" Typically, Boeing tests the wings and components separately, while Airbus tests entire assemblies.'
Partly right- mostly wrong. While BA does test some items separately, they always test two complete structures.
BTW, the image you provided was for the drop test, not a fatigue test as noted by the thread subject. Again, while Airbus does a cyclical fatigue test on the entire airframe, Boeing does a wing test, not including the wingbox and fuselage...
I did say typically. I was actually referring to the design and research. It is well known that Boeing designs the wings and models them individually, as they do not consider the fuselage/wingbox in any lift capacity, while Airbus does, hence the much different wingbox design.