javascript - 调度程序未在 Jest 单元测试中注册回调

Question

我正在为 react+flux 应用程序中的商店编写单元测试。我遵循了设置模拟调度程序的示例 here ，我的单元测试如下所示:

jest.dontMock "../../app/scripts/stores/item_store.coffee"
jest.dontMock "object-assign"

describe 'ItemStore', ->
  ShopConstants = require "../../app/scripts/constants/shop_constants.coffee"
  ShopDispatcher = undefined
  ItemStore = undefined
  callback = undefined

  actionBuildQueryString =
    source: "VIEW_ACTION"
    action:
      type: ShopConstants.ActionTypes.BUILD_QUERY_STRING
      size: "4"

  actionReceiveFilterRespData =
    source: "SERVER_ACTION"
    action:
      type: ShopConstants.ActionTypes.RECEIVE_FILTER_RESP_DATA
      data: {item: {} }

  beforeEach ->
    ShopConstants = require "../../app/scripts/constants/shop_constants.coffee"
    ShopDispatcher = require "../../app/scripts/dispatchers/shop_dispatcher.coffee"
    ItemStore = require "../../app/scripts/stores/item_store.coffee"
    callback = ShopDispatcher.register.mock.calls[0][0]

  it "registers a callback with the dispatcher", ->
    expect(ShopDispatcher.register.mock.calls.length).toBe(1)

在我的 item_store.coffee 文件中，我这样向调度员注册:

ShopDispatcher.register (payload) ->
  action = payload.action

  switch action.type

    when ActionTypes.BUILD_QUERY_STRING
      WebApiUtils.fetchItems(payload)

    when ActionTypes.RECEIVE_FILTER_RESP_DATA
      _setItems(action.data)

  ItemStore.emitChange()

我希望模拟的 Dispatcher 注册回调，因为这发生在实际的 item_store 文件中，我已经告诉 jest 不要模拟。然而，由于 ShopDispatcher.register 是未定义的，它没有被注册，但我不太清楚为什么。感谢您的帮助。

Answer 1

我也遇到了同样的问题。不要使用 ShopDispatcher.register.mock.calls[0][0] 尝试使用 ShopDispatcher.dispatch。下面的代码非常适合我(使用类型脚本)。

beforeEach(function () {   
    dispatcher = require("../../../src/App/Dispatcher");
    localeStore = require("../../../src/stores/localestore");
    localeAction = require("../../../src/actions/Locale/LocaleAction");
}

it("should translate the element with the value in current locale JSON", function () {
   localeChangeAction = new localeAction(true, locale, localeJson);
   dispatcher.dispatch(localeChangeAction);

   var translatedText = localeStore.instance.TranslateText("login.login-header");
        expect(translatedText).toEqual("Login header");
});