tst_qquickmenubar::mouse() fails for all styles on Ubuntu 16.04 CI machines

 PASS   : tst_qquickmenubar::Imagine::mouse()
 PASS   : tst_qquickmenubar::Imagine::cleanupTestCase()
 PASS   : tst_qquickmenubar::Material::initTestCase()
 FAIL!  : tst_qquickmenubar::Material::mouse() 'editMenuBarItem->isHighlighted()' returned FALSE. ()
    Loc: [tst_qquickmenubar.cpp(111)]
 PASS   : tst_qquickmenubar::Material::cleanupTestCase()
 PASS   : tst_qquickmenubar::Universal::initTestCase()
 PASS   : tst_qquickmenubar::Universal::mouse()
 PASS   : tst_qquickmenubar::Universal::cleanupTestCase()
 Totals: 12 passed, 3 failed, 0 skipped, 0 blacklisted, 2297ms
 ********* Finished testing of tst_qquickmenubar *********
 Makefile:325: recipe for target 'check' failed
 make: *** [check] Error 11