Worked on enhancing the reliability of the test infrastructure for the eclipsesource/theia repository by addressing a persistent issue with Playwright test path resolution. Refactored the test configuration to use absolute paths derived from __dirname, effectively decoupling test execution from the current working directory and eliminating context-dependent failures, such as those encountered when running tests from the VSCode Playwright extension. This solution, implemented using Node.js, Playwright, and TypeScript, improved CI stability and reduced test flakiness. The changes were validated through continuous integration and contributed to more maintainable test documentation, supporting faster feedback cycles and greater confidence in release quality.