What does it measure?
It checks whether wheel-event direction is consistent in each direction. Delta magnitude alone is not treated as a fault.
Mouse · Controlled scroll
Scroll Reverse-Direction Test
Scroll down first, then up. Testarya does not treat one reverse event as a fault; if direction mixing appears, it looks for the same behavior again in a second round.
Clearer result
Open guided check →Does the scroll problem actually repeat?
Check down and up separately; if needed, use a confirmation round instead of treating one odd event as a fault.
Downward direction
Scroll down only at a normal speed.Scroll down
After starting the test, scroll only in the requested direction.
Direction consistency will be monitored0 / 18
Result
Show technical details
Delta magnitude can be affected by the operating system and smooth scrolling; direction consistency is the primary signal.
Why test both directions?
An encoder issue may appear more strongly in one direction. Sampling down and up separately is more meaningful.
Why repeat?
If mixed-direction signals appear in the first round, a confirmation round is requested automatically. One reverse event does not determine the result.
Limitations
Touchpads and high-resolution smooth scrolling can produce different event patterns.