Treating Run-time Execution History as a First-Class Citizen: Co-Versioning Run-time Behavior alongside Code: Dataset

Marcus Kessel. 2026. Treating Run-time Execution History as a First-Class Citizen: Co-Versioning Run-time Behavior alongside Code. In 34th ACM Joint European Software Engineering Conference and Symposium on the Foundations of Software Engineering (FSE Companion ’26), July 05–09, 2026, Montreal, QC, Canada. ACM, New York, NY, USA. https://doi.org/10.1145/3803437.3805589 (a preprint is available on [arxiv](http://arxiv.org/abs/2604.16933).This repository contains the replication package for our FSE 2026 paper. It provides a pytest plugin that captures runtime test execution behavior and stores it alongside code changes in a lakehouse architecture. The collected data enables longitudinal analysis of how tests and production code co-evolve, including 8 categories of behavioral changes between commits (example dataset for python dateutil is included).