import random from units.compat import unittest from ansible.module_utils.cloud import _exponential_backoff, \ _full_jitter_backoff class ExponentialBackoffStrategyTestCase(unittest.TestCase): def test_no_retries(self): strategy = _exponential_backoff(retries=0) result = list(strategy()) self.assertEquals(result, [], 'list should be empty') def test_exponential_backoff(self): strategy = _exponential_backoff(retries=5, delay=1, backoff=2) result = list(strategy()) self.assertEquals(result, [1, 2, 4, 8, 16]) def test_max_delay(self): strategy = _exponential_backoff(retries=7, delay=1, backoff=2, max_delay=60) result = list(strategy()) self.assertEquals(result, [1, 2, 4, 8, 16, 32, 60]) def test_max_delay_none(self): strategy = _exponential_backoff(retries=7, delay=1, backoff=2, max_delay=None) result = list(strategy()) self.assertEquals(result, [1, 2, 4, 8, 16, 32, 64]) class FullJitterBackoffStrategyTestCase(unittest.TestCase): def test_no_retries(self): strategy = _full_jitter_backoff(retries=0) result = list(strategy()) self.assertEquals(result, [], 'list should be empty') def test_full_jitter(self): retries = 5 seed = 1 r = random.Random(seed) expected = [r.randint(0, 2**i) for i in range(0, retries)] strategy = _full_jitter_backoff( retries=retries, delay=1, _random=random.Random(seed)) result = list(strategy()) self.assertEquals(result, expected)