我有一個如下所示的模塊：const config = require('config')const isActive = config.get('isActive')const infoMap = new Map()const set = (key, value) => {  infoMap.set(key, value)}const get = (key) => infoMap.get(key)module.exports={set, get} 以及我測試這些東西的測試：let getlet setbeforeEach(() => {  jest.mock('config')  mockIsActive = require('config').get.mockReturnValueOnce(true)    get = require('../cache/mymap').get  set = require('../cache/mymap').set})describe('The map', () => {  describe('when data is added', () => {    set('testKey', "testData")    it('should contains the data', async () => {      const dataFromMap = get('testKey')      assert("testData", dataFromMap)    })  })})當(dāng)使用以下命令調(diào)用時會失敗set：set is not a function奇怪的是，它get運(yùn)行起來沒有問題。