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diff --git a/objectapp/tests/url_shortener.py b/objectapp/tests/url_shortener.py
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+++ b/objectapp/tests/url_shortener.py
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+# Copyright (c) 2011,  2012 Free Software Foundation
+
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU Affero General Public License as
+#     published by the Free Software Foundation, either version 3 of the
+#     License, or (at your option) any later version.
+
+#     This program 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 Affero General Public License for more details.
+
+#     You should have received a copy of the GNU Affero General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+# This project incorporates work covered by the following copyright and permission notice:  
+
+#    Copyright (c) 2009, Julien Fache
+#    All rights reserved.
+
+#    Redistribution and use in source and binary forms, with or without
+#    modification, are permitted provided that the following conditions
+#    are met:
+
+#    * Redistributions of source code must retain the above copyright
+#      notice, this list of conditions and the following disclaimer.
+#    * Redistributions in binary form must reproduce the above copyright
+#      notice, this list of conditions and the following disclaimer in
+#      the documentation and/or other materials provided with the
+#      distribution.
+#    * Neither the name of the author nor the names of other
+#      contributors may be used to endorse or promote products derived
+#      from this software without specific prior written permission.
+
+#    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+#    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+#    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+#    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+#    COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+#    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+#    (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+#    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+#    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+#    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+#    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+#    OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Copyright (c) 2011,  2012 Free Software Foundation
+
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU Affero General Public License as
+#     published by the Free Software Foundation, either version 3 of the
+#     License, or (at your option) any later version.
+
+#     This program 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 Affero General Public License for more details.
+
+#     You should have received a copy of the GNU Affero General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+"""Test cases for Objectapp's url_shortener"""
+from __future__ import with_statement
+import warnings
+
+from django.test import TestCase
+
+from objectapp.url_shortener import get_url_shortener
+from objectapp import url_shortener as us_settings
+from objectapp.url_shortener.backends.default import backend as default_backend
+
+
+class URLShortenerTestCase(TestCase):
+    """Test cases for objectapp.url_shortener"""
+
+    def setUp(self):
+        self.original_backend = us_settings.URL_SHORTENER_BACKEND
+
+    def tearDown(self):
+        us_settings.URL_SHORTENER_BACKEND = self.original_backend
+
+    def test_get_url_shortener(self):
+        us_settings.URL_SHORTENER_BACKEND = 'mymodule.myclass'
+        try:
+            with warnings.catch_warnings(record=True) as w:
+                self.assertEquals(get_url_shortener(), default_backend)
+                self.assertTrue(issubclass(w[-1].Objecttype, RuntimeWarning))
+                self.assertEquals(
+                    str(w[-1].message),
+                    'mymodule.myclass backend cannot be imported')
+        except AttributeError:
+            # Fail under Python2.5, because of'warnings.catch_warnings'
+            pass
+
+        us_settings.URL_SHORTENER_BACKEND = 'objectapp.tests.custom_url_shortener'
+        try:
+            with warnings.catch_warnings(record=True) as w:
+                self.assertEquals(get_url_shortener(), default_backend)
+                self.assertTrue(issubclass(w[-1].Objecttype, RuntimeWarning))
+                self.assertEquals(
+                    str(w[-1].message),
+                    'This backend only exists for testing')
+        except AttributeError:
+            # Fail under Python2.5, because of'warnings.catch_warnings'
+            pass
+
+        us_settings.URL_SHORTENER_BACKEND = 'objectapp.url_shortener'\
+                                            '.backends.default'
+        self.assertEquals(get_url_shortener(), default_backend)