Airbus, like all 'French' and 'German' aerospace companies, require all of their test pilots to be graduates of a recognised test pilot school. France and Germany are fairly unique in that their governments require their test pilots (and FTEs in the case of France) to be licensed. (However, there are certain levels of license, for example a TB1 license allows only the tp to flight test light aircraft. The training requirements are much less for this). Since the vast majority of these are ex-military, then almost by definition, all test pilots at Airbus are, as far as I am aware ex-military. Some of the other commercial companies such as Cessna, Bombardier etc generally use experienced commercial pilots, or even engineers that they then train to become pilots, and then eventually test pilots.