Jie Dai enhanced the SalesforceCommerceCloud/pwa-kit repository by expanding unit test coverage for the base error component in the template-retail-react-app, focusing on error handling validation and user experience reliability. Jie refactored test setups to ensure isolation by restoring window.location and resetting modules between tests, which reduced side effects and improved test accuracy. The work leveraged JavaScript, React, and Jest, emphasizing frontend development and automated testing. Additionally, Jie streamlined the CI process by skipping changelog generation, accelerating release cycles. These contributions deepened the reliability of error handling, reduced regression risk, and established a more maintainable and efficient testing workflow.