Worked on stabilizing test reliability for the mx-chain-go repository, focusing on reducing flakiness in critical test components rather than adding new features. Addressed a persistent issue with the RequestHandlerStub in testscommon by introducing a WaitGroup to synchronize asynchronous code, which improved the determinism of test outcomes. Cleaned up test logs by removing unnecessary debug print statements, resulting in faster and clearer CI feedback. Also reverted an unnecessary import and extra blank line to maintain core stub behavior. Utilized Go and concurrency techniques, with an emphasis on debugging and unit testing, to deliver more reliable and maintainable test infrastructure.