test(v4): add basic CSS modules coexistence

[colinaaa]

Summary

• Add a minimal CSS Modules fixture under - \ (entry)\n - \ (CSS module)
• Add a Playwright test in \ that ensures Tailwind utilities still work () while CSS Modules styles are applied (), without relying on \ or .

Notes

• Only the new CSS Modules test and its fixtures are included; existing plugin behavior and other tests are untouched.

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[gemini-code-assist]

Summary of Changes

Hello @colinaaa, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces new testing infrastructure to validate the seamless integration of the Tailwind CSS plugin with CSS Modules. The primary goal is to confirm that both styling approaches can coexist within a project, ensuring that Tailwind utilities are applied as expected even when CSS Modules are in use, thereby enhancing the robustness and compatibility of the styling solution.

Highlights

• New CSS Modules Fixture: A minimal CSS Modules fixture has been added to provide a testing environment for coexistence.
• Playwright Test for Coexistence: A new Playwright test ensures that Tailwind CSS utilities function correctly when CSS Modules styles are also applied, without requiring specific configurations like postcss-loader or css-loader.

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Changelog

• test/css-modules/index.test.ts
  • Added a Playwright test to verify the coexistence of Tailwind CSS and CSS Modules.
  • Configured Rsbuild with the Tailwind CSS plugin for the test.
• test/css-modules/src/components/Button.module.css
  • Created a new CSS module file defining a basic button style.
• test/css-modules/src/index.js
  • Added an entry point for the test fixture, importing CSS module styles and applying both CSS module and Tailwind classes to a button element.

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[gemini-code-assist]

Code Review

This pull request adds a new test case to verify that Tailwind CSS can coexist with CSS Modules. The changes are well-structured, including a new Playwright test and the necessary fixture files. The test logic is sound. I have one suggestion to improve the test's robustness by ensuring resources are always cleaned up, even in case of test failures.