105 строки
2.7 KiB
JavaScript
105 строки
2.7 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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* @emails oncall+react_native
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*/
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'use strict';
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// Save these methods so that we can restore them afterward.
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const {freeze, seal, preventExtensions} = Object;
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function setup() {
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jest.setMock('../../vendor/core/_shouldPolyfillES6Collection', () => true);
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jest.unmock('_wrapObjectFreezeAndFriends');
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require('_wrapObjectFreezeAndFriends');
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}
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function cleanup() {
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Object.assign(Object, {freeze, seal, preventExtensions});
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}
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describe('Map polyfill', () => {
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setup();
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const Map = require('Map');
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it('is not native', () => {
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const getCode = Function.prototype.toString.call(Map.prototype.get);
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expect(getCode).not.toContain('[native code]');
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expect(getCode).toContain('getIndex');
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});
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it('should tolerate non-extensible object keys', () => {
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const map = new Map();
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const key = Object.create(null);
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Object.freeze(key);
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map.set(key, key);
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expect(map.size).toBe(1);
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expect(map.has(key)).toBe(true);
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map.delete(key);
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expect(map.size).toBe(0);
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expect(map.has(key)).toBe(false);
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});
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it('should not get confused by prototypal inheritance', () => {
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const map = new Map();
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const proto = Object.create(null);
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const base = Object.create(proto);
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map.set(proto, proto);
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expect(map.size).toBe(1);
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expect(map.has(proto)).toBe(true);
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expect(map.has(base)).toBe(false);
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map.set(base, base);
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expect(map.size).toBe(2);
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expect(map.get(proto)).toBe(proto);
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expect(map.get(base)).toBe(base);
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});
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afterAll(cleanup);
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});
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describe('Set polyfill', () => {
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setup();
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const Set = require('Set');
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it('is not native', () => {
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const addCode = Function.prototype.toString.call(Set.prototype.add);
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expect(addCode).not.toContain('[native code]');
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});
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it('should tolerate non-extensible object elements', () => {
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const set = new Set();
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const elem = Object.create(null);
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Object.freeze(elem);
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set.add(elem);
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expect(set.size).toBe(1);
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expect(set.has(elem)).toBe(true);
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set.add(elem);
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expect(set.size).toBe(1);
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set.delete(elem);
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expect(set.size).toBe(0);
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expect(set.has(elem)).toBe(false);
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});
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it('should not get confused by prototypal inheritance', () => {
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const set = new Set();
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const proto = Object.create(null);
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const base = Object.create(proto);
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set.add(proto);
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expect(set.size).toBe(1);
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expect(set.has(proto)).toBe(true);
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expect(set.has(base)).toBe(false);
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set.add(base);
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expect(set.size).toBe(2);
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expect(set.has(proto)).toBe(true);
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expect(set.has(base)).toBe(true);
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});
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afterAll(cleanup);
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});
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