某些值在第一次测试中未初始化

如何解决某些值在第一次测试中未初始化

我有很多要测试的React / Redux动作和reducer。我已经成功编写了一些测试，但是在化简测试中遇到了一个问题，在第一个测试中，一个值保留为undefined，但在第二个测试中已正确初始化。

filesReducers.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 （此处大约有20个变量）

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

第一个控制台输出代码段

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

第二个控制台输出代码段

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

这到底是怎么回事？不久前，我看到reduxForm存在类似的问题，但是没有这样的问题。