createTemporaryQmlObject import path

[rc2017]

So I've got a SUBDIRS project that has two directories called App and Tests. I've got a Bubba.qml under App, which is something I want to write tests for (in the Tests sub project).

In the Tests project, if I create a tst_Tests.qml file and do:

import QtQuick 2.0
import QtTest 1.0
import "../App"

TestCase {
...
   Bubba {
   }
}

It resolves just fine.

However, if I do what I want to do, which is add a function:

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

It fails in createTemporaryQmlObject with:

test::MathTests::test_bubba
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

Any suggestions on how to get createTemporaryQmlObject to see this relative path, or a different way of having tests separated from the main code?