React 单测: 解决 'experimental syntax 'jsx' isn't currently enabled' 错误

To enable support for JSX syntax in React unit tests, you need to configure Babel to transpile JSX code. Here are the steps to follow:
\

1. Install the required dependencies:\

   npm install --save-dev @babel/preset-react @babel/plugin-syntax-jsx\
   ```\
   

2. Create a Babel configuration file if you don't have one already. In the root directory of your project, create a file named .babelrc.

3. Inside the .babelrc file, add the following configuration:\

{\
  "presets": ["@babel/preset-react"],\
  "plugins": ["@babel/plugin-syntax-jsx"]\
}\
```\
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4. Now, you can run your React unit tests without encountering the "experimental syntax 'jsx' isn't currently enabled" error.\
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Note: If you're using a different method to configure Babel (e.g., `babel.config.js`), make the necessary changes in that file instead.