Fixed test failure on Postgres that was added in r16510.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@16512 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/cache/tests.py

@@ -2,6 +2,7 @@
 
 # Unit tests for cache framework
 # Uses whatever cache backend is set in the test settings file.
+from __future__ import with_statement
 
 import hashlib
 import os
@@ -775,8 +776,8 @@ class DBCacheRouter(object):
 
 class CreateCacheTableForDBCacheTests(unittest.TestCase):
 
-    @override_settings(DEBUG=True)
     def test_createcachetable_observes_database_router(self):
+        with override_settings(DEBUG=True):
             old_routers = router.routers
             try:
                 router.routers = [DBCacheRouter()]