Worked on enhancing the testing infrastructure for the yt-dlp/yt-dlp repository by expanding the hatch-test environment to include both 'curl-cffi' and 'default' features. This update enabled broader test coverage and allowed for more realistic dependency scenarios during continuous integration runs. The approach focused on environment configuration and testing, leveraging Python packaging tools and TOML for precise extras management. By improving the test environment, the work contributed to faster feedback loops and more reliable validation of feature sets across different environments. No bugs were addressed during this period, with efforts concentrated on strengthening the foundation for future development and testing.