chore: add tests the @halvaradop/tailwindcss-core package

[halvaradop]

Description

This pull request introduces tests for the @halvaradop/tailwindcss-core package, specifically focusing on verifying the extractClasses function. These tests ensure that the function correctly extracts Tailwind CSS classes from HTML and can handle the new utilities provided by the plugins supported by @halvaradop/tailwindcss.

Key changes:

• Added tests to verify the extractClasses function.
• Ensured that the function can accurately extract new utilities introduced by plugins.
• Improved test coverage for the core package.

Checklist

• Added documentation.
• The changes do not generate any warnings.
• I have performed a self-review of my own code
• All tests have been added and pass successfully

Notes

[github-actions]

Thank you, @halvaradop, for your contribution to halvaradop/tailwindcss-utilities.

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