generally, depending on data and percentage loads, going to full destruction is NOT a requiement.
To be a little more precise, driving the full scale wing to destruction is not a requirement, if you can support your calculation and test results with destructive tests on component or coupon level.
Every design detail on the wing has to be driven to destruction, but this can be done in smaller scale tests. Due to the heavy deformation, stress in some components is not rising linearly with load, this needs to be somehow determined by the full scale test to relate the (simple) cupon loading to the (complex) full scale loads.
Breaking CFRP is tricky and dirty.
and dangerous... For metal a lot of the energy is dissipated by plastic deformation, for CFRP practically all energy introduced is stored elastically in the material and set free at the moment of failure!
This can be quite violent sending some parts, fragments, loading or measurement equipment flying through the hangar even breaking through walls...