Javascript 如何在jest测试中重新配置libs？

在

prepareRequestHeaders

I导入

。/redux/storeConfigure

如何使用其他实现重新配置

。/redux/storeConfigure

编辑：

---

像这样的事情应该解决：

/* fetch.js */
import { store } from '../app'

export const prepareRequestHeaders = () => {
  const headers = {
    Accept: 'application/json',
    'Content-Type': 'application/json'
  }

  const { token } = store.getState().auth
  if (token) {
    headers['Authorization'] = `Bearer ${token}`
  }

  return headers
}

/* app.js */

import storeConfigure from './redux/storeConfigure'

export const store = storeConfigure()

/* Directories strucutre */
- redux
  - storeConfigure.js
- api
  - fetch.js
  - api.test.js
app.js

---

当您分配给Jest mock（

Jest.fn（）

）时，您可以随时更改其返回值。它的名字必须以

mock

开头，因为mock-highting

你知道我为什么会有

ReferenceError:mockGetState没有在src/api/api.test.js:4:16

中定义吗？啊，它在提升。。。如果您可以发布一些

fetch.js

和

。/redux/storeConfigure.js

的最低版本，我可以在运行它之后向您粘贴一个完整的示例：）我在上面添加了有问题的代码。提前感谢；）@SimenB^

storeConfigure

只是提供了一个redux存储？

/* fetch.js */
import { store } from '../app'

export const prepareRequestHeaders = () => {
  const headers = {
    Accept: 'application/json',
    'Content-Type': 'application/json'
  }

  const { token } = store.getState().auth
  if (token) {
    headers['Authorization'] = `Bearer ${token}`
  }

  return headers
}

/* app.js */

import storeConfigure from './redux/storeConfigure'

export const store = storeConfigure()

/* Directories strucutre */
- redux
  - storeConfigure.js
- api
  - fetch.js
  - api.test.js
app.js

let mockGetState;

jest.mock('../redux/storeConfigure', () => () => {
  mockGetState = jest.fn().mockReturnValue({ auth: { token: 'TEST_TOKEN' } })
  return { getState: mockGetState }
})

import { prepareRequestHeaders } from './fetch'

describe('prepareRequestHeaders', () => {
  it('returns header with Authorization if token is set', () => {
    expect(prepareRequestHeaders()['Authorization']).toBe('Bearer TEST_TOKEN')
  })

  it('returns header without Authorization if token is not set', () => {
    mockGetState.mockReturnValueOnce({auth: {token: 'SOMETHING_ELSE'}})
    // make your assertion
  })
})