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If you set a watchdog timer, you should clear it when its no longer needed. Otherwise it can go off, aborting your test script. In these twenty test files, it hasn't mostly been a problem because the script finishes before the timer goes off. But I bet that some heisenbugs have been the result of not clearing it. It actually shouldn't be necessary to clear the timer when that is the final statement in the test file, but we may want to add a porting test that makes sure watchdogs are cleared, and always adding a clear enables such a test to properly work.