/testfor seems to treat commandblocks as players.
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This command block was attached to a hopper clock and as you can see behaved as if a player had used the command, not a command block.
I can confirm t his. I had a working testfor on a hopper clock and it stopped working after upgrade to 13w39a. I checked out the block and it shows an error in previous output, it says it requires an analog output. But I have the same comparator as I had previously working. I tried setting it up again using a comparator of course, still not working.
The command block stated "[14:00:25] /testfor is only usable by commandblocks with analog output" within the "previous output" box.