Worked on the langflow repository to enhance error-handling tests for file download functionality, specifically targeting scenarios where non-existent files are requested. Developed and integrated a 404 error handling test using Python, focusing on backend development and API testing principles. After evaluating the impact, the test was reverted to maintain alignment with the existing error-handling strategy and to ensure no changes affected production behavior. This process validated the rollback workflow and preserved codebase stability, while documenting testing decisions for future reference. The work demonstrated a careful approach to testing and code maintenance, emphasizing reliability and backward compatibility within the project.