I built a tool to catch empty scans read as passes, and shipped it with an empty scan read as a pass

The tool has a self-test. It plants two positive fixtures that must be found and four negative fixtures that must stay quiet. Then it prints a control line, and you read the real numbers only after that line is green.

It printed the control line. All four negative fixtures were clean. Both positives were reported as seen.

The skip list contained fixtures.

Zero files were scanned. Every fixture directory was excluded by name before the walk reached it, so the four negatives were clean in the way that a locked room is quiet. The control passed on an empty set.

The fix is one line and one idea