tst_MacGui::nonModalOrder fails on macOS 10.11

/Users/qt/work/qt/qtbase/tests/auto/other/macgui/target_wrapper.sh  ./tst_macgui nonModalOrder
********* Start testing of tst_MacGui *********
Config: Using QtTest library 5.9.0, Qt 5.9.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 8.0.0 (clang-800.0.42.1) (Apple))
PASS   : tst_MacGui::initTestCase()
XPASS  : tst_MacGui::nonModalOrder() QCOMPARE(primary.frontWidget, primary.secondaryWindow) returned TRUE unexpectedly.
   Loc: [tst_macgui.cpp(194)]
PASS   : tst_MacGui::cleanupTestCase()
Totals: 2 passed, 1 failed, 0 skipped, 0 blacklisted, 3157ms
********* Finished testing of tst_MacGui *********
make: *** [check] Error 1