Make test_favicon tests work independently

lms/djangoapps/courseware/tests/test_favicon.py

@@ -9,12 +9,14 @@ from nose.plugins.attrib import attr
 
 import sys
 
+from util.testing import UrlResetMixin
+
 
 @attr('shard_1')
-class FaviconTestCase(TestCase):
-
-    def setUp(self):
-        super(FaviconTestCase, self).setUp()
+class FaviconTestCase(UrlResetMixin, TestCase):
+    """
+    Tests of the courseware favicon.
+    """
 
     def test_favicon_redirect(self):
         resp = self.client.get("/favicon.ico")
@@ -27,15 +29,7 @@ class FaviconTestCase(TestCase):
 
     @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("/")
+        self.reset_urls()
 
         resp = self.client.get("/favicon.ico")
         self.assertEqual(resp.status_code, 301)
@@ -46,14 +40,16 @@ class FaviconTestCase(TestCase):
         )
 
     @patch.dict("django.conf.settings.FEATURES", {"USE_CUSTOM_THEME": True})
+    @override_settings(FAVICON_PATH="images/bar_fav.ico")
     @override_settings(THEME_NAME="bar")
     def test_favicon_redirect_with_theme(self):
         self.assertEqual(settings.FEATURES["USE_CUSTOM_THEME"], True)
+        self.reset_urls()
 
         resp = self.client.get("/favicon.ico")
         self.assertEqual(resp.status_code, 301)
         self.assertRedirects(
             resp,
-            "/static/images/foo.ico",
+            "/static/images/bar_fav.ico",
             status_code=301, target_status_code=404  # @@@ how to avoid 404?
         )