Ok, I will write this out nice and simple.
1. Testing is valid.
2. Tests demonstrate testing to be valid.
3. Therefore, testing is valid.
You're assuming the very thing you're supposed to be proving. It's akin to the question begging that Bible-thumpers do:
1. The Bible is true.
2. The Bible states that the Bible is true.
3. Therefore, the Bible is true.
Edited by Doddy, : sdelling
Edited by Doddy, : clarify first example
Edited by Doddy, : I bad at grammar
Edited by Doddy, : informative subtitles
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What do you mean "You can't prove a negative"? Have you searched the whole universe for proofs of a negative statement? No? How do you know that they don't exist then?!