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[READ-ONLY] Mirror of https://github.com/wojtekmaj/async-array-utils. A collection of array-related async utilities.
array array-methods async promise utils
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3.8 kB · 140 lines
JavaScript
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141import asyncEveryStrict from './every_strict';
import { doubleInputArr, getTimer, inputArr, largerThanOneHundred, largerThanOneHundredInRandomTime, makeDelayed, makePushDuplicate, makePushDuplicateInRandomTime,} from '../test-utils';
function largerOrEqualThanZero(x) { return x >= 0;}
function largerOrEqualThanZeroInRandomTime(x) { return new Promise( (resolve) => setTimeout(() => { resolve(x >= 0); }, Math.random() * 100), );}
describe('asyncEvery()', () => { it('example from README works as described', async () => { const indexes = [];
const largerThanZero = await asyncEveryStrict( [1, 2, 3], async (el, index) => { indexes.push(index); return el > 0; }, );
expect(largerThanZero).toBe(true); expect(indexes).toEqual([0, 1, 2]); });
it('takes exactly the time necessary to execute', async () => { const delay = 100;
const timer = getTimer();
timer.start();
await asyncEveryStrict([1, 2, 3], makeDelayed((el) => el > 0, delay));
const timeElapsed = timer.stop();
expect(timeElapsed).toBeGreaterThan(delay * 3); expect(timeElapsed).toBeLessThan((delay + 10) * 3); });
it.skip('assertions below are valid for synchronous .every()', () => { const mapper = jest.fn().mockImplementation(largerOrEqualThanZero);
inputArr.every(mapper);
expect.assertions(1 + inputArr.length);
expect(mapper).toHaveBeenCalledTimes(inputArr.length); inputArr.forEach((el, idx) => { expect(mapper).toHaveBeenCalledWith(el, idx, inputArr); }); });
it('iterates over values properly', async () => { const mapper = jest.fn().mockImplementation(largerOrEqualThanZeroInRandomTime);
await asyncEveryStrict(inputArr, mapper);
expect.assertions(1 + inputArr.length);
expect(mapper).toHaveBeenCalledTimes(inputArr.length); inputArr.forEach((el, idx) => { expect(mapper).toHaveBeenCalledWith(el, idx, inputArr); }); });
it.skip('assertions below are valid for synchronous .every()', () => { const [arr, pushDuplicate] = makePushDuplicate(); const mapper = jest.fn().mockImplementation((el) => { pushDuplicate(el); return largerOrEqualThanZero(el); });
inputArr.every(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(async (el) => { await pushDuplicate(el); return largerOrEqualThanZero(el); });
await asyncEveryStrict(inputArr, mapper);
expect(mapper).toHaveBeenCalledTimes(inputArr.length); expect(arr).toEqual(doubleInputArr); });
it.skip('assertions below are valid for synchronous .every()', () => { const mapper = jest.fn().mockImplementation(largerOrEqualThanZero);
const result = inputArr.every(mapper);
expect(result).toEqual(true); });
it('returns truthy result properly', async () => { const mapper = jest.fn().mockImplementation(largerOrEqualThanZeroInRandomTime);
const result = await asyncEveryStrict(inputArr, mapper);
expect(result).toEqual(true); });
it.skip('assertions below are valid for synchronous .every()', () => { const mapper = jest.fn().mockImplementation(largerThanOneHundred);
const result = inputArr.every(mapper);
expect(result).toEqual(false); });
it('returns falsy result properly', async () => { const mapper = jest.fn().mockImplementation(largerThanOneHundredInRandomTime);
const result = await asyncEveryStrict(inputArr, mapper);
expect(result).toEqual(false); });});