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我有许多想要测试的 React/Redux 操作和减速器。我已经成功编写了一些测试，但是我在减速器测试中遇到了一个问题，其中一个值undefined在第一个测试中被保留，但在第二个测试中正确初始化。

文件Reducers.test.js

import reducer from './filesReducers';
import { filesActions } from '../actions/actionTypes';
import filesInitialState from '../../components/Files/initialState';

describe('files reducers', () => {
  describe('media library reducers', () => {
    it('should return the initial state', () => {
      const testInitialState = reducer(undefined, {});
      console.log({ testInitialState }); /* eslint-disable-line no-console */
      expect(testInitialState.multiMediaMediaLibraryItems).toEqual([]);
      // expect(testInitialState.logosMediaLibraryItems).toEqual([]); /* value is undefined */
      expect(testInitialState.logosMLibraryItems).toEqual([]);
    });
    it('should update the multiMedia list', () => {
      const updatedState = reducer(filesInitialState, { type : filesActions.STORE_MEDIA_LIBRARY_MULTIMEDIA_ITEMS, payload : ['1000002'] });
      console.log(updatedState); /* eslint-disable-line no-console */
      expect(updatedState.multiMediaMediaLibraryItems).toEqual(['1000002']);
    });
  });
});

initialState.js（这里大约有 20 个变量）

const filesInitialState = {
...
  logosMediaLibraryItems           : [],
  logosMLibraryItems               : [],
...

第一个控制台输出片段

  logosMediaLibraryItems: undefined, <=== one variable only undefined
  logosMLibraryItems: [], <=== this and all other variables OK

第二个控制台输出片段

      logosMediaLibraryItems: [], <=== Now this is defined
      logosMLibraryItems: [],

这到底是怎么回事？不久前我看到 reduxForm 有类似的问题，但没有这样的问题。

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