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72 lines
2.4 KiB
Text
72 lines
2.4 KiB
Text
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import {BackoffScheduler, ExponentialBackoffScheduler} from '../../src/services/backoff-schedulers'
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describe('BackoffSchedulers', function describeBlock() {
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describe('BackoffScheduler', () => {
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function linearBackoff(base, numTries) {
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return base * numTries
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}
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it('calculates the next delay correctly with no jitter', () => {
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const scheduler = new BackoffScheduler({
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jitter: false,
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baseDelay: 2,
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maxDelay: 5,
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getNextBackoffDelay: linearBackoff,
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})
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expect(scheduler.nextDelay()).toEqual(0)
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expect(scheduler.nextDelay()).toEqual(2)
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expect(scheduler.nextDelay()).toEqual(4)
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expect(scheduler.nextDelay()).toEqual(5)
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expect(scheduler.nextDelay()).toEqual(5)
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})
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it('calculates the next delay correctly with jitter', () => {
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spyOn(Math, 'random').andReturn(0.5)
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const scheduler = new BackoffScheduler({
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jitter: true,
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baseDelay: 2,
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maxDelay: 5,
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getNextBackoffDelay: linearBackoff,
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})
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expect(scheduler.nextDelay()).toEqual(0)
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expect(scheduler.nextDelay()).toEqual(1)
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expect(scheduler.nextDelay()).toEqual(2)
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expect(scheduler.nextDelay()).toEqual(3)
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expect(scheduler.nextDelay()).toEqual(4)
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expect(scheduler.nextDelay()).toEqual(5)
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expect(scheduler.nextDelay()).toEqual(5)
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})
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});
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describe('ExponentialBackoffScheduler', () => {
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it('calculates the next delay correctly with no jitter', () => {
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const scheduler = new ExponentialBackoffScheduler({
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jitter: false,
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baseDelay: 2,
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maxDelay: 10,
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})
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expect(scheduler.nextDelay()).toEqual(2)
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expect(scheduler.nextDelay()).toEqual(4)
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expect(scheduler.nextDelay()).toEqual(8)
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expect(scheduler.nextDelay()).toEqual(10)
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expect(scheduler.nextDelay()).toEqual(10)
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})
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it('calculates the next delay correctly with no jitter', () => {
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spyOn(Math, 'random').andReturn(0.5)
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const scheduler = new ExponentialBackoffScheduler({
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jitter: true,
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baseDelay: 2,
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maxDelay: 10,
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})
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expect(scheduler.nextDelay()).toEqual(1)
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expect(scheduler.nextDelay()).toEqual(2)
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expect(scheduler.nextDelay()).toEqual(4)
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expect(scheduler.nextDelay()).toEqual(8)
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expect(scheduler.nextDelay()).toEqual(10)
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expect(scheduler.nextDelay()).toEqual(10)
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})
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});
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});
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