Mark VanderVoord and Michael Karlesky, the innovative minds behind the open-source tools Unity, CMock, and Ceedling, delve into the evolution of unit testing for C code in embedded systems. They discuss the challenges of transitioning from proprietary to open-source and the emotional hurdles maintainers face. The duo highlights gaps in existing integration testing tools and the vital role of simulators. They also share the exciting news about the upcoming Ceedling 1.0 release and the launch of Ceedling Pro, showcasing their commitment to enhancing the embedded development community.