@exadel/esl/modules/esl-utils/async/test/promise/timeout.test.js

Exadel Smart Library (ESL) is the lightweight custom elements library that provide a set of super-flexible components

import { promisifyTimeout } from '../../promise/timeout';
describe('async/promise/timeout', () => {
    beforeAll(() => jest.useFakeTimers());
    afterAll(() => jest.useRealTimers());
    test('promisifyTimeout resolves without payload', () => {
        const promise$ = promisifyTimeout(100);
        jest.advanceTimersByTime(100);
        return expect(promise$).resolves.toBeUndefined();
    });
    test('promisifyTimeout resolves', () => {
        const promise$ = promisifyTimeout(100, true);
        jest.advanceTimersByTime(100);
        return expect(promise$).resolves.toBe(true);
    });
    test('promisifyTimeout rejects', () => {
        const promise$ = promisifyTimeout(100, false, true);
        jest.advanceTimersByTime(100);
        return expect(promise$).rejects.toBe(false);
    });
    test('promisifyTimeout handles timeout correctly', () => {
        const resCb = jest.fn();
        const rejCb = jest.fn();
        const promise$ = promisifyTimeout(100, true);
        promise$.then(resCb, rejCb);
        jest.advanceTimersByTime(50);
        expect(resCb).not.toBeCalled();
        expect(rejCb).not.toBeCalled();
        jest.advanceTimersByTime(100);
    });
});