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diff --git a/src/mailman/tests/test_documentation.py b/src/mailman/tests/test_documentation.py
new file mode 100644
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+++ b/src/mailman/tests/test_documentation.py
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+# Copyright (C) 2007-2009 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/>.
+
+"""Harness for testing Mailman's documentation.
+
+Note that doctest extraction does not currently work for zip file
+distributions.  doctest discovery currently requires file system traversal.
+"""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'test_suite',
+    ]
+
+
+import os
+import random
+import doctest
+import unittest
+
+from email import message_from_string
+
+import mailman
+
+from mailman.Message import Message
+from mailman.config import config
+from mailman.testing.layers import SMTPLayer
+
+
+DOT = '.'
+COMMASPACE = ', '
+
+
+
+class chdir:
+    """A context manager for temporary directory changing."""
+    def __init__(self, directory):
+        self._curdir = None
+        self._directory = directory
+
+    def __enter__(self):
+        self._curdir = os.getcwd()
+        os.chdir(self._directory)
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        os.chdir(self._curdir)
+        # Don't suppress exceptions.
+        return False
+
+
+
+def specialized_message_from_string(text):
+    """Parse text into a message object.
+
+    This is specialized in the sense that an instance of Mailman's own Message
+    object is returned, and this message object has an attribute
+    `original_size` which is the pre-calculated size in bytes of the message's
+    text representation.
+    """
+    # This mimic what Switchboard.dequeue() does when parsing a message from
+    # text into a Message instance.
+    original_size = len(text)
+    message = message_from_string(text, Message)
+    message.original_size = original_size
+    return message
+
+
+def stop():
+    """Call into pdb.set_trace()"""
+    # Do the import here so that you get the wacky special hacked pdb instead
+    # of Python's normal pdb.
+    import pdb
+    pdb.set_trace()
+
+
+def dump_msgdata(msgdata, *additional_skips):
+    """Dump in a more readable way a message metadata dictionary."""
+    skips = set(additional_skips)
+    # Some stuff we always want to skip, because their values will always be
+    # variable data.
+    skips.add('received_time')
+    longest = max(len(key) for key in msgdata if key not in skips)
+    for key in sorted(msgdata):
+        if key in skips:
+            continue
+        print '{0:{2}}: {1}'.format(key, msgdata[key], longest)
+
+
+def setup(testobj):
+    """Test setup."""
+    # In general, I don't like adding convenience functions, since I think
+    # doctests should do the imports themselves.  It makes for better
+    # documentation that way.  However, a few are really useful, or help to
+    # hide some icky test implementation details.
+    testobj.globs['commit'] = config.db.commit
+    testobj.globs['config'] = config
+    testobj.globs['dump_msgdata'] = dump_msgdata
+    testobj.globs['message_from_string'] = specialized_message_from_string
+    testobj.globs['smtpd'] = SMTPLayer.smtpd
+    testobj.globs['stop'] = stop
+
+
+
+def test_suite():
+    suite = unittest.TestSuite()
+    topdir = os.path.dirname(mailman.__file__)
+    packages = []
+    for dirpath, dirnames, filenames in os.walk(topdir):
+        if 'docs' in dirnames:
+            docsdir = os.path.join(dirpath, 'docs')[len(topdir)+1:]
+            packages.append(docsdir)
+    # Under higher verbosity settings, report all doctest errors, not just the
+    # first one.
+    flags = (doctest.ELLIPSIS |
+             doctest.NORMALIZE_WHITESPACE |
+             doctest.REPORT_NDIFF)
+    # Add all the doctests in all subpackages.
+    doctest_files = {}
+    with chdir(topdir):
+        for docsdir in packages:
+            for filename in os.listdir(docsdir):
+                if os.path.splitext(filename)[1] == '.txt':
+                    doctest_files[filename] = os.path.join(docsdir, filename)
+    files = sorted(doctest_files)
+    for filename in files:
+        path = doctest_files[filename]
+        test = doctest.DocFileSuite(
+            path,
+            package='mailman',
+            optionflags=flags,
+            setUp=setup)
+        test.layer = SMTPLayer
+        suite.addTest(test)
+    return suite