柴最终错误地通过

Question

为什么with表示的测试最终通过了？我显然在语法或用例中遗漏了一些东西。

const chai = require('chai')
const chaiAsPromised = require("chai-as-promised");
chai.use(chaiAsPromised);
const {expect} = chai

function p() {
  return new Promise( (resolve) => {
    setTimeout( () => {
      resolve(10);
    },5000);
  })
}

describe('Chai Eventually test', () => {
  it('should fail!', () => {
    expect(p()).to.eventually.equal(5)
  });
  it('should also fail!', async () => {
    expect(await p()).to.equal(5)
  });
})

运行它与 mocha 我得到：

Chai Eventually test
    ✔ should fail!
    1) should also fail!


  1 passing (2s)
  1 failing

  1) Chai Eventually test
       should also fail!:

      AssertionError: expected 10 to equal 5
      + expected - actual

      -10
      +5
      
      at Context.<anonymous> (chaiError.js:19:26)    
    
      1 passing (4ms)

这会立即发生，因此不会等待 promise 解决。

Answer 1

这里有几个选项。

最简单的就是 return expect:

it('should fail!', () => {
  return expect(p()).to.eventually.equal(5); // <-- return this expectation
});

或者，您可以跳过 return 并使用传递给 chai 的 .notify 方法的 done 回调：

it('should fail using done!', (done) => { // <-- pass done into spec function
  expect(p()).to.eventually.equal(5).notify(done); // <-- pass done to .notify()
});

Documentation here.

并且 here's a StackBlitz 显示它在这些更改下正常工作（即失败）。

柴最终错误地通过

Chai eventually erroneously passing

javascript

unit-testing

node.js

chai