Rotten Flesh undetectable by /testfor command

When I use the /testfor command to detect rotten flesh, it does not function. The command is use is as follows: /testfor @e[type=item,name=rotten_flesh] yet to no avail is it detected, even with using the radius variable set to: r=10.  Almost every other item works, so far, besides the spider eye, xp orb and rotten flesh.(I haven't tested all)