To expand on Mudfoot's cryptic contribution:-
Airbus used the failed breakage test to calibrate the codes they used for the design. Using the established level of accuracy (say \alpha), they redesigned the structure at the breakpoint and validated the redesigned wing using the codes to a level of at least (1.5 + \alpha) times design load, and provided all this evidence to the certification authorities, which accepted it as equivalent to a wing test.
PBL