Help! Jest + React + JSX + ESM

Setup

1. Install Node 18 or nvm install or nvm use.
2. Install dependencies with npm i.

Start

1. Start the web server with npm start.
2. Browse to http://localhost:1234 to see "Hello world" rendered.

Test

1. Run npm t which will fail due to not being configured for JSX.
2. Help me get the test passing!

Constraints

• The type field in package.json must NOT be set to module. Source files should end with .mjs extension. I have reasons for this.
• Test files must live in ./tests and may end with .test.js or .test.mjs.