tst_QWidget::setToolTip() fails on OS X 10.9

I have looked at build logs between QtBase_5.5_Integration/build_00987 and QtBase_5.5_Integration/build_587 and tst_QWidget::setToolTip() starts failing since build_00942 (11/05) with error:

FAIL!  : tst_QWidget::setToolTip() Compared values are not the same
     Actual   (spy1.count()): 0
     Expected (1)           : 1
     Loc: [tst_qwidget.cpp(5643)]

http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00987/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00985/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00984/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00981/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00975/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00974/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00968/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00965/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00964/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00962/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00950/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same
http://testresults.qt.io/ci/QtBase_5.5_Integration/build_00942/macx-clang_developer-build_OSX_10.9
FAIL!+:+tst_QWidget::setToolTip()+Compared+values+are+not+the+same