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import unittest
from justbackoff import Backoff, to_seconds
class CustomAssertions:
@staticmethod
def assert_between(actual: float, low: float, high: float):
if actual < low:
raise AssertionError("Got {}, expecting >= {}".format(actual, low))
if actual > high:
msg = "Got {}, expecting <= {}".format(actual, high)
raise AssertionError(msg)
class TestBackoff(unittest.TestCase, CustomAssertions):
def setUp(self):
self.b = Backoff(min_ms=100.0, max_ms=10000.0, factor=2.0)
def test_defaults(self):
self.assertEqual(self.b.duration(), to_seconds(100.0))
self.assertEqual(self.b.duration(), to_seconds(200.0))
self.assertEqual(self.b.duration(), to_seconds(400.0))
self.b.reset()
self.assertEqual(self.b.duration(), to_seconds(100.0))
def test_factor(self):
b = Backoff(min_ms=100, max_ms=10000, factor=1.5)
self.assertEqual(b.duration(), to_seconds(100.0))
self.assertEqual(b.duration(), to_seconds(150.0))
self.assertEqual(b.duration(), to_seconds(225.0))
b.reset()
self.assertEqual(b.duration(), to_seconds(100.0))
def test_for_attempt(self):
self.assertEqual(self.b.for_attempt(0), to_seconds(100.0))
self.assertEqual(self.b.for_attempt(1), to_seconds(200.0))
self.assertEqual(self.b.for_attempt(2), to_seconds(400.0))
self.b.reset()
self.assertEqual(self.b.for_attempt(0), to_seconds(100.0))
def test_get_attempt(self):
self.assertEqual(self.b.attempt(), 0)
self.assertEqual(self.b.duration(), to_seconds(100.0))
self.assertEqual(self.b.attempt(), 1)
self.assertEqual(self.b.duration(), to_seconds(200.0))
self.assertEqual(self.b.attempt(), 2)
self.assertEqual(self.b.duration(), to_seconds(400.0))
self.assertEqual(self.b.attempt(), 3)
self.b.reset()
self.assertEqual(self.b.attempt(), 0)
self.assertEqual(self.b.duration(), to_seconds(100.0))
self.assertEqual(self.b.attempt(), 1)
def test_jitter(self):
b = Backoff(min_ms=100.0, max_ms=10000.0, factor=2.0, jitter=True)
self.assertEqual(b.duration(), to_seconds(100.0))
self.assert_between(b.duration(), to_seconds(100.0), to_seconds(200.0))
self.assert_between(b.duration(), to_seconds(100.0), to_seconds(400.0))
b.reset()
self.assertEqual(b.duration(), to_seconds(100.0))
def test_integers(self):
b = Backoff(min_ms=100, max_ms=10000, factor=2)
self.assertEqual(b.duration(), to_seconds(100.0))
self.assertEqual(b.duration(), to_seconds(200.0))
self.assertEqual(b.duration(), to_seconds(400.0))
b.reset()
self.assertEqual(b.duration(), to_seconds(100.0))
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