Andrey Silichenko enhanced the JetBrainsRuntime repository by improving the reliability and portability of Java test harnesses. Over two months, he enabled native execution for processor information tests and streamlined path resolution logic, reducing cross-platform test flakiness and accelerating CI feedback. In addition, Andrey delivered a robustness enhancement for Java ProcessBuilder tests, increasing native test timeouts and refining Windows environment-variable handling to ensure consistent execution across diverse systems. His work, primarily in Java and focused on runtime and testing, addressed both feature development and bug resolution, demonstrating a methodical approach to improving test accuracy and maintainability in complex, multi-platform environments.