Chong Ren Lee enhanced the test infrastructure for the LifeSG/web-frontend-engine repository by improving the reliability of automated testing workflows. He addressed a common issue in JavaScript and TypeScript projects where focused tests, marked with 'fit', could inadvertently bypass full test suite execution. By migrating all focused tests to standard 'it' blocks, Chong Ren ensured that every test runs by default, eliminating the risk of hidden tests passing unnoticed in both local and CI environments. This adjustment, rooted in frontend development and unit testing best practices, strengthened test coverage without altering production code, reflecting a targeted and thoughtful engineering approach.