Worked on enhancing the stability of the compiled testing utilities in the atlassian-labs/compiled repository, focusing on robust handling of SVG elements within frontend test environments. Addressed a recurring crash in the toHaveCompiledCss matcher by replacing the use of element.className.split with element.classList, ensuring compatibility with SVG nodes and eliminating related runtime errors. Expanded the Jest-based test suite to include SVG-specific scenarios, which improved overall test coverage and reduced the likelihood of regressions. Utilized JavaScript and TypeScript to implement and validate these changes, resulting in more reliable testing workflows and decreased CI flakiness for projects leveraging SVG components.