def test_exponential_retry_interval(self):
# Arrange
initial_backoff = 15
increment_power = 3
retry_policy = ExponentialRetry(initial_backoff, increment_power)
context_stub = RetryContext()
# Act
context_stub.count = 0
backoff = retry_policy._backoff(context_stub)
# Assert
self.assertEqual(backoff, 15)
# Act
context_stub.count = 1
backoff = retry_policy._backoff(context_stub)
# Assert
self.assertEqual(backoff, 18)
# Act
context_stub.count = 2
backoff = retry_policy._backoff(context_stub)
# Assert
self.assertEqual(backoff, 24)
# Act
context_stub.count = 3
backoff = retry_policy._backoff(context_stub)
# Assert
self.assertEqual(backoff, 42)
def test_exponential_retry_interval(self):
# Arrange
retry_policy = ExponentialRetry(initial_backoff=1,
increment_base=3,
random_jitter_range=3)
context_stub = RetryContext()
for i in range(10):
# Act
context_stub.count = 0
backoff = retry_policy._backoff(context_stub)
# Assert backoff interval is within +/- 3 of 1
self.assertTrue(0 <= backoff <= 4)
# Act
context_stub.count = 1
backoff = retry_policy._backoff(context_stub)
# Assert backoff interval is within +/- 3 of 4(1+3^1)
self.assertTrue(1 <= backoff <= 7)
# Act
context_stub.count = 2
backoff = retry_policy._backoff(context_stub)
# Assert backoff interval is within +/- 3 of 10(1+3^2)
self.assertTrue(7 <= backoff <= 13)
# Act
context_stub.count = 3
backoff = retry_policy._backoff(context_stub)
# Assert backoff interval is within +/- 3 of 28(1+3^3)
self.assertTrue(25 <= backoff <= 31)
def test_exponential_retry_interval(self):
# Arrange
initial_backoff = 15
increment_power = 3
retry_policy = ExponentialRetry(initial_backoff, increment_power)
context_stub = RetryContext()
# Act
context_stub.count = 0
backoff = retry_policy._backoff(context_stub)
# Assert
self.assertEqual(backoff, 15)
# Act
context_stub.count = 1
backoff = retry_policy._backoff(context_stub)
# Assert
self.assertEqual(backoff, 18)
# Act
context_stub.count = 2
backoff = retry_policy._backoff(context_stub)
# Assert
self.assertEqual(backoff, 24)
# Act
context_stub.count = 3
backoff = retry_policy._backoff(context_stub)
# Assert
self.assertEqual(backoff, 42)