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diff --git a/src/mailman/rest/tests/test_helpers.py b/src/mailman/rest/tests/test_helpers.py
new file mode 100644
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+++ b/src/mailman/rest/tests/test_helpers.py
@@ -0,0 +1,82 @@
+# Copyright (C) 2016 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/>.
+
+"""Additional tests for helpers."""
+
+__all__ = [
+    'TestHelpers',
+    ]
+
+
+import unittest
+
+from datetime import timedelta
+from mailman.rest import helpers
+from mailman.testing.layers import ConfigLayer
+
+
+class FakeResponse:
+    def __init__(self):
+        self.body = 'not set'
+
+
+class Unserializable:
+    pass
+
+
+
+class TestHelpers(unittest.TestCase):
+    layer = ConfigLayer
+
+    def test_not_found_body_is_none(self):
+        response = FakeResponse()
+        helpers.not_found(response, body=None)
+        self.assertEqual(response.body, 'not set')
+
+    def test_accepted_body_is_not_none(self):
+        response = FakeResponse()
+        helpers.accepted(response, body='set')
+        self.assertEqual(response.body, 'set')
+
+    def test_bad_request_body_is_none(self):
+        response = FakeResponse()
+        helpers.bad_request(response, body=None)
+        self.assertEqual(response.body, 'not set')
+
+    def test_conflict_body_is_none(self):
+        response = FakeResponse()
+        helpers.conflict(response, body=None)
+        self.assertEqual(response.body, 'not set')
+
+    def test_forbidden_body_is_none(self):
+        response = FakeResponse()
+        helpers.forbidden(response, body=None)
+        self.assertEqual(response.body, 'not set')
+
+    def test_json_encoding_datetime_seconds(self):
+        resource = dict(interval=timedelta(seconds=2))
+        unjson = eval(helpers.etag(resource))
+        self.assertEqual(unjson['interval'], '0d2.0s')
+
+    def test_json_encoding_datetime_microseconds(self):
+        resource = dict(interval=timedelta(microseconds=2))
+        unjson = eval(helpers.etag(resource))
+        self.assertEqual(unjson['interval'], '0d2e-06s')
+
+    def test_json_encoding_default(self):
+        resource = dict(interval=Unserializable())
+        self.assertRaises(TypeError, helpers.etag, resource)