Developed targeted conformance tests for the WebNN API’s graph.devices functionality within the mozilla/gecko-dev repository, focusing on improving device enumeration validation. Leveraging JavaScript and Web Platform Testing, the work introduced automated checks to ensure that graph.devices consistently reports a non-empty device list, thereby enhancing the reliability of device detection. The tests were integrated as test-only contributions through the WPT workflow, supporting robust regression detection and accelerating QA feedback cycles. This effort strengthened overall WebNN API quality assurance coverage and established a foundation for future expansion of graph.* feature tests, reflecting a methodical approach to standards compliance and test-driven development.