What was found
AIRCRAFT WAS NOT GNDED. SMOKE LAVATORY SMOKE ECAM. NO SMOKE NOTED IN MID CABIN LAVATORY. ECAM WAS ON FOR LESS THAN 1 MIN, WOULD NOT RECALL. PERFORMED OPERATIONAL TEST OF LAVATORY SMOKE DETECTOR IAW AMM 26-17-00-710-011A. OPERATIONAL TESTED OK, NO FAULT NOTED ON GND TEST, LAVATORY SMOKE DETECTION SYS CHECKED OK.