-
-
Notifications
You must be signed in to change notification settings - Fork 174
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
unify usage of sleepAsync and add tests
The tests mock JS setTimeout API. However promise.resolve() is not working without flushing the promise queue (which could be done just by awaiting Promise.resolve()), similar issue has been discussed in jestjs/jest#2157.
- Loading branch information
1 parent
49600c5
commit 36f0805
Showing
4 changed files
with
88 additions
and
4 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,5 @@ | ||
export type SchedulerType = (callback: (...args: any[]) => void, ms: number) => void; | ||
|
||
export function sleepAsync(time: number, scheduler: SchedulerType = setTimeout) { | ||
return new Promise((resolve) => scheduler(() => resolve(undefined), time)); | ||
} |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,79 @@ | ||
import 'mocha'; | ||
import { expect } from 'chai'; | ||
import { sleepAsync, SchedulerType } from '@/infrastructure/Threading/AsyncSleep'; | ||
|
||
describe('AsyncSleep', () => { | ||
it('fulfills after delay', async () => { | ||
// arrange | ||
const delayInMs = 10; | ||
const scheduler = new SchedulerMock(); | ||
// act | ||
const sleep = sleepAsync(delayInMs, scheduler.mock); | ||
const promiseState = watchPromiseState(sleep); | ||
scheduler.tickNext(delayInMs); | ||
await flushPromiseResolutionQueue(); | ||
// assert | ||
const actual = promiseState.isFulfilled(); | ||
expect(actual).to.equal(true); | ||
}); | ||
it('pending before delay', async () => { | ||
// arrange | ||
const delayInMs = 10; | ||
const scheduler = new SchedulerMock(); | ||
// act | ||
const sleep = sleepAsync(delayInMs, scheduler.mock); | ||
const promiseState = watchPromiseState(sleep); | ||
scheduler.tickNext(delayInMs / 5); | ||
await flushPromiseResolutionQueue(); | ||
// assert | ||
const actual = promiseState.isPending(); | ||
expect(actual).to.equal(true); | ||
}); | ||
}); | ||
|
||
function flushPromiseResolutionQueue() { | ||
return Promise.resolve(); | ||
} | ||
|
||
class SchedulerMock { | ||
public readonly mock: SchedulerType; | ||
private currentTime = 0; | ||
private scheduledActions = new Array<{time: number, action: (...args: any[]) => void}>(); | ||
constructor() { | ||
this.mock = (callback: (...args: any[]) => void, ms: number) => { | ||
this.scheduledActions.push({ time: this.currentTime + ms, action: callback }); | ||
}; | ||
} | ||
public tickNext(ms: number) { | ||
const newTime = this.currentTime + ms; | ||
let newActions = this.scheduledActions; | ||
for (const action of this.scheduledActions) { | ||
if (newTime >= action.time) { | ||
newActions = newActions.filter((a) => a !== action); | ||
action.action(); | ||
} | ||
} | ||
this.scheduledActions = newActions; | ||
} | ||
} | ||
|
||
function watchPromiseState<T>(promise: Promise<T>) { | ||
let isPending = true; | ||
let isRejected = false; | ||
let isFulfilled = false; | ||
promise.then( | ||
() => { | ||
isFulfilled = true; | ||
isPending = false; | ||
}, | ||
() => { | ||
isRejected = true; | ||
isPending = false; | ||
}, | ||
); | ||
return { | ||
isFulfilled: () => isFulfilled, | ||
isPending: () => isPending, | ||
isRejected: () => isRejected, | ||
}; | ||
} |