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Add ".also" Langauge chain to chai.expect to make test with multi scenarios Promise test case;
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| 'use strict'; | |
| const chai = require('chai'); | |
| const chaiAsPromised = require('chai-as-promised'); | |
| const expectChain = require('./expectChain'); | |
| chai.use(chaiAsPromised); | |
| chai.use(expectChain); | |
| const expect = chai.expect; | |
| describe('Expect Chain test', () => { | |
| const p = () => Promise.resolve({id: 1000, devices: [{id: 1, date: Date.now()}], time: Date.now()}) | |
| it('should success', () => { | |
| let now = Date.now(); | |
| return expect(p()) | |
| .also.eventually.have.deep.property("id", 1000) | |
| .also.eventually.have.deep.property("devices") | |
| .also.eventually.have.deep.property("time") | |
| .that.be.at.least(now) | |
| .exec(); // Must call .exec to execute all promises in chain | |
| }); | |
| }); |
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| module.exports = (chai) => { | |
| // Original | |
| const _expect = chai.expect; | |
| // Create .also able expect | |
| chai.expect = (obj) => { | |
| // This will not work for non Promise Object | |
| if (!obj.toString().match('[object Promise]')) | |
| return _expect(obj); | |
| let chains = [ _expect(obj) ]; | |
| function addAlso(chain) { | |
| Object.defineProperty(chain, "also", { get: () => { | |
| chains.push(_expect(obj)); // Add to Chains | |
| return addAlso(chains[chains.length - 1]).to; | |
| }}); | |
| chain.exec = () => Promise.all(chains); | |
| return chain; | |
| } | |
| return addAlso(chains[0]); | |
| }; | |
| }; |
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