appium-test-support

import { fakeTime } from 'appium-test-support'; import sinon from 'sinon'; // Requires 'sinon' as a dev dependency import { expect } from 'chai'; // Requires 'chai' for assertions // Simplified Promise-like object for demonstration if Bluebird isn't available class CustomPromise { constructor(executor) { this.resolve = null; this.reject = null; const promise = new Promise((res, rej) => { this.resolve = res; this.reject = rej; }); executor(this.resolve, this.reject); return promise; } } function doSomethingThatTakesTime() { return new CustomPromise((resolve) => { let ret = ''; function appendOneByOne () { if(ret.length >= 10) { return resolve(ret); } setTimeout(() => { ret = ret + ret.length; appendOneByOne(); }, 1000); } appendOneByOne(); }); } describe('fakeTime demonstration', () => { let sandbox: sinon.SinonSandbox; beforeEach(() => { sandbox = sinon.createSandbox(); }); afterEach(() => { sandbox.restore(); }); it('should fast-forward time to test async operations', async () => { const timeLord = fakeTime(sandbox); const p = doSomethingThatTakesTime(); // Simulate 60 intervals of 200ms each, effectively advancing 12000ms (12 seconds) // This allows the `doSomethingThatTakesTime` function to complete its 10 * 1000ms operations. timeLord.speedup(200, 60); expect(await p).to.equal('0123456789'); }); });