开玩笑的测试错误-始终违规:目标容器不是DOM元素

时间:2018-07-14 10:21:54

标签: reactjs unit-testing jestjs chai enzyme

我是进行单元测试的新手,并且不断收到此错误:

  

永久违反:目标容器不是DOM元素。

     

不变(node_modules / fbjs / lib / invariant.js:42:15)

     

在legacyRenderSubtreeIntoContainer(node_modules / react-dom / cjs / react-dom.development.js:17238:34)

     

在Object.render(node_modules / react-dom / cjs / react-dom.development.js:17317:12)

     

at Object。 (src / client / index.js:243:73)

     

at Object。 (src / client / components / block / Header.js:294:40)

     

at Object。 (src / client / components / block / index.js:123:41)

     

at Object。 (src / client / containers / app.js:195:40)

     

at Object。 (tests / client / containers / App.test.js:13:12)

我认为这与我的app.js的结构方式有关,但不知道为什么...

这是我的App.js:

const App = () => (
  <Box>
    <Router getUserConfirmation={getConfirmation} hashType={'noslash'} basename={'/'}>
      <Box>
        <Route exact path="/" component={Home}/>
        <Route path="/:room" component={Room}/>
      </Box>
    </Router>
  </Box>
)

const mapStateToProps = (state) => {
  return {
    message: state.message
  }
}
export default connect(mapStateToProps, null)(App)

我正在使用jest / enzyme / chai进行单元测试

我的App.test.js:

import { expect } from 'chai'
import React from 'react'
import { shallow } from 'enzyme'
import App from '../../../src/client/containers/app'

jest.mock('react-router')

describe('<App />', () => {
  it('renders without crashing', () => {
    const wrapper = shallow(
      <App/>
    ).dive()
  })
})

package.json中的我的devDependecies:

"devDependencies": {
    "babel-cli": "^6.7.7",
    "babel-core": "^6.7.7",
    "babel-eslint": "^7.2.2",
    "babel-jest": "^23.4.0",
    "babel-loader": "^6.2.4",
    "babel-plugin-__coverage__": "^0.111111.1",
    "babel-preset-env": "^1.7.0",
    "babel-preset-es2015": "^6.6.0",
    "babel-preset-react": "^6.24.1",
    "babel-preset-stage-0": "^6.5.0",
    "babel-watch": "^2.0.2",
    "chai": "^4.1.2",
    "chai-enzyme": "^1.0.0-beta.1",
    "chai-jest-diff": "^1.0.2",
    "chai-jest-snapshot": "^2.0.0",
    "dirty-chai": "^2.0.1",
    "enzyme": "^3.3.0",
    "enzyme-adapter-react-16": "^1.1.1",
    "eslint": "^4.0.0",
    "eslint-plugin-babel": "^3.3.0",
    "eslint-plugin-react": "^7.10.0",
    "jest": "^23.4.1",
    "nyc": "^6.4.4",
    "react-test-renderer": "^16.4.1",
    "redux-devtools-extension": "^2.13.5",
    "webpack": "^1.13.0",
    "webpack-dev-middleware": "^1.6.1",
    "webpack-dev-server": "^1.14.1",
    "webpack-hot-middleware": "^2.10.0"
  },

和我的webpack.config.js:

var path = require('path');

module.exports = {
  entry: './src/client/index.js',

  output: {
    path: path.join(__dirname, 'build'),
    filename: 'bundle.js'
  },
  devServer: {
    compress: true,
    disableHostCheck: true,
  },

  watchOptions: {
    poll: 1000,
    aggregateTimeout:300,
  },

  module: {
    loaders: [{
      test: /\.js$/,
      exclude: /node_modules/,
      loader: 'babel',
      query:{
        presets: ["es2015", "react", "stage-0"]
      }
    }]
  }
};

谢谢您的帮助:)

编辑:

在寻找解决方案时,我注意到在导入组件期间发生错误!它会来自webpack吗?

编辑:

我的错误出在HEADER.JS中,因为我使用persistor来管理用户连接。 我暂时将其删除

1 个答案:

答案 0 :(得分:0)

您要确保id="root"元素上未设置index.html文件中带有body的元素。原因是在脚本完成执行时,document元素尚不可用。

请参阅@Dan Abramov here的答案。