qmltest::TextInput::test_doublevalidators() failed on OS X 10.11

~/qt/qt5-build/qtdeclarative/tests/auto/qmltest$ make check
/Users/liangqi/qt/qt5-build/qtdeclarative/tests/auto/qmltest/target_wrapper.sh  ./tst_qmltest 
********* Start testing of qmltest *********
Config: Using QtTest library 5.6.1, Qt 5.6.1 (x86_64-little_endian-lp64 shared (dynamic) debug build; by Clang 7.3.0 (clang-703.0.31) (Apple))
...
PASS   : qmltest::TextInput::test_doublevalidators(toolow)
PASS   : qmltest::TextInput::test_doublevalidators(toohigh)
FAIL!  : qmltest::TextInput::test_doublevalidators(onlowerbounds) Compared values are not the same
   Actual   (): false
   Expected (): true
   Loc: [/Users/liangqi/qt/qt5/qtdeclarative/tests/auto/qmltest/textinput/tst_textinput.qml(283)]
FAIL!  : qmltest::TextInput::test_doublevalidators(onupperbounds) Compared values are not the same
   Actual   (): false
   Expected (): true
   Loc: [/Users/liangqi/qt/qt5/qtdeclarative/tests/auto/qmltest/textinput/tst_textinput.qml(283)]
FAIL!  : qmltest::TextInput::test_doublevalidators(middle) Compared values are not the same
   Actual   (): false
   Expected (): true
   Loc: [/Users/liangqi/qt/qt5/qtdeclarative/tests/auto/qmltest/textinput/tst_textinput.qml(283)]
PASS   : qmltest::TextInput::test_doublevalidators(negativemiddle)
...
********* Finished testing of qmltest *********