Manual development of automatic tests for embedded C software is a strenuous and time-consuming task that does not scale well. With the accelerating pace of software release cycles, verification increasingly becomes the bottleneck in the embedded development workflow. This paper presents a Retrieval-Augmented Generation (RAG) pipeline as a solution for partial automation of the verification process. By grounding a large language model in project-specific artifacts, the approach reduces hallucinations and improves project alignment. An industrial evaluation showed that the generated tests are 100 % syntactically correct, with 85 % successfully passing runtime validation. The proposed solution has the potential to save up to 66 % of the testing time compared to manual test writing while generating 270 tests per hour.
@article{arxiv.2603.09497,
title = {EmbC-Test: How to Speed Up Embedded Software Testing Using LLMs and RAG},
author = {Maximilian Harnot and Sebastian Komarnicki and Michal Polok and Timo Oksanen},
journal= {arXiv preprint arXiv:2603.09497},
year = {2026}
}