Added missing file forgotten in r17479.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@17485 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/cache/closeable_cache.py

@@ -0,0 +1,11 @@
+from django.core.cache.backends.locmem import LocMemCache
+
+
+class CloseHookMixin(object):
+    closed = False
+
+    def close(self, **kwargs):
+        self.closed = True
+
+class CacheClass(CloseHookMixin, LocMemCache):
+    pass