Games : i need help with /execute

I have been make a massive row of command blocks for a double jump mechanism and thought cane I use /execute i have used it before for

execute @e[type=Snowball] ~ ~ ~ /summon Fireball ~ ~ ~ {ExplosionPower:5,direction:[]}

but i cant get it to work for these two commands

testfor @a[score_jump_min=1] and fill ~-2 ~-1 ~-2 ~1 ~-1 ~1 barrier 0 replace air 0

i am trying to do /execute test for @a[score_jump_min=1] ~ ~ ~ fill ~-2 ~-1 ~-2 ~1 ~-1 ~1 barrier 0 replace air 0

at the moment they are in separate command blocks