What was found
ON TAKEOFF ROLL, ADVANCED THRUST LEVERS, NR 1 ENG DID NOT SPOOL UP, REJECTED, SLOW SPEED, TAKEOFF. GOT 'AUTO FLIGHT AUTO THRUST OFF ECAM. RETURNED TO GATE. ACCOMPLISHED OPERATIONAL TEST OF THE ENG & AUTO THRUST SYS ISOLATION IAW AMM TASK 22-30-00-710-003A. PARAMETERS NORMAL, GND CONFIDENCE TESTED OK.