Javascript 当父方法在JEST中抛出错误时，期望子方法抛出错误 在方法注册中，我在模仿 firebase.auth（）.createUserWithEmailAndPassword并使其抛出 错误 因此，现在我希望父方法，即signup也应该抛出，因为signup方法的子方法抛出了一个错误 但是测试用例失败了，我在这里遗漏了什么

App.js

import firebase from 'firebase/app'
import 'firebase/auth'
import './Init'

const App = {
  firebase: firebase,
  signup: async (email, password) => {
    const userCredential = await App.firebase.auth().createUserWithEmailAndPassword(email, password)
    await userCredential.user.sendEmailVerification()
    return `Check your email for verification mail before logging in`
  },
export default App

import myAuthenticationPlugin from 'authenticationPlugin/App'
it('to Throw',async ()=>{
     myAuthenticationPlugin.firebase = {
     auth: jest.fn().mockReturnThis(),
     createUserWithEmailAndPassword: jest.fn(() => {
       throw new Error('Network Error')
     }),
   }
     expect(myAuthenticationPlugin.firebase.auth().createUserWithEmailAndPassword).toThrowError('Network Error')
     expect(await myAuthenticationPlugin.signup).toThrow() // THIS FAILS
    })

应用规范ts

import firebase from 'firebase/app'
import 'firebase/auth'
import './Init'

const App = {
  firebase: firebase,
  signup: async (email, password) => {
    const userCredential = await App.firebase.auth().createUserWithEmailAndPassword(email, password)
    await userCredential.user.sendEmailVerification()
    return `Check your email for verification mail before logging in`
  },
export default App

import myAuthenticationPlugin from 'authenticationPlugin/App'
it('to Throw',async ()=>{
     myAuthenticationPlugin.firebase = {
     auth: jest.fn().mockReturnThis(),
     createUserWithEmailAndPassword: jest.fn(() => {
       throw new Error('Network Error')
     }),
   }
     expect(myAuthenticationPlugin.firebase.auth().createUserWithEmailAndPassword).toThrowError('Network Error')
     expect(await myAuthenticationPlugin.signup).toThrow() // THIS FAILS
    })

错误

 expect(received).toThrow()

    Received function did not throw

      107 |       expect(myAuthenticationPlugin.firebase.auth().createUserWithEmailAndPassword).toThrowError('Network Error')
    > 108 |       expect(await myAuthenticationPlugin.signup).toThrow()
          |                                                   ^
      109 | 
      110 |     })
      111 |   })

---

这有几个问题：

expect(await myAuthenticationPlugin.signup).toThrow() // THIS FAILS

首先，传递给

expect

的参数必须是一个函数，因此这几乎是正确的：

…但它也不起作用。这是因为

.toThrow（）

函数用于检测同步错误抛出，而不是检查拒绝的承诺。您将希望使用“告诉Jest”来打开承诺：

await expect(myAuthenticationPlugin.signup()).rejects.toThrow()

---

感谢您分享您的专业知识，极大地帮助了我，解决了我的问题，并帮助我了解jest如何在内部工作：）非常感谢Jacob@Phil FYI您还可以检查错误消息本身，如：test（'checks the newUserCreated function throws'，async（）=>{//Create a Database snap const snap=testEnv.Database.makeDataSnapshot（{id:testUserId，firstName:'Dan Pralea'，testUserPath）；wait expect（wrapped（snap））.rejects.TothRowerr（'无法读取未定义的属性'make\'）；}）；