59 lines
2.2 KiB
TypeScript
59 lines
2.2 KiB
TypeScript
// Copyright 2021 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { assert } from 'chai';
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import * as durations from '../../util/durations';
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import {
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exponentialBackoffSleepTime,
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exponentialBackoffMaxAttempts,
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} from '../../util/exponentialBackoff';
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describe('exponential backoff utilities', () => {
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describe('exponentialBackoffSleepTime', () => {
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it('returns slowly growing values', () => {
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assert.strictEqual(exponentialBackoffSleepTime(1), 0);
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assert.strictEqual(exponentialBackoffSleepTime(2), 190);
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assert.strictEqual(exponentialBackoffSleepTime(3), 361);
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assert.approximately(exponentialBackoffSleepTime(4), 686, 1);
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assert.approximately(exponentialBackoffSleepTime(5), 1303, 1);
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});
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it('plateaus at a maximum after 15 attempts', () => {
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const maximum = 15 * durations.MINUTE;
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for (let attempt = 16; attempt < 100; attempt += 1) {
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assert.strictEqual(exponentialBackoffSleepTime(attempt), maximum);
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}
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});
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it('respects custom variables', () => {
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const options = {
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maxBackoffTime: 10000,
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multiplier: 2,
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firstBackoffs: [1000],
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};
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assert.strictEqual(exponentialBackoffSleepTime(1, options), 1000);
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assert.strictEqual(exponentialBackoffSleepTime(2, options), 2000);
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assert.strictEqual(exponentialBackoffSleepTime(3, options), 4000);
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assert.strictEqual(exponentialBackoffSleepTime(4, options), 8000);
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assert.strictEqual(exponentialBackoffSleepTime(5, options), 10000);
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assert.strictEqual(exponentialBackoffSleepTime(6, options), 10000);
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});
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});
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describe('exponentialBackoffMaxAttempts', () => {
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it('returns 2 attempts for a short period of time', () => {
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assert.strictEqual(exponentialBackoffMaxAttempts(1), 2);
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assert.strictEqual(exponentialBackoffMaxAttempts(99), 2);
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});
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it('returns 6 attempts for a 5 seconds', () => {
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assert.strictEqual(exponentialBackoffMaxAttempts(5000), 6);
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});
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it('returns 110 attempts for 1 day', () => {
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// This is a test case that is lifted from iOS's codebase.
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assert.strictEqual(exponentialBackoffMaxAttempts(durations.DAY), 110);
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});
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});
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});
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