80 lines
2.4 KiB
JavaScript
80 lines
2.4 KiB
JavaScript
import ConnectionMonitor from '~/actioncable_connection_monitor';
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describe('ConnectionMonitor', () => {
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let monitor;
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beforeEach(() => {
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monitor = new ConnectionMonitor({});
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});
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describe('#getPollInterval', () => {
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beforeEach(() => {
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Math.originalRandom = Math.random;
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});
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afterEach(() => {
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Math.random = Math.originalRandom;
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});
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const { staleThreshold, reconnectionBackoffRate } = ConnectionMonitor;
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const backoffFactor = 1 + reconnectionBackoffRate;
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const ms = 1000;
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it('uses exponential backoff', () => {
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Math.random = () => 0;
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monitor.reconnectAttempts = 0;
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expect(monitor.getPollInterval()).toEqual(staleThreshold * ms);
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monitor.reconnectAttempts = 1;
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expect(monitor.getPollInterval()).toEqual(staleThreshold * backoffFactor * ms);
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monitor.reconnectAttempts = 2;
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expect(monitor.getPollInterval()).toEqual(
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staleThreshold * backoffFactor * backoffFactor * ms,
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);
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});
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it('caps exponential backoff after some number of reconnection attempts', () => {
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Math.random = () => 0;
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monitor.reconnectAttempts = 42;
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const cappedPollInterval = monitor.getPollInterval();
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monitor.reconnectAttempts = 9001;
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expect(monitor.getPollInterval()).toEqual(cappedPollInterval);
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});
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it('uses 100% jitter when 0 reconnection attempts', () => {
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Math.random = () => 0;
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expect(monitor.getPollInterval()).toEqual(staleThreshold * ms);
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Math.random = () => 0.5;
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expect(monitor.getPollInterval()).toEqual(staleThreshold * 1.5 * ms);
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});
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it('uses reconnectionBackoffRate for jitter when >0 reconnection attempts', () => {
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monitor.reconnectAttempts = 1;
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Math.random = () => 0.25;
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expect(monitor.getPollInterval()).toEqual(
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staleThreshold * backoffFactor * (1 + reconnectionBackoffRate * 0.25) * ms,
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);
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Math.random = () => 0.5;
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expect(monitor.getPollInterval()).toEqual(
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staleThreshold * backoffFactor * (1 + reconnectionBackoffRate * 0.5) * ms,
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);
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});
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it('applies jitter after capped exponential backoff', () => {
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monitor.reconnectAttempts = 9001;
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Math.random = () => 0;
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const withoutJitter = monitor.getPollInterval();
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Math.random = () => 0.5;
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const withJitter = monitor.getPollInterval();
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expect(withJitter).toBeGreaterThan(withoutJitter);
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});
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});
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});
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