During December 2024, Lucas Satabin focused on improving test reliability in the typelevel/cats-effect repository by addressing resource leak issues in ResourceSpec tests. He worked with Scala, applying concurrency and functional programming techniques to ensure resources were safely finalized during cancellation scenarios. Lucas re-enabled a previously commented-out test to verify that no resource leaks occurred, and marked another as pending to avoid continuous integration failures caused by an external PureConc finalizer bug. His approach emphasized robust testing and CI stability, resulting in reduced production risk and less CI noise. The work demonstrated careful attention to detail and deep technical understanding.