Run QtQuick tests from main.cpp

[LongJohn]

how can I run tests for QtQuick-Applications in the main.cpp? The main.qml have a rectangle and inside some buttons. The test class MouseClick.qml implements the javascript test functions who should push the buttons.
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int main(int argc, char *argv[])
{
QGuiApplication app(argc, argv);

QTestCase = QTestCase(MouseClick); //????

QtQuick2ApplicationViewer viewer;
viewer.setMainQmlFile(QStringLiteral("qml/TestApp/main.qml"));
viewer.showExpanded();

return app.exec();

}
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