Prove it, both directions

A green result proves nothing on its own. A working detector and a disabled detector produce identical output. So does a passing test that cannot fail.

Every check has two directions, and most people run one:

1. Positive. It passes on real input.
2. Negative. Break it on purpose and watch it fail.

Direction 2 is the one that gets skipped, and it is the only one that tells you the check is there at all.

Checklist

Run the negative direction before reporting anything.