extras::Tests_CircularTickmarkLabel::test_tickmarksAndLabels() failed

/home/qt/work/qt/qtquickcontrols/tests/auto/extras/target_wrapper.sh  ./tst_extras Tests_CircularTickmarkLabel::test_tickmarksAndLabels
 ********* Start testing of extras *********
 Config: Using QtTest library 5.8.0, Qt 5.8.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by GCC 4.8.2)
 PASS   : extras::Tests_CircularTickmarkLabel::initTestCase()
 FAIL!  : extras::Tests_CircularTickmarkLabel::test_tickmarksAndLabels() Compared values are not the same
    Actual   (): 0
    Expected (): -0.5729577951308232
    Loc: [/home/qt/work/qt/qtquickcontrols/tests/auto/extras/data/tst_circulartickmarklabel.qml(147)]
 PASS   : extras::Tests_CircularTickmarkLabel::cleanupTestCase()
 Totals: 2 passed, 1 failed, 0 skipped, 0 blacklisted, 505ms
 ********* Finished testing of extras *********

import QtQuick 2.2
import QtQuick.Extras 1.4;
import QtQuick.Extras.Private 1.0;

CircularTickmarkLabel {
    function findChild(parent, childObjectName) {
        if (!parent)
            return null;

        for (var i = 0; i < parent.children.length; ++i) {
            // Is this direct child of ours the child we're after?
            var child = parent.children[i];
            if (child.objectName === childObjectName)
                return child;

            // Try the direct child's children.
            child = findChild(parent.children[i], childObjectName);
            if (child)
                return child;
        }
        return null;
    }

    Component.onCompleted: {
        minimumValueAngle = 0;
        maximumValueAngle = 180;

        maximumValue = 220;
        tickmarkStepSize = 10;
        labelStepSize = 40;
        var tickmark = findChild(__panel, "tickmark0");
        console.log(tickmark);
        console.log(tickmark.transform[1].angle)
    }
}