Entity Inventory Slot Detection

I'm trying to use a command for a map I am creating and I need to test for if an armorstand by the name of Skeletor is wearing a golden helemet on its head. Here's the command I've been using:
/testfor @e[name=Skeletor,Inventory=[{Slot:103,id:golden_helemet}]
but its says:
The entity UUID provided is in an invalid format.
Best Answer
The Inventory
tag doesn't work on armor stands, but the Equipment
tag does.
/testfor @e[name=Skeletor] {Equipment:[{id:"",Count:,tag:{}...},{id:,Count:...},{id:...},{id:},{id:}]}
.
The five arguments come in this order: Held Item, Boots, Pants, Chestplate, Helmet. You want to test for boots, so I would try this command:
/testfor @e[name=Skeletor] {Equipment:[{},{},{},{},{id:golden_helmet}]}
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