example::tst_qml-qtquicktest BoxPlotSeries fails in qt5.git integration

Continuous Integration: Failed

The test execution failed ('C:/Users/qt/work/qt/qtcharts/tests/auto/qml-qtquicktest'). The CI rejected the staged commits due to the beforementioned reason. Possible reason could be a bug in one of the commits or some more recent change. Please investigate it.

The error was in "qt/qtcharts", revision: 9da68921e4bfb9c362600832b23128d488dc7aff

Could not parse build log for execution phase testing C:/Users/qt/work/qt/qtcharts/tests/auto/qml-qtquicktest

Build log: https://testresults.qt.io/logs/qt/qtcharts/8accc2edafc9ac6f7d46f76d3db354cf3aca2d77/WindowsWindows_10x86_64WindowsWindows_10x86MSVC2017qtci-windows-10-x86_64-10-32e176DebugAndRelease_Release_ForceDebugInfo_OpenGLDynamic/6c70b07dde3334eaff86936868f04a44f6b79735/test_1550662455/log.txt.gz

Details: https://testresults.qt.io/coin/integration/qt/qt5/tasks/1550662112

Tested changes (refs/builds/qtci/5.12/1550662111):
https://codereview.qt-project.org/#/q/23876cf9100dd23c5286c81d47fac9c6e47e3b3d,n,z Update submodules on '5.12' in qt5

From log:

agent:2019/02/20 11:47:46 build.go:192: FAIL! : example::tst_qml-qtquicktest BoxPlotSeries::test_append() Uncaught exception: Could not convert argument 1.
agent:2019/02/20 11:47:46 build.go:192: C:\Users\qt\work\qt\qtcharts\tests\auto\qml-qtquicktest\tst_boxplotseries.qml(61) : failure location
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries::test_properties()
agent:2019/02/20 11:47:46 build.go:192: FAIL! : example::tst_qml-qtquicktest BoxPlotSeries::test_remove() Uncaught exception: Could not convert argument 1.
agent:2019/02/20 11:47:46 build.go:192: C:\Users\qt\work\qt\qtcharts\tests\auto\qml-qtquicktest\tst_boxplotseries.qml(74) : failure location
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries::test_setproperties()
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries::cleanupTestCase()
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 1.3::initTestCase()
agent:2019/02/20 11:47:46 build.go:192: FAIL! : example::tst_qml-qtquicktest BoxPlotSeries 1.3::test_append() Uncaught exception: Could not convert argument 1.
agent:2019/02/20 11:47:46 build.go:192: C:\Users\qt\work\qt\qtcharts\tests\auto\qml-qtquicktest\tst_boxplotseries_1_3.qml(58) : failure location
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 1.3::test_properties()
agent:2019/02/20 11:47:46 build.go:192: FAIL! : example::tst_qml-qtquicktest BoxPlotSeries 1.3::test_remove() Uncaught exception: Could not convert argument 1.
agent:2019/02/20 11:47:46 build.go:192: C:\Users\qt\work\qt\qtcharts\tests\auto\qml-qtquicktest\tst_boxplotseries_1_3.qml(69) : failure location
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 1.3::test_setproperties()
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 1.3::cleanupTestCase()
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 1.4::initTestCase()
agent:2019/02/20 11:47:46 build.go:192: FAIL! : example::tst_qml-qtquicktest BoxPlotSeries 1.4::test_append() Uncaught exception: Could not convert argument 1.
agent:2019/02/20 11:47:46 build.go:192: C:\Users\qt\work\qt\qtcharts\tests\auto\qml-qtquicktest\tst_boxplotseries_1_4.qml(61) : failure location
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 1.4::test_properties()
agent:2019/02/20 11:47:46 build.go:192: FAIL! : example::tst_qml-qtquicktest BoxPlotSeries 1.4::test_remove() Uncaught exception: Could not convert argument 1.
agent:2019/02/20 11:47:46 build.go:192: C:\Users\qt\work\qt\qtcharts\tests\auto\qml-qtquicktest\tst_boxplotseries_1_4.qml(74) : failure location
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 1.4::test_setproperties()
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 1.4::cleanupTestCase()
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 2.0::initTestCase()
agent:2019/02/20 11:47:46 build.go:192: FAIL! : example::tst_qml-qtquicktest BoxPlotSeries 2.0::test_append() Uncaught exception: Could not convert argument 1.
agent:2019/02/20 11:47:46 build.go:192: C:\Users\qt\work\qt\qtcharts\tests\auto\qml-qtquicktest\tst_boxplotseries_2_0.qml(61) : failure location
agent:2019/02/20 11:47:46 build.go:192: PASS : example::tst_qml-qtquicktest BoxPlotSeries 2.0::test_properties()
agent:2019/02/20 11:47:46 build.go:192: FAIL! : example::tst_qml-qtquicktest BoxPlotSeries 2.0::test_remove() Uncaught exception: Could not convert argument 1.
agent:2019/02/20 11:47:46 build.go:192: C:\Users\qt\work\qt\qtcharts\tests\auto\qml-qtquicktest\tst_boxplotseries_2_0.qml(74) : failure location

It seems https://codereview.qt-project.org/#/c/253381/3 is causing this test failure