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qew.test.ts
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qew.test.ts
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import * as sinon from "@sinonjs/fake-timers";
import { Qew } from "./qew";
const callAfter = (ms: number, cb: () => void) =>
new Promise((res) => setTimeout(() => res(cb()), ms));
/**
* Because Jest's fake timers are accursed and we shall never speak of them again.
*/
let clock: sinon.InstalledClock;
const advanceClock = async (ms: number) => clock.tickAsync(ms);
beforeAll(() => {
clock = sinon.install();
});
beforeEach(() => {
clock.reset();
});
afterAll(() => {
clock.uninstall();
});
it("Test that qew can run a single function", async () => {
const qew = new Qew();
const fn = jest.fn(() => 1);
const oneSecFunc = () => callAfter(1000, fn);
const prom = qew.push(oneSecFunc);
expect(fn).toHaveBeenCalledTimes(0);
await advanceClock(999);
expect(fn).toHaveBeenCalledTimes(0);
await advanceClock(1);
expect(fn).toHaveBeenCalledTimes(1);
await advanceClock(1000);
expect(fn).toHaveBeenCalledTimes(1);
expect(prom).resolves.toBe(1);
});
it("Test singlethreaded qew with a delay", async () => {
const qew = new Qew(1, 500);
const fn1 = jest.fn(() => 1);
const fn2 = jest.fn(() => 2);
const prom1 = qew.push(() => callAfter(1000, fn1));
const prom2 = qew.push(() => callAfter(1000, fn2));
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(0);
await advanceClock(999);
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(0);
await advanceClock(1);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(0);
await advanceClock(500);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(0);
await advanceClock(999);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(0);
await advanceClock(1);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
await advanceClock(5000);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(prom1).resolves.toBe(1);
expect(prom2).resolves.toBe(2);
});
it("Test qew with max concurrent tasks of 2 and no delay", async () => {
const qew = new Qew(2);
const fn1 = jest.fn(() => 1);
const fn2 = jest.fn(() => 2);
const fn3 = jest.fn(() => 3);
const fn4 = jest.fn(() => 4);
const prom1 = qew.push(() => callAfter(1000, fn1));
const prom2 = qew.push(() => callAfter(1000, fn2));
const prom3 = qew.push(() => callAfter(1000, fn3));
const prom4 = qew.push(() => callAfter(1000, fn4));
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(0);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(999);
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(0);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(1);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(999);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
// Hmm this is odd. 1ms should definitely be enough but maybe internally the promises need extra 1ms to resolve? Idk.
await advanceClock(2);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(1);
expect(fn4).toHaveBeenCalledTimes(1);
await advanceClock(5000);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(1);
expect(fn4).toHaveBeenCalledTimes(1);
expect(prom1).resolves.toBe(1);
expect(prom2).resolves.toBe(2);
expect(prom3).resolves.toBe(3);
expect(prom4).resolves.toBe(4);
});
it("Test qew with max concurrent tasks of 2 and a delay", async () => {
const qew = new Qew(2, 500);
const fn1 = jest.fn(() => 1);
const fn2 = jest.fn(() => 2);
const fn3 = jest.fn(() => 3);
const fn4 = jest.fn(() => 4);
const prom1 = qew.push(() => callAfter(1000, fn1));
const prom2 = qew.push(() => callAfter(1000, fn2));
const prom3 = qew.push(() => callAfter(1000, fn3));
const prom4 = qew.push(() => callAfter(1000, fn4));
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(0);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(999);
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(0);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(1);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(1499);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(1);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(1);
expect(fn4).toHaveBeenCalledTimes(1);
await advanceClock(5000);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(1);
expect(fn4).toHaveBeenCalledTimes(1);
expect(prom1).resolves.toBe(1);
expect(prom2).resolves.toBe(2);
expect(prom3).resolves.toBe(3);
expect(prom4).resolves.toBe(4);
});
it("Test qew with max concurrent tasks of 3, a delay and functions that run for different amounts of time", async () => {
const qew = new Qew(3, 100);
const fn1 = jest.fn(() => 1);
const fn2 = jest.fn(() => 2);
const fn3 = jest.fn(() => 3);
const fn4 = jest.fn(() => 4);
const prom1 = qew.push(() => callAfter(1000, fn1));
const prom2 = qew.push(() => callAfter(100, fn2));
const prom3 = qew.push(() => callAfter(800, fn3));
const prom4 = qew.push(() => callAfter(300, fn4));
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(0);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(100);
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(0);
await advanceClock(400);
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(0);
expect(fn4).toHaveBeenCalledTimes(1);
await advanceClock(300);
expect(fn1).toHaveBeenCalledTimes(0);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(1);
expect(fn4).toHaveBeenCalledTimes(1);
await advanceClock(200);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(1);
expect(fn4).toHaveBeenCalledTimes(1);
await advanceClock(5000);
expect(fn1).toHaveBeenCalledTimes(1);
expect(fn2).toHaveBeenCalledTimes(1);
expect(fn3).toHaveBeenCalledTimes(1);
expect(fn4).toHaveBeenCalledTimes(1);
expect(prom1).resolves.toBe(1);
expect(prom2).resolves.toBe(2);
expect(prom3).resolves.toBe(3);
expect(prom4).resolves.toBe(4);
});