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diff --git a/src/mailman/app/tests/test_templates.py b/src/mailman/app/tests/test_templates.py
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+++ b/src/mailman/app/tests/test_templates.py
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+# Copyright (C) 2012 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 the template downloader API."""
+
+from __future__ import absolute_import, print_function, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'TestTemplateLoader',
+    ]
+
+
+import os
+import shutil
+import urllib2
+import tempfile
+import unittest
+
+from zope.component import getUtility
+
+from mailman.app.lifecycle import create_list
+from mailman.config import config
+from mailman.interfaces.languages import ILanguageManager
+from mailman.interfaces.templates import ITemplateLoader
+from mailman.testing.layers import ConfigLayer
+
+
+
+class TestTemplateLoader(unittest.TestCase):
+    """Test the template downloader API."""
+
+    layer = ConfigLayer
+
+    def setUp(self):
+        self.var_dir = tempfile.mkdtemp()
+        config.push('template config', """\
+        [paths.testing]
+        var_dir: {0}
+        """.format(self.var_dir))
+        # Put a demo template in the site directory.
+        path = os.path.join(self.var_dir, 'templates', 'site', 'en')
+        os.makedirs(path)
+        with open(os.path.join(path, 'demo.txt'), 'w') as fp:
+            print('Test content', end='', file=fp)
+        self._loader = getUtility(ITemplateLoader)
+        getUtility(ILanguageManager).add('it', 'utf-8', 'Italian')
+        self._mlist = create_list('test@example.com')
+
+    def tearDown(self):
+        config.pop('template config')
+        shutil.rmtree(self.var_dir)
+
+    def test_mailman_internal_uris(self):
+        # mailman://demo.txt
+        content = self._loader.get('mailman:///demo.txt')
+        self.assertEqual(content, 'Test content')
+
+    def test_mailman_internal_uris_twice(self):
+        # mailman:///demo.txt
+        content = self._loader.get('mailman:///demo.txt')
+        self.assertEqual(content, 'Test content')
+        content = self._loader.get('mailman:///demo.txt')
+        self.assertEqual(content, 'Test content')
+
+    def test_mailman_uri_with_language(self):
+        content = self._loader.get('mailman:///en/demo.txt')
+        self.assertEqual(content, 'Test content')
+
+    def test_mailman_uri_with_english_fallback(self):
+        content = self._loader.get('mailman:///it/demo.txt')
+        self.assertEqual(content, 'Test content')
+
+    def test_mailman_uri_with_list_name(self):
+        content = self._loader.get('mailman:///test@example.com/demo.txt')
+        self.assertEqual(content, 'Test content')
+
+    def test_mailman_full_uri(self):
+        content = self._loader.get('mailman:///test@example.com/en/demo.txt')
+        self.assertEqual(content, 'Test content')
+
+    def test_mailman_full_uri_with_english_fallback(self):
+        content = self._loader.get('mailman:///test@example.com/it/demo.txt')
+        self.assertEqual(content, 'Test content')
+
+    def test_uri_not_found(self):
+        try:
+            self._loader.get('mailman:///missing.txt')
+        except urllib2.URLError as error:
+            self.assertEqual(error.reason, 'No such file')
+        else:
+            raise AssertionError('Exception expected')
+
+    def test_shorter_url_error(self):
+        try:
+            self._loader.get('mailman:///')
+        except urllib2.URLError as error:
+            self.assertEqual(error.reason, 'No template specified')
+        else:
+            raise AssertionError('Exception expected')
+
+    def test_short_url_error(self):
+        try:
+            self._loader.get('mailman://')
+        except urllib2.URLError as error:
+            self.assertEqual(error.reason, 'No template specified')
+        else:
+            raise AssertionError('Exception expected')
+
+    def test_bad_language(self):
+        try:
+            self._loader.get('mailman:///xx/demo.txt')
+        except urllib2.URLError as error:
+            self.assertEqual(error.reason, 'Bad language or list name')
+        else:
+            raise AssertionError('Exception expected')
+
+    def test_bad_mailing_list(self):
+        try:
+            self._loader.get('mailman:///missing@example.com/demo.txt')
+        except urllib2.URLError as error:
+            self.assertEqual(error.reason, 'Bad language or list name')
+        else:
+            raise AssertionError('Exception expected')
+
+    def test_too_many_path_components(self):
+        try:
+            self._loader.get('mailman:///missing@example.com/en/foo/demo.txt')
+        except urllib2.URLError as error:
+            self.assertEqual(error.reason, 'No such file')
+        else:
+            raise AssertionError('Exception expected')