Hi I am trying to make my own Custom Crafting Dropper, I Need to testforblock near the player to find a dropper with the ingredients.

I tried this:

execute @p[r=10] ~ ~ ~ /testforblock ~ ~ ~ dropper 1 {Items:[0:{Slot:0b,id:"minecraft:stone",Count:1b,Damage:0s,},1:{Slot:1b,id:"minecraft:stone",Count:1b,Damage:0s,},2:{Slot:2b,id:"minecraft:stone",Count:1b,Damage:0s,},3:{Slot:3b,id:"minecraft:stone",Count:1b,Damage:0s,},4:{Slot:4b,id:"minecraft:redstone_block",Count:1b,Damage:0s,},5:{Slot:5b,id:"minecraft:stone",Count:1b,Damage:0s,},6:{Slot:6b,id:"minecraft:stone",Count:1b,Damage:0s,},7:{Slot:7b,id:"minecraft:stone",Count:1b,Damage:0s,},8:{Slot:8b,id:"minecraft:stone",Count:1b,Damage:0s,},],id:"Dropper",Lock:"",}

But the command can't find the dropper.

My plan is that I will spawn a dropper from A villager named "Test" using

execute @e[name=Test] ~ ~ ~ /setblock ~ ~ ~ dropper

and then the villager will die

kill @e[name=Test]

The testforblock will test if the ingredients are inside the dropper and I will clone the dropper with the results from the custom crafting and replace the dropper with The ingredients.