Developers Can Detect Silent Filter Bugs by Asking Two Questions With Different Answers

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A developer discovered a simple debugging technique after encountering silent filter failures twice in one session, where tools returned plausible but incorrect results without any error. The method involves posing two questions to a tool whose correct answers cannot be identical, then comparing the outputs to detect whether filtering is actually working. In one case, a mailbox search script returned the same count of 51 messages for two different queries, revealing that no filter had been applied at all. In another instance, a process count query returned six results, but a follow-up question exposed that two were stale leftover processes from the previous day. The author notes that this two-call technique requires no deep understanding of the tool and costs only one extra query to catch bugs that would otherwise go unnoticed.

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