QTest has functionality to simulate mouse clicks and movements but there is no way to simulate mouse wheel events. Looking at documentation (http://doc.qt.io/qt-5/qtest.html#details) there is not a single mention of "wheel" anywhere.

Suggestion is to add this basic functionality to QTest.

This has been requested recently (https://stackoverflow.com/questions/50996997/how-to-simulate-mouse-wheel-events-using-qtestlib-qt5) and as far back as 10 years ago, in  2008 (https://www.qtcentre.org/threads/13436-Wheel-and-QTest).

Today this request was made formal.

NOTE: If there is a misunderstanding that this functionality is in fact available, then the documentation should be updated on how to do it!