testing: use T.Skip to mark a fuzz input as uninteresting #48299
Currently, the fuzzing engine marks an input as "interesting" if it activates coverage counters that were not activated before. Interesting inputs are minimized and added to the cached corpus. New inputs may be derived from them.
Fuzz target authors may not want to spend time fuzzing certain kinds of inputs, for example, because they're unlikely to find bugs or because they're expensive or impractical to test. It would be useful to have some signal that an input is not interesting and should not be added to the cached corpus.
Compare with go-fuzz, which has a similar feature: the fuzz function may return:
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