期望承诺解决或拒绝没有适当地失败测试与摩卡和chai

使用Mocha和chai-as-promised，我试图测试我的承诺正在被解决并被正确拒绝。但是chai-as-promise所给出的expect函数并没有正确地导致测试失败。例：

test.js

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
  })
})

当我执行mocha test.js时：

  foo
    ✓ resolve expected
    ✓ resolve unexpected
(node:2659) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): AssertionError: expected promise to be rejected but it was fulfilled with undefined
(node:2659) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
    ✓ reject expected
    ✓ reject unexpected
(node:2659) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 4): AssertionError: expected promise to be fulfilled but it was rejected with undefined


  4 passing (10ms)

您可以看到断言错误似乎被抛出，但摩卡不会接受它们。如何让摩卡识别失败？

正如我们确认的那样，并且为了将来参考，问题是您没有在每个测试中返回断言。

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在最终返回时打印出“未处理”的承诺。 return关键字通知mocha等待异步函数解析/拒绝。

期望承诺解决或拒绝没有适当地失败测试与摩卡和chai

使用Mocha和chai-as-promised，我试图测试我的承诺正在被解决并被正确拒绝。但是chai-as-promise所给出的expect函数并没有正确地导致测试失败。例：

test.js

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
  })
})

当我执行mocha test.js时：

  foo
    ✓ resolve expected
    ✓ resolve unexpected
(node:2659) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): AssertionError: expected promise to be rejected but it was fulfilled with undefined
(node:2659) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
    ✓ reject expected
    ✓ reject unexpected
(node:2659) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 4): AssertionError: expected promise to be fulfilled but it was rejected with undefined


  4 passing (10ms)

您可以看到断言错误似乎被抛出，但摩卡不会接受它们。如何让摩卡识别失败？

正如我们确认的那样，并且为了将来参考，问题是您没有在每个测试中返回断言。

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在最终返回时打印出“未处理”的承诺。 return关键字通知mocha等待异步函数解析/拒绝。