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

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

import { tryUntil } from '../../promise/try-until';
describe('async/promise/try-until', () => {
    beforeAll(() => jest.useFakeTimers());
    afterAll(() => jest.useRealTimers());
    test.each([
        [() => undefined],
        [() => { throw new Error(); }]
    ])('successful ( %s )', (testFn) => {
        const observedFn = jest.fn(testFn);
        const successFn = jest.fn();
        const promise$ = tryUntil(observedFn, 3, 100);
        promise$.then(successFn);
        expect(observedFn).toBeCalled();
        expect(successFn).not.toBeCalled();
        jest.advanceTimersByTime(110);
        expect(observedFn).toBeCalledTimes(2);
        expect(successFn).not.toBeCalled();
        observedFn.mockReturnValue(true);
        jest.advanceTimersByTime(110);
        return expect(promise$).resolves.toBe(true);
    });
    test('failed (() => false)', () => {
        const promise$ = tryUntil(() => false, 3, 100);
        jest.advanceTimersByTime(500);
        return expect(promise$).rejects.toBeTruthy();
    });
});