'jest is undefined in react

I'm new to react and doing a small project myself. I followed the official tutorial.

I used npx create-react-app to create the project by default and use npm start to start dev server.

However, things suddenly went wrong. the html page have nothing and print an error message that jest is not defined(import retryTimes = jest.retryTimes; at /src/conpement/GamePanel.tsx, line 5, this code is auto-generated by react)

my git repo: https://git.starlight.cool/Steve/empire-frontend

Thank you for your help. If you find anything wrong please tell me.

reactjs jestjs

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'jest is undefined in react

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