Worked on the curl/curl repository to enhance test coverage for output formatting boundaries in the timebuf and max5data functions. Focused on expanding unit tests using C and software testing techniques, the work introduced boundary-focused test cases and migrated diagnostics to assert-based failures, ensuring regressions are surfaced immediately. Developed exact-output tables to probe critical transition points, such as max5data’s 99999 and 100000 boundaries and timebuf’s handling of durations like 6 days, 1 hour, and over 99999 years. These improvements reduced the risk of silent formatting regressions and increased the maintainability and reliability of the existing test suite.