I've been riding chinese wheels for years on the road, mtb and gravel bike. Over 500km per week, all year round, high absolute power. BTLOS, Lightbicycle, Nextie, Serenade and also Elitewheels. Carbon spokes as well as steel. Never has a hub failed on me. Bearings gone bad, spokes broke, but never the hub itself.
So would be interesting what failing during testing means?