Kyua is a testing framework that enables the definition and execution of tests written in various languages such as C, Python, and shell scripts, originally derived from the ATF project for NetBSD. Users can install Kyua on FreeBSD and create tests using a defined structure in Kyuafiles, which allow integration with the Jenkins CI platform for continuous integration and reporting. Key features include generating reports in multiple formats and running tests through commands within the FreeBSD testing environment.