jinjukuNo, it tests the claim.
When it comes to scientifically valid double-blind listening tests, you clearly don’t know what you’re talking about. You don’t even understand what it is that you’re testing.
In fact, the ideal listener involved in such a test has no "claim" and no preference whatsoever. Your notion that you’re testing the listener and his "claim" explains why you think the test will have a "loser" and why he should pay your "expenses."
Your extreme bias here is exactly why a valid test has to be double-blind. Your mere presence in the room would have the potential to taint any listening test.
Consider this: if a scientific test of a new drug has no effect on an individual, what "failed" the test? The human? Or the drug? If after two years the drug still has no effect on that individual, does it mean the drug is not effective? Or, does it mean it was not effective with that individual?
This is all very basic science.