Add another code-path test.

src/mailman/rest/tests/test_owners.py

+# Copyright (C) 2015 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 the top-level owners resource."""
+
+__all__ = [
+    'TestOwners',
+    ]
+
+
+import unittest
+
+from mailman.testing.helpers import call_api
+from mailman.testing.layers import RESTLayer
+from urllib.error import HTTPError
+
+
+
+class TestOwners(unittest.TestCase):
+    layer = RESTLayer
+
+    def test_bogus_trailing_path(self):
+        # Nothing is allowed after the top-level /owners resource.
+        with self.assertRaises(HTTPError) as cm:
+            call_api('http://localhost:9001/3.0/owners/anne')
+        self.assertEqual(cm.exception.code, 400)