Are you saying all the F-WW?? are Airbus test registrations?
As a rule of thumb (although there have been exceptions):
F-WWAA to F-WWDZ are/were used by Airbus
F-WWEA to F-WWEZ by ATR
F-WWFA to F-WWHZ by Dassault
F-WWIA to F-WWKZ by Airbus
F-WWLA to F-WWLZ by ATR
F-WWMA to F-WWMZ by Dassault
F-WWNA to F-WWNZ by Cessna and Mudry
F-WWOA to F-WWPZ by Aerospatiale/Eurocopter
F-WWRA to F-WWRZ by SOCATA
F-WWSA to F-WWTZ by Airbus
F-WWUA to F-WWVZ by Dassault
F-WWWA to F-WWWZ not used
F-WWXA to F-WWXZ by Aerospatiale/Eurocopter
F-WWYA to F-WWYZ by Airbus
F-WWZA to F-WWZZ by Dassault