Developed expanded end-to-end test coverage for blob data handling within the chromaui/chromatic-e2e repository, focusing on the createObjectUrl functionality. The work involved implementing comprehensive tests to validate blob URL creation, data fetching, and display, as well as introducing a dedicated fixture page to support these scenarios. Leveraging JavaScript and TypeScript, the developer established fixture-based scaffolding to ensure reliability and reproducibility of blob-related UI flows. This approach strengthened release readiness by enabling early detection of regressions, reduced manual QA effort, and lowered support risk. All changes were tracked with clear commit traceability, emphasizing maintainability and transparency throughout the development process.