tests for PR 3769

Two out of three fail without PR 3769 but all pass with PR 3769.

lms/djangoapps/courseware/tests/test_favicon.py

+from django.conf import settings
+from django.core.urlresolvers import clear_url_caches, resolve
+
+from django.test import TestCase
+from django.test.utils import override_settings
+
+from mock import patch
+
+import sys
+
+
+class FaviconTestCase(TestCase):
+
+    def setUp(self):
+        super(FaviconTestCase, self).setUp()
+
+    def test_favicon_redirect(self):
+        resp = self.client.get("/favicon.ico")
+        self.assertEqual(resp.status_code, 301)
+        self.assertRedirects(
+            resp,
+            "/static/images/favicon.ico",
+            status_code=301, target_status_code=404  # @@@ how to avoid 404?
+        )
+
+    @override_settings(FAVICON_PATH="images/foo.ico")
+    def test_favicon_redirect_with_favicon_path_setting(self):
+
+        # for some reason I had to put this inline rather than just using
+        # the UrlResetMixin
+
+        urlconf = settings.ROOT_URLCONF
+        if urlconf in sys.modules:
+            reload(sys.modules[urlconf])
+        clear_url_caches()
+        resolve("/")
+
+        resp = self.client.get("/favicon.ico")
+        self.assertEqual(resp.status_code, 301)
+        self.assertRedirects(
+            resp,
+            "/static/images/foo.ico",
+            status_code=301, target_status_code=404  # @@@ how to avoid 404?
+        )
+
+    @patch.dict("django.conf.settings.FEATURES", {"USE_CUSTOM_THEME": True})
+    @override_settings(THEME_NAME="bar")
+    def test_favicon_redirect_with_theme(self):
+        self.assertEqual(settings.FEATURES["USE_CUSTOM_THEME"], True)
+
+        resp = self.client.get("/favicon.ico")
+        self.assertEqual(resp.status_code, 301)
+        self.assertRedirects(
+            resp,
+            "/static/images/foo.ico",
+            status_code=301, target_status_code=404  # @@@ how to avoid 404?
+        )