Huh. That never occurred to me (even though I spend a lot of my days writing code too).
In case you're expressing actual uncertainty rather than merely what your brain gets confused about, the answer is that a false positive is something that falsely looks positive. Perhaps the best way to put it is different, though: a false positive is a positive result of your test (so it actually is a positive) that doesn't match the underlying reality. Like a "false alarm".
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.