Janne Juhola enhanced the reliability of the application resubmission flow in the City-of-Helsinki/yjdh repository by developing comprehensive unit tests for the setIsResubmission logic. Focusing on both draft and non-draft application scenarios, Janne used TypeScript and React to ensure that edge cases were thoroughly covered. The testing approach included mocking dependencies such as API queries and routing to isolate the logic under test, which reduced the risk of failures in production. Janne’s work resulted in clear, maintainable test documentation and structure, supporting future contributors and improving the overall robustness of the front end resubmission handling process.