javascript - TypeError:无法读取未定义的属性 'calls'

我正在尝试在React应用程序中为我的商店编写单元测试。
单元测试如下:

import FRIENDS from '../../constants/friends';
import FriendsStore from '../friends_store';

jest.dontMock('../../constants/friends');
jest.dontMock('../friends_store');

describe('FriendsStore', () => {

    let AppDispatcher;
    let callback;

    let addFriends = {
        actionType: FRIENDS.ADD_FRIENDS,
        name: 'Many'
    };

    let removeFriend = {
        actionType: FRIENDS.REMOVE_FRIENDS,
        id: '3'
    };

    beforeEach(function () {
        AppDispatcher = require('../../dispatcher/app_dispatcher');
        callback = AppDispatcher.register.mock.calls[0][0];
    });

    it('Should initialize with no friends items', function () {
        var all = FriendsStore.getAll();
        expect(all).toEqual([]);
    });


});

当我使用jest语句执行时，我得到了错误消息:

Using Jest CLI v0.4.0
 FAIL  scripts/stores/__tests__/friends_store-test.js (0.811s)
● FriendsStore › it Should initialize with no friends items
  - TypeError: Cannot read property 'calls' of undefined
        at Spec.<anonymous> (/Volumes/Developer/reactjs/app5/scripts/stores/__tests__/friends_store-test.js:33:41)
        at jasmine.Block.execute (/Volumes/Developer/reactjs/app5/node_modules/jest-cli/vendor/jasmine/jasmine-1.3.0.js:1065:17)
        at jasmine.Queue.next_ (/Volumes/Developer/reactjs/app5/node_modules/jest-cli/vendor/jasmine/jasmine-1.3.0.js:2098:31)
        at null._onTimeout (/Volumes/Developer/reactjs/app5/node_modules/jest-cli/vendor/jasmine/jasmine-1.3.0.js:2088:18)
        at Timer.listOnTimeout [as ontimeout] (timers.js:112:15)
1 test failed, 0 tests passed (1 total)
Run time: 1.028s

似乎是，开 Jest 找不到calls属性。我究竟做错了什么？

最佳答案

我有一个类似的问题。

进行以下更改应该可以解决此问题:

beforeEach(function () {
   AppDispatcher = require('../../dispatcher/app_dispatcher');
   FriendsStore = require('/path/to/store'); //**load in store**
   callback = AppDispatcher.register.mock.calls[0][0];
});

使用ReactJS v15.2.1和Jest v14.0.0
这也适用于ReactJS v14。

关于javascript - TypeError:无法读取未定义的属性 'calls'，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30060112/