During June 2025, Phillis enhanced the reliability of the WebNN API within the mozilla/gecko-dev repository by developing targeted conformance tests for the graph.devices property. Using JavaScript and Web Platform Testing, Phillis implemented a test-only integration that validates device enumeration, ensuring that graph.devices consistently reports a non-empty device list. This approach improved regression detection and accelerated QA feedback cycles, directly addressing the need for robust validation of device reporting. The work laid a foundation for future expansion of graph.* feature tests, demonstrating a focused application of WebNN API expertise and a methodical approach to strengthening automated quality assurance processes.