- Create justfile-based testing framework with 20+ test targets
- Support different deployment scenarios: container, booted system, disk-based, fresh install
- Environment detection for OSTree, container, boot type, and system info
- CLI functionality testing for all apt-ostree commands
- Error handling and performance testing
- Test report generation and cleanup utilities
- Comprehensive documentation in TESTING.md
- Mindful of system state: booted, container, installed, or disk image
