Oumi Mandal developed comprehensive unit tests for the Webfinger endpoint in theopenlane/core, focusing on both successful user lookups and error scenarios such as non-existent users and invalid resource formats. Using Go, Oumi applied test-driven development practices to enhance backend reliability and ensure robust API behavior. The work emphasized API testing and unit testing, targeting edge cases to strengthen the endpoint’s resilience. By expanding test coverage, Oumi improved the CI feedback loop and reduced the risk of regression in user lookup functionality. This contribution deepened the project’s quality assurance foundation and demonstrated a methodical approach to backend development challenges.