Jest Error反应组件

Question

我在React Component Name运行npm test时收到了意外的令牌。尝试阅读其他几个类似的问题但似乎没有一个对我有用。我在

下添加了babelrc，package.json和我的测试文件内容的内容

<!-- content of .babelrc file -->
{ "presets": ["env"] }

<!-- content of package.son file -->
  "dependencies": {
    "react": "^16.2.0",
    "react-bootstrap": "^0.32.1",
    "react-dom": "^16.2.0",
    "react-redux": "^5.0.7",
    "react-router-dom": "^4.2.2",
    "react-scripts": "1.1.1",
    "redux": "^3.7.2"
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "jest",
    "eject": "react-scripts eject"
  },
  "devDependencies": {
    "babel-cli": "^6.26.0",
    "babel-jest": "^23.0.0-alpha.0",
    "babel-preset-env": "^1.6.1",
    "babel-preset-react": "^6.24.1",
    "enzyme": "^3.3.0",
    "enzyme-adapter-react-16": "^1.1.1",
    "enzyme-to-json": "^3.3.3",
    "jest": "^22.4.2",
    "react-test-renderer": "^16.2.0"
  },
  "jest": {
    "notify": true,
    "snapshotSerializers": [
      "enzyme-to-json/serializer"
    ],
    "setupTestFrameworkScriptFile": "./src/setupTests.js",
    "transform": {
      "^.+\\.jsx?$": "babel-jest"
    }
  }

<!-- Content of Test file App.test.js -->
import React from 'react';
import { shallow, mount } from 'enzyme';
import App from '../../src/components/App';

// describe what we are testing
describe('Render App Component', () => {
 
 // make our assertion and what we expect to happen 
 it('should render without throwing an error', () => {
    wrapper = shallow(<App />);
    expect(wrapper.find('.app__wrapper').length).toEqual(1);
 })
})

Answer 1

以下是我解决问题的方法。

•将以下内容添加到.babelrc文件中，并确保.babelrc位于根文件夹中

{ "presets": ["env","react"] }

•确保排除CSS，图像，SCSS，PDF，字体等静态资源。将以下内容添加到package.json中，如屏幕截图中所示

"moduleNameMapper": {
  "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$":
    "<rootDir>/__mocks__/fileMock.js",
  "\\.(css|less)$": "<rootDir>/__mocks__/styleMock.js"
}

截图：

Answer 2

如果有人过来弄清楚发生了什么，我认为公认的答案与这里的问题无关。

当文件扩展名是.js时，如果您尝试在该文件中编写JSX，则linter将抱怨您是否具有正确的ESlint配置。

相反，请尝试将文件扩展名更改为.jsx 或 .tsx（如果涉及打字稿）。