def test_decrease_worker_count(self):
autoscaling = RuleBasedStrategy(70, 80)
worker_pool = self.prepare_service(worker_count=5, utilisation=50.)
actual = autoscaling.adjust(worker_pool)
self.assertEqual(4, actual)
def test_increase_when_utilisation_too_high(self):
autoscaling = RuleBasedStrategy(70, 80)
worker_pool = self.prepare_service(worker_count=4, utilisation=100.)
actual = autoscaling.adjust(worker_pool)
self.assertEqual(5, actual)
def test_does_not_change_a_value_within_the_range(self):
worker_count = 4
autoscaling = RuleBasedStrategy(70, 80)
service = self.prepare_service(worker_count, utilisation=75.)
actual = autoscaling.adjust(service)
self.assertEqual(worker_count, actual)
def create_autoscaler(self, environment, autoscaling):
strategy = RuleBasedStrategy(70, 80)
return AutoScaler(environment, autoscaling.period, autoscaling.limits,
strategy)
