91 lines
2.9 KiB
TypeScript
91 lines
2.9 KiB
TypeScript
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import { expect } from 'chai';
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import { match, stub } from 'sinon';
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import { filterMany, hasItems, lengthOf, toArray } from '../../src/Array';
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describe('list utils', async () => {
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describe('filter many helper', async () => {
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it('should call the predicate with an item from each list', async () => {
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const cb = stub().returns(true);
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const results = filterMany(cb, [1], ['a']);
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expect(results.length).to.equal(1);
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expect(cb).to.have.callCount(1);
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expect(cb).to.have.been.calledWithMatch(match.number, match.string);
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});
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it('should call the predicate for each slice', async () => {
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const data = [1, 2, 3, 4, 5];
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const cb = stub().returns(true);
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const results = filterMany(cb, data);
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expect(results.length).to.equal(data.length);
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expect(cb).to.have.callCount(data.length);
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});
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it('should keep slices that passed the predicate', async () => {
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const data = [1, 2, 3, 4, 5];
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const cb = stub().returns(false);
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const results = filterMany(cb, data);
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expect(results.length).to.equal(0);
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expect(cb).to.have.callCount(data.length);
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});
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});
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describe('to array helper', async () => {
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it('should convert nil values to arrays', async () => {
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/* eslint-disable-next-line no-null/no-null */
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expect(toArray(null)).to.deep.equal([]);
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expect(toArray(undefined)).to.deep.equal([]);
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});
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it('should copy arrays', async () => {
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const data: Array<number> = [];
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const copy = toArray(data);
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expect(copy).not.to.equal(data);
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expect(copy).to.deep.equal(data);
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});
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});
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describe('count list', async () => {
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it('should count a single item', async () => {
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expect(lengthOf(1)).to.equal(1, 'numbers');
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expect(lengthOf('')).to.equal(1, 'empty strings');
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expect(lengthOf('123')).to.equal(1, 'other strings');
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});
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it('should count an array of items', async () => {
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expect(lengthOf([1])).to.equal(1, 'single item list');
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expect(lengthOf([1, 2, 3])).to.equal(3, 'multi item list');
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});
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it('should count an unknown argument as 0', async () => {
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expect(lengthOf(undefined)).to.equal(0, 'undefined');
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// eslint-disable-next-line no-null/no-null
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expect(lengthOf(null)).to.equal(0, 'null');
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});
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});
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describe('has items helper', async () => {
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it('should return false for non-array values', async () => {
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/* eslint-disable @typescript-eslint/no-explicit-any */
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expect(hasItems({} as any)).to.equal(false);
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expect(hasItems(4 as any)).to.equal(false);
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/* eslint-enable @typescript-eslint/no-explicit-any */
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});
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it('should return false for empty arrays', async () => {
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expect(hasItems([])).to.equal(false);
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});
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it('should return true for arrays with elements', async () => {
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expect(hasItems([
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true,
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false,
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])).to.equal(true);
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});
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});
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});
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