Filemon Michalski developed a WebSocket Connection Testing feature for the TouK/nussknacker repository, focusing on enhancing the user interface for WebSocket nodes. He implemented a 'Test Connection' button that allows users to validate WebSocket connections directly from the UI, providing immediate feedback on connection status and error messages. The solution integrated both frontend components using React and backend services with Node, leveraging JavaScript and TypeScript for seamless communication. This work addressed the need for faster troubleshooting and improved reliability in WebSocket-based flows. The feature demonstrated depth by covering end-to-end testing, real-time feedback, and robust error handling within a single release.