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