参考错误：未定义窗口。当我通过 jest 运行 npm test 进行单元测试时出现此错误

Question

参考错误：未定义窗口。当我通过 jest 运行 npm test 进行单元测试时出现此错误。错误来自以下代码导出功能。任何人遇到这种类型的错误并解决了它？

import { createStore, applyMiddleware, compose, combineReducers } from 'redux';
import thunk from 'redux-thunk';

import rootReducer from '../modules/rootReducer';

    export function injectAsyncReducers(asyncReducers) {
  const injectReducers = Object.keys(asyncReducers).reduce((all, item) => {
    if (store.asyncReducers[item]) {
      delete all[item];
    }

    return all;
  }, asyncReducers);

  store.asyncReducers = Object.assign({}, store.asyncReducers, injectReducers);
  replaceReducers(rootReducer);
}

Answer 1

当您没有为 jest 使用正确的 testEnviremoent 配置时，通常会出现此错误，在这种情况下，它应该是jsdom（您可以在此处查看：https : //github.com/tmpvar/jsdom）。您可以在package.json文件中配置它，如下所示：

"jest": {"testEnvironment": "node"}

如果你使用create-react-app，你的测试脚本应该是这样的：

"test": "react-scripts test --env=jsdom"

或者您可以在此处查看 testEviroment 配置的更多选项：https ://facebook.github.io/jest/docs/en/configuration.html#testenvironment-string