diff --git a/analytical/tests/test_tag_chartbeat.py b/analytical/tests/test_tag_chartbeat.py
index 0a503e7..fc7c245 100644
--- a/analytical/tests/test_tag_chartbeat.py
+++ b/analytical/tests/test_tag_chartbeat.py
@@ -11,9 +11,15 @@ from django.template import Context
 
 from analytical.templatetags.chartbeat import ChartbeatTopNode, \
         ChartbeatBottomNode
-from analytical.tests.utils import TagTestCase
+from analytical.tests.utils import TagTestCase, override_settings
 from analytical.utils import AnalyticalException
 
+@override_settings(INSTALLED_APPS=[
+        a for a in settings.INSTALLED_APPS if a != 'django.contrib.sites'])
+class ChartbeatTagTestCaseNoSites(TagTestCase):
+    def test_rendering_setup_no_site(self):
+        r = ChartbeatBottomNode().render(Context())
+        self.assertTrue('var _sf_async_config={"uid": "12345"};' in r, r)
 
 class ChartbeatTagTestCase(TagTestCase):
     """
@@ -58,13 +64,6 @@ class ChartbeatTagTestCase(TagTestCase):
         self.settings_manager.set(CHARTBEAT_USER_ID='123abc')
         self.assertRaises(AnalyticalException, ChartbeatBottomNode)
 
-    def test_rendering_setup_no_site(self):
-        installed_apps = [a for a in settings.INSTALLED_APPS
-                if a != 'django.contrib.sites']
-        self.settings_manager.set(INSTALLED_APPS=installed_apps)
-        r = ChartbeatBottomNode().render(Context())
-        self.assertTrue('var _sf_async_config={"uid": "12345"};' in r, r)
-
     def test_rendering_setup_site(self):
         installed_apps = list(settings.INSTALLED_APPS)
         installed_apps.append('django.contrib.sites')
diff --git a/analytical/tests/utils.py b/analytical/tests/utils.py
index 0304145..ff2b09c 100644
--- a/analytical/tests/utils.py
+++ b/analytical/tests/utils.py
@@ -2,13 +2,49 @@
 Testing utilities.
 """
 
-from django.conf import settings
+from __future__ import with_statement
+from django.conf import settings, UserSettingsHolder
 from django.core.management import call_command
 from django.db.models import loading
 from django.template import Template, Context, RequestContext
 from django.test.simple import run_tests as django_run_tests
 from django.test.testcases import TestCase as DjangoTestCase
+from django.utils.functional import wraps
 
+class override_settings(object):
+    """
+    Acts as either a decorator, or a context manager.  If it's a decorator it
+    takes a function and returns a wrapped function.  If it's a contextmanager
+    it's used with the ``with`` statement.  In either event entering/exiting
+    are called before and after, respectively, the function/block is executed.
+
+    Via: http://djangosnippets.org/snippets/2437/
+    """
+    def __init__(self, **kwargs):
+        self.options = kwargs
+        self.wrapped = settings._wrapped
+
+    def __enter__(self):
+        self.enable()
+
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.disable()
+
+    def __call__(self, func):
+        @wraps(func)
+        def inner(*args, **kwargs):
+            with self:
+                return func(*args, **kwargs)
+        return inner
+
+    def enable(self):
+        override = UserSettingsHolder(settings._wrapped)
+        for key, new_value in self.options.items():
+            setattr(override, key, new_value)
+        settings._wrapped = override
+
+    def disable(self):
+        settings._wrapped = self.wrapped
 
 def run_tests(labels=()):
     """