Romain Skraba focused on enhancing the test infrastructure for the Apache Flink integration path, specifically within the githubnext/discovery-agent__apache__flink repository. He migrated the flink-hadoop-bulk test suite from JUnit 4 to JUnit 5, updating test classes and methods to use modern annotations and extensions. This migration involved refactoring setup and cleanup logic to align with the JUnit 5 lifecycle, improving test reliability and maintainability. Working primarily in Java and leveraging his expertise in testing and JUnit 5 migration, Romain addressed technical debt in the test suite, contributing to future CI efficiency while maintaining overall system stability and quality.