Question

使用Mocha和chai-as-promised，我正在尝试测试我的承诺是否得到妥善解决和拒绝。但是chai-as-promise给出的cron: - description: "Lead Data Update" url: /cronjobPrivate/processLeads schedule: every 1 minutes函数没有正确地导致测试失败。例如：

test.js

expect

执行const chai = require('chai') chai.use(require('chai-as-promised')) const expect = chai.expect describe('foo', () => { it('resolve expected', () => { expect(new Promise((res,rej) => {res()})).to.be.fulfilled }) it('resolve unexpected', () => { expect(new Promise((res,rej) => {res()})).to.be.rejected }) it('reject expected', () => { expect(new Promise((res,rej) => {rej()})).to.be.rejected }) it('reject unexpected', () => { expect(new Promise((res,rej) => {rej()})).to.be.fulfilled }) })时：

mocha test.js

你可以看到断言错误似乎被抛出，但是mocha不会接受它们。如何让摩卡识别失败？

Answer 1

正如我们确认的，以及将来的参考，问题是你没有在每次测试中返回断言。

it('reject expected', () => {
  return expect(new Promise((res,rej) => {rej()})).to.be.rejected
})
it('reject unexpected', () => {
  return expect(new Promise((res,rej) => {rej()})).to.be.fulfilled
})

这就是为什么测试通过但后来打印了一个＆＃34;未处理的＆＃34;当它最终回归时承诺。 return关键字通知mocha等待异步函数解析/拒绝。

Answer 2

或者使用chai-as-promised库，您可以尝试使用chai.should并调用.notify来指示其“已完成”。像这样：

const chai = require('chai');
chai.use(require('chai-as-promised'));
chai.should();

const expect = chai.expect;

describe('foo', () => {
    it('resolve expected', () => {
        expect(new Promise((res, rej) => { res(); })).to.be.fulfilled;
    });
    it('resolve unexpected', (done) => {
        // expect(new Promise((res, rej) => { res(); })).to.be.rejected;
        new Promise((res, rej) => { res(); }).should.be.rejected.and.notify(done);
    });
    it('reject expected', (done) => {
        // expect(new Promise((res, rej) => { rej(); })).to.be.rejected;
        new Promise((res, rej) => { rej(); }).should.be.rejected.and.notify(done);
    });
    it('reject unexpected', (done) => {
        // expect(new Promise((res, rej) => { rej(); })).to.be.fulfilled;
        new Promise((res, rej) => { rej(); }).should.be.fulfilled.and.notify(done);
    });
});

这样mocha将识别测试失败：

foo
    √ resolve expected
    1) resolve unexpected
    √ reject expected
    2) reject unexpected


  2 passing (37ms)   2 failing

  1) foo
       resolve unexpected:
     AssertionError: expected promise to be rejected but it was fulfilled with undefined


  2) foo
       reject unexpected:
     AssertionError: expected promise to be fulfilled but it was rejected with undefined

检查chai-as-promised doc以获取进一步参考here

期望承诺解决或拒绝没有适当地失败测试与摩卡和chai-as-promise

2 个答案: