Dummy in practice tool

So i've been trying different builds with different champions in practice tool and adding an enemy dummy to see how much damage i do. The problem is, i don't think it's very accurate, it doesn't seem to register the extra damage dealt from items like guinsoos rageblade on the "total damage dealt" section, nor does the "DPS" section or "last hit" offer much accuracy either. As this was one of the main features of the tool, it's not very useful right now.