Batary

Confirmed for 14w20b. But the testfor command works for me.

Thanks a lot !
I didn't know the "DropChances" tag can be set to a higher value than 1 : for me it was linked to a percentage. I still think this is a small bug, but thanks to you that's not really important now.
This topic can be set to resolved.

Confirmed. I used this command :
give @p writable_book 1 0 {display:{Name:"The Book"}} .

You have forgotten the "Count" value :
/summon Item ~ ~ ~3 {Item:{id:minecraft:diamond,Count:1}}