self.pwub))
+        failif(passwords.check_response(secret, self.badub))
+
+
+
+class TestCleartextPasswords(TestPasswordsBase):
+    scheme = passwords.Schemes.cleartext
+
+
+class TestSHAPasswords(TestPasswordsBase):
+    scheme = passwords.Schemes.sha
+
+
+class TestSSHAPasswords(TestPasswordsBase):
+    scheme = passwords.Schemes.ssha
+
+
+class TestPBKDF2Passwords(TestPasswordsBase):
+    scheme = passwords.Schemes.pbkdf2
+
+
+
+class TestSchemeLookup(unittest.TestCase):
+    def test_scheme_name_lookup(self):
+        unless = self.failUnless
+        unless(passwords.lookup_scheme('NONE') is passwords.Schemes.no_scheme)
+        unless(passwords.lookup_scheme('CLEARTEXT') is
+               passwords.Schemes.cleartext)
+        unless(passwords.lookup_scheme('SHA') is passwords.Schemes.sha)
+        unless(passwords.lookup_scheme('SSHA') is passwords.Schemes.ssha)
+        unless(passwords.lookup_scheme('PBKDF2') is passwords.Schemes.pbkdf2)
+        unless(passwords.lookup_scheme(' -bogus- ') is None)
+
+
+
+def test_suite():
+    suite = unittest.TestSuite()
+    suite.addTest(unittest.makeSuite(TestBogusPasswords))
+    suite.addTest(unittest.makeSuite(TestNonePasswords))
+    suite.addTest(unittest.makeSuite(TestCleartextPasswords))
+    suite.addTest(unittest.makeSuite(TestSHAPasswords))
+    suite.addTest(unittest.makeSuite(TestSSHAPasswords))
+    suite.addTest(unittest.makeSuite(TestPBKDF2Passwords))
+    suite.addTest(unittest.makeSuite(TestSchemeLookup))
+    return suite