Worked on the apache/texera repository to enhance frontend reliability by developing comprehensive unit test coverage for key services. Focused on the CodeEditorService and OperatorReuseCacheStatusService, the work validated state management and event handling, including independent operator ID tracking and robust null or edge-case scenarios. Leveraging Angular, TypeScript, and RxJS, the developer implemented CI-friendly test strategies with clear, descriptive test names to streamline future debugging and maintenance. The approach emphasized maintainability and regression risk reduction, aligning with project goals for higher quality frontend behavior and faster feature delivery, while ensuring websocket-driven features were thoroughly tested for correctness and resilience.