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
def test_memory_backend_errors():
backend = MemoryBackend(1) # seconds
backend.set('key', t, 'value')
[[time, value]] = backend.get('key',
start=datetime.now() - timedelta(seconds=0.5),
end=datetime.now())
assert type(time) is datetime
assert value == 'value'
with raises(BackendError):
print(backend.get('key',
start=datetime.now() - timedelta(seconds=1.5),
end=datetime.now()))
def test_glue_backend_dispatch():
mem = MemoryBackend(1)
bin = BinaryBackend()
csv = CSVBackend()
glue = GlueBackend(mem, bin, csv)
glue.set('key', t, 1)
assert glue.get('key')[0][1] == 1
assert glue.get('key') == mem.get('key') == csv.get('key')
glue.clear()
glue.set('key', t, 'value')
assert glue.get('key')[0][1] == 'value'
assert glue.get('key') == mem.get('key') == csv.get('key')
assert bin.get('key') == []