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diff --git a/src/mailman/rest/tests/test_systemconf.py b/src/mailman/rest/tests/test_systemconf.py
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+++ b/src/mailman/rest/tests/test_systemconf.py
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+# Copyright (C) 2014 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 system configuration read-only access."""
+
+__all__ = [
+    'TestSystemConfiguration',
+    ]
+
+
+import unittest
+
+from mailman.testing.helpers import call_api
+from mailman.testing.layers import RESTLayer
+from six.moves.urllib_error import HTTPError
+
+
+
+class TestSystemConfiguration(unittest.TestCase):
+    layer = RESTLayer
+    maxDiff = None
+
+    def test_basic_system_configuration(self):
+        # Read some basic system configuration value, just to prove that the
+        # infrastructure works.
+        url = 'http://localhost:9001/3.0/system/configuration/mailman'
+        json, response = call_api(url)
+        # There must be an `http_etag` key, but we don't care about its value.
+        self.assertIn('http_etag', json)
+        del json['http_etag']
+        self.assertEqual(json, dict(
+            site_owner='noreply@example.com',
+            noreply_address='noreply',
+            default_language='en',
+            sender_headers='from from_ reply-to sender',
+            email_commands_max_lines='10',
+            pending_request_life='3d',
+            pre_hook='',
+            post_hook='',
+            layout='testing',
+            filtered_messages_are_preservable='no',
+            ))
+
+    def test_dotted_section(self):
+        # A dotted section works too.
+        url = 'http://localhost:9001/3.0/system/configuration/language.fr'
+        json, response = call_api(url)
+        # There must be an `http_etag` key, but we don't care about its value.
+        self.assertIn('http_etag', json)
+        del json['http_etag']
+        self.assertEqual(json, dict(
+            description='French',
+            charset='iso-8859-1',
+            enabled='yes',
+            ))
+
+    def test_multiline(self):
+        # Some values contain multiple lines.  It is up to the client to split
+        # on whitespace.
+        url = 'http://localhost:9001/3.0/system/configuration/nntp'
+        json, response = call_api(url)
+        value = json['remove_headers']
+        self.assertEqual(sorted(value.split()), [
+            'date-received',
+            'nntp-posting-date',
+            'nntp-posting-host',
+            'posted',
+            'posting-version',
+            'received',
+            'relay-version',
+            'x-complaints-to',
+            'x-trace',
+            'xref',
+            ])
+
+
+    def test_all_sections(self):
+        # Getting the top level configuration object returns a list of all
+        # existing sections.
+        url = 'http://localhost:9001/3.0/system/configuration'
+        json, response = call_api(url)
+        self.assertIn('http_etag', json)
+        self.assertEqual(sorted(json['sections']), [
+            'antispam',
+            'archiver.mail_archive',
+            'archiver.master',
+            'archiver.mhonarc',
+            'archiver.prototype',
+            'bounces',
+            'database',
+            'devmode',
+            'digests',
+            'language.en',
+            'language.fr',
+            'language.ja',
+            'logging.archiver',
+            'logging.bounce',
+            'logging.config',
+            'logging.database',
+            'logging.debug',
+            'logging.error',
+            'logging.fromusenet',
+            'logging.http',
+            'logging.locks',
+            'logging.mischief',
+            'logging.root',
+            'logging.runner',
+            'logging.smtp',
+            'logging.subscribe',
+            'logging.vette',
+            'mailman',
+            'mta',
+            'nntp',
+            'passwords',
+            'paths.dev',
+            'paths.fhs',
+            'paths.local',
+            'paths.testing',
+            'runner.archive',
+            'runner.bad',
+            'runner.bounces',
+            'runner.command',
+            'runner.digest',
+            'runner.in',
+            'runner.lmtp',
+            'runner.nntp',
+            'runner.out',
+            'runner.pipeline',
+            'runner.rest',
+            'runner.retry',
+            'runner.shunt',
+            'runner.virgin',
+            'shell',
+            'styles',
+            'webservice',
+            ])
+
+    def test_no_such_section(self):
+        # A bogus section returns a 404.
+        url = 'http://localhost:9001/3.0/system/configuration/nosuchsection'
+        with self.assertRaises(HTTPError) as cm:
+            call_api(url)
+        self.assertEqual(cm.exception.code, 404)
+
+    def test_too_many_path_components(self):
+        # More than two path components is an error, even if they name a valid
+        # configuration variable.
+        url = 'http://localhost:9001/3.0/system/configuration/mailman/layout'
+        with self.assertRaises(HTTPError) as cm:
+            call_api(url)
+        self.assertEqual(cm.exception.code, 400)
+
+    def test_read_only(self):
+        # The entire configuration is read-only.
+        url = 'http://localhost:9001/3.0/system/configuration'
+        with self.assertRaises(HTTPError) as cm:
+            call_api(url, {'foo': 'bar'})
+        # 405 is Method Not Allowed.
+        self.assertEqual(cm.exception.code, 405)
+
+    def test_section_read_only(self):
+        # Sections are also read-only.
+        url = 'http://localhost:9001/3.0/system/configuration/mailman'
+        with self.assertRaises(HTTPError) as cm:
+            call_api(url, {'foo': 'bar'})
+        # 405 is Method Not Allowed.
+        self.assertEqual(cm.exception.code, 405)