def test_delta(self):
tracker = Tracker()
for attempt in range(tracker.backoff.max_attempts):
if attempt == 0:
assert tracker.delta() == timedelta()
continue
tracker.attempt()
assert tracker.delta() == tracker.backoff.deltas[attempt]
assert tracker.delta() == timedelta(seconds=2**attempt)
# Should cap at max_attempts to highest delta
tracker.attempts = tracker.backoff.max_attempts + 20
assert tracker.delta() == timedelta(
seconds=2**tracker.backoff.max_attempts)
def test_expires_overflow(self):
tracker = Tracker()
tracker.attempts = 15
tracker.last_attempt = datetime.max
assert tracker.expires() == datetime.max