Testfor Command is NOT WORKING. In latest snapshot it says (output):
/testfor is only usable by command blocks with analog output (all command blocks say that)
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duplicates 1
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Duplicate of MC-32672 - If you have not, please use the search function in the future, to see if your bug has already been submitted. If you could not find the original report, please comment with the keywords you searched for.
Dublicate of MC-32672 !
Please use the search function, bugs like this are reported relatively fast, you can expect them to be already created hours after the snapshots release.