Worked on the kestra-io/kestra repository to enhance the reliability of core utilities by expanding unit test coverage for the MathUtils module. Focused on validating rounding behavior and ensuring robust handling of invalid input, the work involved adding comprehensive JUnit-based tests in Java. This targeted approach to test-driven development aimed to reduce regression risk and support safer refactoring of core logic. By improving the test suite, the contribution strengthened continuous integration stability and streamlined quality assurance processes. The emphasis on unit testing discipline and Java core utility validation resulted in higher confidence in future releases and maintainability of the codebase.