test: add a `react.test.tsx` and `react-server.test.tsx` test suites

[aidenybai]

⚠️ For CodeDay Labs students only! ⚠️

Is your feature request related to a problem? Please describe.

Currently, we have test suites for some parts of the mono repo, but we are missing test, particularly for the React components.

Describe the solution you'd like

Your job is to write at least 3 tests for both react.test.tsx and react-server.test.tsx, utilizing the packages/react and packages/react-server monorepo packages.

You will need to use @testing-library/react (basic tutorial) to complete this task.

**Do note that we use a custom JSX transform. This means, you will have to handwrite React.createElement calls instead of JSX`:

An example component you could use

import { createElement } from 'react';

function Component() {
    return createElement('div', { title: 'hello' }, 'test'); // would represent <div title="hello>test</div>
}

Other examples of test suites within the repo: https://github.com/aidenybai/million/blob/main/test/block.test.tsx

[github-actions[bot]]

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