模拟内部axios.create()

Question

我使用jest和axios-mock-adapter来测试redux异步操作创建器中的axios API调用。

当我使用用axios创建的axios.create()实例时，我无法使它们工作：

import axios from 'axios';

const { REACT_APP_BASE_URL } = process.env;

export const ajax = axios.create({
  baseURL: REACT_APP_BASE_URL,
});

我会在我的async action creator中使用它，比如：

import { ajax } from '../../api/Ajax'

export function reportGet(data) {
  return async (dispatch, getState) => {
    dispatch({ type: REQUEST_TRANSACTION_DATA })

    try {
      const result = await ajax.post(
         END_POINT_MERCHANT_TRANSACTIONS_GET,
         data,
      )
      dispatch({ type: RECEIVE_TRANSACTION_DATA, data: result.data })
      return result.data
    } catch (e) {
      throw new Error(e);
    }
  }
}

这是我的测试文件：

import {
  reportGet,
  REQUEST_TRANSACTION_DATA,
  RECEIVE_TRANSACTION_DATA,
} from '../redux/TransactionRedux'
import configureMockStore from 'redux-mock-store'
import thunk from 'redux-thunk'
import { END_POINT_MERCHANT_TRANSACTIONS_GET } from 'src/utils/apiHandler'
import axios from 'axios'
import MockAdapter from 'axios-mock-adapter'

const middlewares = [thunk]
const mockStore = configureMockStore(middlewares)
const store = mockStore({ transactions: {} })

test('get report data', async () => {
  let mock = new MockAdapter(axios)

  const mockData = {
    totalSalesAmount: 0
  }

  mock.onPost(END_POINT_MERCHANT_TRANSACTIONS_GET).reply(200, mockData)

  const expectedActions = [
    { type: REQUEST_TRANSACTION_DATA },
    { type: RECEIVE_TRANSACTION_DATA, data: mockData },
  ]

  await store.dispatch(reportGet())
  expect(store.getActions()).toEqual(expectedActions)
})

我只得到一个动作Received: [{"type": "REQUEST_TRANSACTION_DATA"}]，因为ajax.post出错了。

我已经尝试过许多方法来嘲弄axios.create，但在不真正知道我是什么的情况下，doing..Any帮助是值得赞赏的。

Answer 1

好的我知道了。我就是这么修好的！最后，我在没有的情况下做了--任何axios的模拟库！

在axios中为src/__mocks__创建一个模拟

// src/__mocks__/axios.ts

const mockAxios = jest.genMockFromModule('axios')

// this is the key to fix the axios.create() undefined error!
mockAxios.create = jest.fn(() => mockAxios)

export default mockAxios

然后，在您的测试文件中，gist看起来如下所示：

import mockAxios from 'axios'
import configureMockStore from 'redux-mock-store'
import thunk from 'redux-thunk'

// for some reason i need this to fix reducer keys undefined errors..
jest.mock('../../store/rootStore.ts')

// you need the 'async'!
test('Retrieve transaction data based on a date range', async () => {
  const middlewares = [thunk]
  const mockStore = configureMockStore(middlewares)
  const store = mockStore()

  const mockData = {
    'data': 123
  }

  /** 
   *  SETUP
   *  This is where you override the 'post' method of your mocked axios and return
   *  mocked data in an appropriate data structure-- {data: YOUR_DATA} -- which
   *  mirrors the actual API call, in this case, the 'reportGet'
   */
  mockAxios.post.mockImplementationOnce(() =>
    Promise.resolve({ data: mockData }),
  )

  const expectedActions = [
    { type: REQUEST_TRANSACTION_DATA },
    { type: RECEIVE_TRANSACTION_DATA, data: mockData },
  ]

  // work
  await store.dispatch(reportGet())

  // assertions / expects
  expect(store.getActions()).toEqual(expectedActions)
  expect(mockAxios.post).toHaveBeenCalledTimes(1)
})

Answer 2

如果您需要创建Jest测试，它在特定的测试中用create来模拟axios (并且不需要所有测试用例的模拟公理，就像其他答案中提到的那样)，您也可以使用：

const axios = require("axios");

jest.mock("axios");

beforeAll(() => {
    axios.create.mockReturnThis();
});

test('should fetch users', () => {
    const users = [{name: 'Bob'}];
    const resp = {data: users};
    axios.get.mockResolvedValue(resp);

    // or you could use the following depending on your use case:
    // axios.get.mockImplementation(() => Promise.resolve(resp))

    return Users.all().then(data => expect(data).toEqual(users));
});

下面是指向没有笑中嬉戏的create的相同示例的链接。不同之处在于添加axios.create.mockReturnThis()

Answer 3

这里是我对axios的模拟

export default {
    defaults:{
        headers:{
            common:{
                "Content-Type":"",
                "Authorization":""
            }
        }
  },
  get: jest.fn(() => Promise.resolve({ data: {} })),
  post: jest.fn(() => Promise.resolve({ data: {} })),
  put: jest.fn(() => Promise.resolve({ data: {} })),
  delete: jest.fn(() => Promise.resolve({ data: {} })),
  create: jest.fn(function () {
      return {
          interceptors:{
              request : {  
                  use: jest.fn(() => Promise.resolve({ data: {} })),
              }
          },

          defaults:{
                headers:{
                    common:{
                        "Content-Type":"",
                        "Authorization":""
                    }
                }
          },
          get: jest.fn(() => Promise.resolve({ data: {} })),
          post: jest.fn(() => Promise.resolve({ data: {} })),
          put: jest.fn(() => Promise.resolve({ data: {} })),
          delete: jest.fn(() => Promise.resolve({ data: {} })),
      }
  }),
};