reactjs – Redux警告仅出现在测试中

我正在使用create-react-app.

我有以下商店：

import {createStore,combineReducers} from 'redux';
import gameSettingsReducer from './reducers/gameSettings.js';
import gameStatusReducer from './reducers/gameStatus.js';


const rootReducer = combineReducers({gameSettings: gameSettingsReducer,gameStatus: gameStatusReducer});

export const defaultGameStatus = {
      currentPlayerSymbol: "X",turnNumber: 0,currentView: "start-menu",//one of "start-menu","in-game","game-over"
      winner: "draw",//one of "X","O","draw"
      board: [["E","E","E"],["E","E"]],lastMove: []
};

const store = createStore(rootReducer,{
    gameSettings:{
        playerSymbol: "X","O"
        difficulty: "easy"  //one of "easy","hard"
    },gameStatus: defaultGameStatus
});


export default store;

一切都按照我的预期运行.除了我运行测试(npm test)时,控制台中会出现以下内容：

console.error node_modulesreduxlibutilswarning.js:14
  No reducer provided for key "gameStatus"
console.error node_modulesreduxlibutilswarning.js:14
  Unexpected key "gameStatus" found in preloadedState argument passed to createStore. Expected to find one of the known reducer keys instead: "gameSettings". Unexpected keys will be ignored.

在我的几个测试中,我甚至没有测试商店.所以我想在编译代码时会出现这种情况.
我尝试在根减速器行之前放置console.log(gameStatusReducer).
它表明gameStatusReducer未定义.

由于gameSettingsReducer和gameStatusReducer都以非常相似的方式创建,我不知道这个错误来自哪里,甚至不知道如何进一步调查这个问题.这仅在运行测试时显示.运行应用程序不会显示此问题,应用程序按预期工作.

所以,问题是：

>为什么这只是在测试中出现？
>如何调查问题的来源？