createTemporaryQmlObject + importing relative directories

When using createTemporaryQmlObject(), imports in the qml string (first argument) appear not support relative paths, or at least the path it is relative to is not the desired path.

Given a tst_Bubba.qml like this:

function test_bubba() {
        var item = createTemporaryQmlObject("import QtQuick 2.0; import \"../App\"; Bubba {}", testCase);
        compare(item.color, "#ff0000")
        mouseClick(item, 0, 0, Qt.LeftButton);
        compare(item.color, "#00ff00")
}

Where ../App/Bubba.qml exists relative to tst_Bubba.qml, the following error is given:

Uncaught exception: Qt.createQmlObject(): failed to create object:
file:///C:/Qt/Qt5.9.0/5.9/mingw53_32/qml/QtTest/undefined:1:21: "../App": no such directory

If I don't use createTemporaryQmlObject but rather have:

import QtQuick 2.0
import "../App"

Bubba {
}

"Bubba" resolves just fine.