56 lines
2.2 KiB
TypeScript
56 lines
2.2 KiB
TypeScript
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import { describe, expect, test } from 'bun:test';
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import {
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CRASH_RECOVERY_BASE_DELAY_MS,
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CRASH_RECOVERY_MAX_ATTEMPTS,
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CRASH_RECOVERY_WINDOW_MS,
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INITIAL_CRASH_RECOVERY_STATE,
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planCrashRecovery,
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} from './crashRecovery';
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describe('crash recovery', () => {
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test('recovers from the first crash immediately enough to feel automatic', () => {
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const plan = planCrashRecovery(INITIAL_CRASH_RECOVERY_STATE, 1_000);
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expect(plan?.delayMs).toBe(CRASH_RECOVERY_BASE_DELAY_MS);
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expect(plan?.state).toEqual({ attempts: 1, windowStartedAt: 1_000 });
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});
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test('waits longer after each attempt instead of reloading in a tight loop', () => {
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let state = INITIAL_CRASH_RECOVERY_STATE;
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const delays: number[] = [];
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for (let index = 0; index < CRASH_RECOVERY_MAX_ATTEMPTS; index += 1) {
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const plan = planCrashRecovery(state, 1_000 + index);
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expect(plan === null).toBe(false);
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delays.push(plan!.delayMs);
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state = plan!.state;
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}
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expect(delays).toEqual([250, 500, 1000]);
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});
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test('gives up once the attempts in this window are spent', () => {
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let state = INITIAL_CRASH_RECOVERY_STATE;
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for (let index = 0; index < CRASH_RECOVERY_MAX_ATTEMPTS; index += 1) {
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state = planCrashRecovery(state, 1_000)!.state;
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}
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expect(planCrashRecovery(state, 1_000)).toBeNull();
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});
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test('a crash long after the last one starts over rather than staying given up', () => {
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let state = INITIAL_CRASH_RECOVERY_STATE;
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for (let index = 0; index < CRASH_RECOVERY_MAX_ATTEMPTS; index += 1) {
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state = planCrashRecovery(state, 1_000)!.state;
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}
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const later = 1_000 + CRASH_RECOVERY_WINDOW_MS;
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const plan = planCrashRecovery(state, later);
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expect(plan?.delayMs).toBe(CRASH_RECOVERY_BASE_DELAY_MS);
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expect(plan?.state).toEqual({ attempts: 1, windowStartedAt: later });
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});
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test('crashes inside the window keep counting against the same window', () => {
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const first = planCrashRecovery(INITIAL_CRASH_RECOVERY_STATE, 1_000)!;
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const second = planCrashRecovery(first.state, 1_000 + CRASH_RECOVERY_WINDOW_MS - 1)!;
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expect(second.state.windowStartedAt).toBe(1_000);
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expect(second.state.attempts).toBe(2);
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});
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});
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