Worked on the Shopify/rails repository to enhance the reliability of authentication-related tests by updating test selectors to match the actual DOM structure. Focused on stabilizing the authentication guide’s validation process, the developer modified tests to target an h4 heading instead of an anchor, ensuring that the absence of the 'Store Settings' element is accurately detected. This adjustment reduced the occurrence of false positives and negatives, improving test reliability and documentation traceability. The work involved careful use of Ruby for test logic, Markdown for documentation, and a strong emphasis on testing best practices to align automated checks with real user interface markup.