TestCase.compare() does not work with Qt types

import QtQuick 2.0
import QtTest 1.0

TestCase {
    function test_1() {
        compare(Qt.rgba(1, 0, 0, 1), Qt.rgba(0, 1, 0, 1))
        compare(Qt.point(1, 2), Qt.point(3, 4))
        compare(Qt.rect(1, 2, 3, 4), Qt.rect(5, 6, 7, 8))
    }
}