After the testing for GPUAdapterInfo.isFallbackAdapter was added in PR #4303 there are possible unexpected FAILED results in case if platform supports only fallback (software) adapter even if forceFallbackAdapter=false

webgpu:api,operation,adapter,requestAdapter:requestAdapter
t.expect(adapter.info.isFallbackAdapter === Boolean(forceFallbackAdapter));

https://gpuweb.github.io/gpuweb/#dom-gpurequestadapteroptions-forcefallbackadapter

Note: requestAdapter() may still return a fallback adapter if forceFallbackAdapter is set to false and either no other appropriate adapter is available or the user agent chooses to return a fallback adapter. Developers that wish to prevent their applications from running on fallback adapters should check the info.isFallbackAdapter attribute prior to requesting a GPUDevice.