我正在运行一个Jest测试，由于react-dom找不到文档，因此在设置状态时出错。我在react-dom中放入了一条日志语句，然后看到该文档最初已填充
nsCurrencyPullService但是稍后在测试执行中它为null，这就是我在Jest测试中遇到的错误。
User.createUser(newUser, (err,user) => {
if(err) throw err;
console.log(user);
req.flash('success_msg','u can now log u account is created');
res.redirect('/users/login');
})
错误消息：
console.log node_modules/react-dom/cjs/react-dom.development.js:5066
!!!! Document {
location: [Getter/Setter],
_reactListenersID0002526682692260973: 0 }
App.test.js
console.log node_modules/react-dom/cjs/react-dom.development.js:5066
!!!! null
setupTests.js
console.log src/containers/App.js:266
handleError TypeError: Cannot read property 'body' of null
at getActiveElement (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:5069:16)
at getActiveElementDeep (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:5334:17)
at getSelectionInformation (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:5366:21)
at prepareForCommit (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:8689:26)
at commitRoot (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:17711:3)
at completeRoot (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:19239:3)
at performWorkOnRoot (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:19168:9)
at performWork (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:19076:7)
at performSyncWork (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:19050:3)
at requestWork (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:18919:5)
at scheduleWork (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:18728:5)
at Object.enqueueSetState (/home/jc/projects/grip/grip-client/node_modules/react-dom/cjs/react-dom.development.js:12456:5)
at App.Object.<anonymous>.Component.setState (/home/jc/projects/grip/grip-client/node_modules/react/cjs/react.development.js:375:16)
at setState (/home/jc/projects/grip/grip-client/src/containers/App.js:250:14)
at tryCatcher (/home/jc/projects/grip/grip-client/node_modules/bluebird/js/release/util.js:16:23)
at Promise._settlePromiseFromHandler (/home/jc/projects/grip/grip-client/node_modules/bluebird/js/release/promise.js:512:31)
at Promise._settlePromise (/home/jc/projects/grip/grip-client/node_modules/bluebird/js/release/promise.js:569:18)
at Promise._settlePromiseCtx (/home/jc/projects/grip/grip-client/node_modules/bluebird/js/release/promise.js:606:10)
at _drainQueueStep (/home/jc/projects/grip/grip-client/node_modules/bluebird/js/release/async.js:142:12)
at _drainQueue (/home/jc/projects/grip/grip-client/node_modules/bluebird/js/release/async.js:131:9)
at Async.Object.<anonymous>.Async._drainQueues (/home/jc/projects/grip/grip-client/node_modules/bluebird/js/release/async.js:147:5)
at Immediate.Async.drainQueues [as _onImmediate] (/home/jc/projects/grip/grip-client/node_modules/bluebird/js/release/async.js:17:14)
at runCallback (timers.js:705:18)
at tryOnImmediate (timers.js:676:5)
at processImmediate (timers.js:658:5)