unit-testing - 错误:在带有nock和模拟存储的Redux应用程序中的异步操作测试中，操作可能未定义

有点难过这一件事。按照Redux文档为我的异步操作（docs here）设置测试后，出现错误：


  动作可能不是未定义的。 （在调度时（node_modules / redux-mock-store / lib / index.js：35：19））


测试此操作：

export const FETCH_TRANSACTIONS = 'FETCH_TRANSACTIONS'

function fetchTransactionsSuccess (transactions) {
  return {
    type: FETCH_TRANSACTIONS,
    payload: transactions
  }
}

export const fetchTransactions = () => dispatch => axios.get('/api/transactions')
  .then(transactions => dispatch(fetchTransactionsSuccess(transactions)))
  .catch(err => dispatch(handleErr(err)))

这就是测试本身。任何帮助都将是惊人的。凝视了这么久，我的眼睛受伤了。

import configureMockStore from 'redux-mock-store'
import thunk from 'redux-thunk'
import * as actions from '../../client/actions/actionCreators'
import nock from 'nock'
import expect from 'expect'

const middlewares = [ thunk ]
const mockStore = configureMockStore(middlewares)

describe('async actions', () => {
  afterEach(() => {
    nock.cleanAll()
  })

  it('dispatches FETCH_TRANSACTIONS when data is returned', () => {
    nock('http://localhost:3000/')
      .get('/api/transactions')
      .reply(200, [
        {
          "_id": "588900efdf9d3e0905a2d604",
          "amount": 4.50,
          "name": "Cashew Nuts",
          "__v": 0,
          "date": "2017-01-25T00:00:00.000Z",
          "user": "58c2a33cc6cd5a5d15a8fc0c"
        },
        {
          "_id": "58890108df9d3e0905a2d605",
          "amount": 6.25,
          "name": "Monmouth Coffee",
          "__v": 0,
          "date": "2017-01-25T00:00:00.000Z",
          "user": "58c2a33cc6cd5a5d15a8fc0c"
        }
      ])

    const expectedActions = [
      {
        type: actions.FETCH_TRANSACTIONS,
        payload: [
          {
            "_id": "588900efdf9d3e0905a2d604",
            "amount": 4.50,
            "name": "Cashew Nuts",
            "__v": 0,
            "date": "2017-01-25T00:00:00.000Z",
            "user": "58c2a33cc6cd5a5d15a8fc0c"
          },
          {
            "_id": "58890108df9d3e0905a2d605",
            "amount": 6.25,
            "name": "Monmouth Coffee",
            "__v": 0,
            "date": "2017-01-25T00:00:00.000Z",
            "user": "58c2a33cc6cd5a5d15a8fc0c"
          }
        ]
      }
    ]

    const store = mockStore({ transactions: [] })
    console.log(actions)
    return store.dispatch(actions.fetchTransactions())
      .then(() => {
        expect(store.getActions()).toEqual(expectedActions)
      })
  })
})

更新
handleErr函数返回setCurrentUser，这是另一个动作（原始动作通过dispatch调用：

export function handleErr (err) {
  if (err.status === 401 || err.status === 404) {
    localStorage.removeItem('mm-jwtToken')
    setAuthToken(false)
    return setCurrentUser({})
  }
}

最佳答案

有known issue带有axios嘲笑nock请求。因此，我相信您的fetchTransactions动作创建者中的Promise链属于catch子句。请检查您的handleErr函数，它是否返回有效的操作？我敢打赌它返回undefined，这就是为什么您有此错误消息。

关于unit-testing - 错误:在带有nock和模拟存储的Redux应用程序中的异步操作测试中，操作可能未定义，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42961512/