Worked on the junit-team/junit5 repository to enhance test reliability by standardizing precondition validation across JUnit 5 tests. Refactored existing tests to replace direct usage of assertThrows with PreconditionAssertions, establishing a consistent approach to precondition checks throughout the codebase. This change improved the readability and maintainability of test code, reducing the likelihood of test flakiness and simplifying future updates. The work involved applying Java and JUnit skills, with a focus on refactoring and testing best practices. Delivered a single feature during the month, emphasizing code consistency and maintainability without introducing new bugs or regressions into the project.