Worked on the webpack/webpack repository to enhance the reliability of core formatting utilities by expanding unit test coverage for the formatSize and formatLocation functions. Focused on validating edge cases, such as negative sizes and diverse location formats, the work aimed to reduce regression risks and support safer refactoring. Leveraged JavaScript and modern testing frameworks to implement comprehensive tests, ensuring these utilities behave predictably across a range of scenarios. This effort contributed to improved maintainability and stability within the codebase, aligning with a broader initiative to promote test-driven development practices and support more stable releases for the webpack/webpack project.