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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| /** | ||
| * Run a block with a timeout | ||
| * | ||
| * We can't use the jest timeout feature: | ||
| * | ||
| * - `jest.concurrent()` does not do any concurrency management. It starts all | ||
| * tests at the same time. | ||
| * - Our tests use locking to make sure only one test is running at a time per | ||
| * region. | ||
| * | ||
| * The wait time for the locks is included in the jest test timeout. We therefore | ||
| * need to set it unreasonably high (as long as the last test may need to wait | ||
| * if all tests are executed using only 1 region, and they effectively execute | ||
| * sequentially), which makes it not useful to detect stuck tests. | ||
| * | ||
| * The `withTimeout()` modifier makes it possible to measure only a specific | ||
| * block of code. In our case: the effective test code, excluding the wait time. | ||
| */ | ||
| export function withTimeout<A>(seconds: number, block: (x: A) => Promise<void>) { | ||
| return (x: A) => { | ||
| const timeOut = new Promise<void>((_ok, ko) => { | ||
| const timerHandle = setTimeout( | ||
| () => ko(new Error(`Timeout: test took more than ${seconds}s to complete`)), | ||
| seconds * 1000); | ||
| timerHandle.unref(); | ||
| }); | ||
|
|
||
| return Promise.race([ | ||
| block(x), | ||
| timeOut, | ||
| ]); | ||
| }; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| import { XpMutexPool } from '../lib/xpmutex'; | ||
|
|
||
| const POOL = XpMutexPool.fromName('test-pool'); | ||
|
|
||
| test('acquire waits', async () => { | ||
| const mux = POOL.mutex('testA'); | ||
| let secondLockAcquired = false; | ||
|
|
||
| // Current "process" acquires lock | ||
| const lock = await mux.acquire(); | ||
|
|
||
| // Start a second "process" that tries to acquire the lock | ||
| const secondProcess = (async () => { | ||
| const secondLock = await mux.acquire(); | ||
| try { | ||
| secondLockAcquired = true; | ||
| } finally { | ||
| await secondLock.release(); | ||
| } | ||
| })(); | ||
|
|
||
| // Once we release the lock the second process is free to take it | ||
| expect(secondLockAcquired).toBe(false); | ||
| await lock.release(); | ||
|
|
||
| // We expect the variable to become true | ||
| await waitFor(() => secondLockAcquired); | ||
| expect(secondLockAcquired).toBe(true); | ||
|
|
||
| await secondProcess; | ||
| }); | ||
|
|
||
|
|
||
| /** | ||
| * Poll for some condition every 10ms | ||
| */ | ||
| function waitFor(pred: () => boolean): Promise<void> { | ||
| return new Promise((ok) => { | ||
| const timerHandle = setInterval(() => { | ||
| if (pred()) { | ||
| clearInterval(timerHandle); | ||
| ok(); | ||
| } | ||
| }, 5); | ||
| }); | ||
| } |
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