Astro Wu enhanced the AutoMQ/automq repository by developing comprehensive unit tests for the WALCallbackSequencer within the s3stream module. Focusing on backend development with Java, Astro addressed edge cases such as handling empty queues after processing requests and validated the tryFree method’s behavior for both empty and non-empty queues. The work also included testing exception handling in the before method and verifying correct after-method behavior when request offsets differed from expectations. By strengthening the unit testing suite, Astro reduced regression risk and improved code reliability, enabling safer future refactoring and feature development while demonstrating strong skills in Java and unit testing.