test(v4): add features verification (3d transform, container query, !important)

[colinaaa]

This PR adds test cases for new Tailwind CSS v4 features including 3D transforms, container queries, and the !important modifier syntax.

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Summary of Changes

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This pull request introduces a dedicated test suite to validate the correct implementation and behavior of several new features in Tailwind CSS v4. By adding these tests, we ensure that the plugin properly processes and applies advanced styling capabilities like 3D transforms, container queries, and the !important modifier, thereby enhancing the robustness and compatibility of our Tailwind CSS integration.

Highlights

• New Test Suite: A new Playwright test suite has been added specifically to verify the functionality of new Tailwind CSS v4 features.
• Tailwind CSS v4 Features: The tests cover key v4 features including the !important modifier syntax, 3D transforms (e.g., perspective and rotate-x), and container queries.
• Rsbuild Integration: The tests utilize Rsbuild with the Tailwind CSS plugin to ensure proper integration and compilation of these new features.

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Changelog

• test/v4-features/index.test.ts
  • Added a new Playwright test file to verify the correct application of Tailwind CSS v4 features.
  • Configured Rsbuild to use the Tailwind CSS plugin for the test environment.
• test/v4-features/src/index.css
  • Created a new CSS file to import the Tailwind CSS framework, enabling its utility classes for the test page.
• test/v4-features/src/index.js
  • Implemented a new JavaScript file that dynamically creates HTML elements and applies Tailwind CSS v4 utility classes to them, serving as the target for Playwright assertions.

Activity

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Code Review

This pull request adds test cases for new Tailwind CSS v4 features, including 3D transforms, container queries, and the !important modifier syntax. The tests are well-designed and cover the intended features. I have one suggestion to improve resource handling in the test setup to prevent potential resource leaks.