=== modified file 'django/contrib/contenttypes/tests.py'
--- django/contrib/contenttypes/tests.py	2011-03-16 17:43:12 +0000
+++ django/contrib/contenttypes/tests.py	2011-03-16 17:47:30 +0000
@@ -20,6 +20,7 @@
         db.reset_queries()
 
     def tearDown(self):
+        ContentType.objects.clear_cache()
         settings.DEBUG = self.old_DEBUG
         Site._meta.installed = self.old_Site_meta_installed