def test_save_and_load(self):
cache_name = self.check_cache_gone('save_load')
cache = PersistentCache(cache_name, cache_manager=self.manager)
cache['foo'] = 'bar'
cache.save()
cache.contents = {}
self.assert_contents_equal(cache, {})
cache.load()
self.assertEqual(cache['foo'], 'bar')
