def test_expires(self):
tracker = Tracker()
for attempt in range(tracker.backoff.max_attempts):
now = datetime.utcnow()
if attempt == 0:
assert tracker.expires() < datetime.utcnow()
continue
tracker.attempt()
expect_delta = timedelta(seconds=2**attempt)
assert tracker.expires() > datetime.utcnow()
tracker.last_attempt = now - expect_delta
assert tracker.expires() < datetime.utcnow()
tracker.last_attempt = now - (expect_delta * 2)
assert tracker.expires() < datetime.utcnow()
tracker.last_attempt = now + expect_delta
assert tracker.expires() > datetime.utcnow()
tracker.last_attempt = now + (expect_delta * 2)
assert tracker.expires() > datetime.utcnow()
def test_expires_overflow(self):
tracker = Tracker()
tracker.attempts = 15
tracker.last_attempt = datetime.max
assert tracker.expires() == datetime.max