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diff --git a/src/mailman/pipeline/tests/test_scrubber.py b/src/mailman/pipeline/tests/test_scrubber.py
new file mode 100644
index 000000000..7ac5eb855
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+++ b/src/mailman/pipeline/tests/test_scrubber.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/>.
+
+"""Scrubber module tests."""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'TestScrubber',
+    ]
+
+
+import unittest
+
+from mailman.pipeline import scrubber
+
+
+
+class TestScrubber(unittest.TestCase):
+    """Scrubber module tests."""
+
+    def test_guess_extension(self):
+        # A known extension should be found.
+        extension = scrubber.guess_extension('application/msword', '.doc')
+        self.assertEqual(extension, '.doc')
+
+    def test_guess_missing_extension(self):
+        # Maybe some other extension is better.
+        extension = scrubber.guess_extension('application/msword', '.xxx')
+        self.assertEqual(extension, '.doc')