def test_glue_tries_to_get_from_other_backends_if_gets_empty_list():
mem = MemoryBackend(9)
csv = CSVBackend()
glue = GlueBackend(mem, csv)
glue.set('key', t, 9)
mem.clear() # say, machine was rebooted, but csv files are still there
assert glue.get('key')[0][1] == 9
