Something went wrong. Try again.
[READ-ONLY] Mirror of https://github.com/wojtekmaj/async-array-utils. A collection of array-related async utilities.
array array-methods async promise utils
Something went wrong. Try again.
3.2 kB · 112 lines
JavaScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113import asyncForEachStrict from './forEach_strict';import { doubleInputArr, getTimer, inputArr, makeDelayed, makePushDuplicate, makePushDuplicateInRandomTime,} from '../test-utils';
describe('asyncForEachStrict()', () => { it('example from README works as described', async () => { const consoleLog = jest.fn(); const indexes = [];
await asyncForEachStrict( [1, 2, 3], async (el, index) => { indexes.push(index); consoleLog(el * 2); }, );
expect(consoleLog).toHaveBeenCalledTimes(3); expect(consoleLog).toHaveBeenCalledWith(2); expect(consoleLog).toHaveBeenCalledWith(4); expect(consoleLog).toHaveBeenCalledWith(6);
expect(indexes).toEqual([0, 1, 2]); });
it('takes exactly the time necessary to execute', async () => { const delay = 100;
const timer = getTimer();
timer.start();
await asyncForEachStrict([1, 2, 3], makeDelayed((el) => el * 2, delay));
const timeElapsed = timer.stop();
expect(timeElapsed).toBeGreaterThan(delay * 3); expect(timeElapsed).toBeLessThan((delay + 10) * 3); });
it.skip('assertions below are valid for synchronous .forEach()', () => { const [arr, pushDuplicate] = makePushDuplicate(); const mapper = jest.fn().mockImplementation(pushDuplicate);
inputArr.forEach(mapper);
expect.assertions(1 + inputArr.length);
expect(mapper).toHaveBeenCalledTimes(inputArr.length); inputArr.forEach((el) => { expect(arr).toContain(el * 2); }); });
it('iterates through an array properly', async () => { const [arr, pushDuplicate] = makePushDuplicateInRandomTime(); const mapper = jest.fn().mockImplementation(pushDuplicate);
await asyncForEachStrict(inputArr, mapper);
expect.assertions(1 + inputArr.length);
expect(mapper).toHaveBeenCalledTimes(inputArr.length); inputArr.forEach((el) => { expect(arr).toContain(el * 2); }); });
it.skip('assertions below are valid for synchronous .forEach()', () => { const [arr, pushDuplicate] = makePushDuplicate(); const mapper = jest.fn().mockImplementation(pushDuplicate);
inputArr.forEach(mapper);
expect(mapper).toHaveBeenCalledTimes(inputArr.length); expect(arr).toEqual(doubleInputArr); });
it('iterates through an array properly with side effects', async () => { const [arr, pushDuplicate] = makePushDuplicateInRandomTime(); const mapper = jest.fn().mockImplementation(pushDuplicate);
await asyncForEachStrict(inputArr, mapper);
expect(mapper).toHaveBeenCalledTimes(inputArr.length); expect(arr).toEqual(doubleInputArr); });
it.skip('assertions below are valid for synchronous .forEach()', () => { const [, pushDuplicate] = makePushDuplicate(); const mapper = jest.fn().mockImplementation(pushDuplicate);
const result = inputArr.forEach(mapper);
expect(result).toBe(undefined); });
it('returns undefined', async () => { const [, pushDuplicate] = makePushDuplicateInRandomTime(); const mapper = jest.fn().mockImplementation(pushDuplicate);
const result = await asyncForEachStrict(inputArr, mapper);
expect(result).toBe(undefined); });});