Worked on upgrading the testing infrastructure for the eclipse.platform.ui repository, focusing on migrating the OpenProjectExplorerFolderTest from JUnit 4 to JUnit 5. This migration introduced modern lifecycle management using Java and enhanced performance testing by integrating JUnit 5’s @BeforeEach and @AfterEach hooks to manage the PerformanceMeter. The approach improved test maintainability and stability, aligning the test scaffolding with current best practices in unit and performance testing. By updating the test framework, the work accelerated QA feedback cycles and ensured that performance tests are more reliable and easier to extend, contributing to a more robust quality assurance process overall.