def test_exists_for_invalid_key(self):
client = mock.Mock()
client.get.return_value = None
store = MemcacheBackingStore(60, client)
self.assertFalse(store.exists("get_templates"))
client.get.assert_called_once_with("get_templates")
def test_exists(self):
client = mock.Mock()
client.get.return_value = (10, "value")
store = MemcacheBackingStore(60, client)
self.assertTrue(store.exists("get_templates"))
client.get.assert_called_once_with("get_templates")
