qtquickcontrols::Tests_Slider::test_mouseWheel() fails on Ubuntu 16.04

PASS   : qtquickcontrols::Tests_Slider::test_minimumvalue()
FAIL!  : qtquickcontrols::Tests_Slider::test_mouseWheel() Compared values are not the same
   Actual   (): 17
   Expected (): 16
   Loc: [/home/qt/work/qt/qtquickcontrols/tests/auto/controls/data/tst_slider.qml(170)]
PASS   : qtquickcontrols::Tests_Slider::test_rightLeftKeyPressed()