Javascript 常量不可用于操作中的jest测试

当我在下面运行navAction-test.js时，我得到以下错误：TypeError:无法读取未定义的

据我所知，加载的常量.DATA_是未定义的，我猜jest是在嘲笑它，出于这个原因，常量是未定义的，我在下一个版本中尝试了我能找到的一切，但它仍然未定义

有人能帮忙吗。我会非常感激的

navAction.js：

var dispatcher = require('../dispatcher/AppDispatcher');
var constants = require('../constants/constants');

module.exports = {

    load: function() {
    def = $.ajax({
        url: 'http://api.facebook.com/',
        data: {},
        success: function (data, textStatus, jqXHR) {
            dispatcher.dispatch({type: constants.DATA_LOADED, data: data});
        }
    });
    }
}

navAction-test.js：

jest.dontMock('../navAction.js');

describe('Tests NavigationCollectionActionCreators', function() {

    var $;
    var dispatcher;
    var navAction;

    beforeEach(function() {
    $ = require('jquery');
    dispatcher = require('../../dispatcher/AppDispatcher');
    navAction  = require('../navAction.js');
    });

    it('tests calls $.ajax & dispatcher ', function () {
    navAction.load();
    $.ajax.mock.calls[0][0].success({body: {header: {items: [{name: 'The name', link: 'http://www.facebook.com'}]}}});

    expect(dispatcher.dispatch).toBeCalledWith({type: 'DATA_LOADED', data: [{name: 'The name', link: 'http://www.timeout.com'}]});
    });

});

//constants.js
var keyMirror = require('keymirror');

module.exports = keyMirror({
    DATA_LOADED: null,
});

var constants = {
    DATA_LOADED: 'DATA_LOADED',
    DATA_NOT_LOADED: 'DATA_NOT_LOADED'
};
jest.setMock('../../constants/constants', constants);

更新：

我通过在navAction-test.js中添加以下内容实现了这一点：

jest.dontMock('../navAction.js');

describe('Tests NavigationCollectionActionCreators', function() {

    var $;
    var dispatcher;
    var navAction;

    beforeEach(function() {
    $ = require('jquery');
    dispatcher = require('../../dispatcher/AppDispatcher');
    navAction  = require('../navAction.js');
    });

    it('tests calls $.ajax & dispatcher ', function () {
    navAction.load();
    $.ajax.mock.calls[0][0].success({body: {header: {items: [{name: 'The name', link: 'http://www.facebook.com'}]}}});

    expect(dispatcher.dispatch).toBeCalledWith({type: 'DATA_LOADED', data: [{name: 'The name', link: 'http://www.timeout.com'}]});
    });

});

//constants.js
var keyMirror = require('keymirror');

module.exports = keyMirror({
    DATA_LOADED: null,
});

var constants = {
    DATA_LOADED: 'DATA_LOADED',
    DATA_NOT_LOADED: 'DATA_NOT_LOADED'
};
jest.setMock('../../constants/constants', constants);

这是正确的方法吗？

添加到测试：

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

如果您根本不想使用自动模拟，您可以删除所有的

jest.dontMock

，然后放置：

jest.autoMockOff();

---

我认为你解决问题的方法（在底部的更新中）不合适，因为它违反了DRY（不要重复你自己）。添加另一个动作常量时会发生什么？现在，您必须记住在测试中也添加它。这是有问题的。

我已经更新了上面的代码块，添加了所需的常量