Worked on stabilizing and improving the reliability of the test suite for the apache/logging-log4j2 repository, focusing on asynchronous thread context and syslog tests. Addressed state leakage issues by introducing ThreadContext.clearAll in JUnit 5’s @BeforeEach, ensuring each test ran in a clean environment. Increased Awaitility timeouts to better accommodate asynchronous operations and refactored SyslogAppenderCustomLayoutTest to use polling instead of fixed delays, reducing test flakiness and improving CI feedback speed. Utilized Java, Log4j, and testing frameworks to enhance test determinism, directly contributing to higher library quality and more predictable release cycles through thoughtful test design and refactoring.