tst_qapplication fails on Mac OSX_10.10

 
  QtQA::App::TestRunner: begin tst_qapplication: [./tst_qapplication] [-silent] [-o] [/work/ci/qt/qt5/dev/_artifacts/test-logs/tst_qapplication-testresults-00.xml,xml] [-o] [-,txt]
  Testing tst_QApplication
  FAIL!  : tst_QApplication::quitOnLastWindowClosed() 'spy2.count() > 15' returned FALSE. ()
     Loc: [../tst_qapplication.cpp(743)]
  Totals: 56 passed, 1 failed, 1 skipped, 0 blacklisted
  QtQA::App::TestRunner: test failed, running again to see if it is flaky...
  ********* Start testing of tst_QApplication *********

  Totals: 56 passed, 1 failed, 1 skipped, 0 blacklisted
  ********* Finished testing of tst_QApplication *********
  QtQA::App::TestRunner: test failure could be reproduced twice consecutively
  QtQA::App::TestRunner: end tst_qapplication: 86 seconds, exit code 1
  QtQA::App::TestScheduler: tst_qapplication failed