public void testExportModel() throws ParserConfigurationException, SAXException, FileNotFoundException, IOException {
//load test data
ModelManager mm = ModelManager.getInstance();
//use mm mockup to count the element occurences for export verification
ModelManagerMockUp mmMockUp = ModelManagerMockUp.getInstance();
mmMockUp.convertWaysToEdges();
mm.addObserver(mmMockUp);
//ok, now actually load the .ewd file
PersistenceManager.getInstance().loadFromFile("./resources/export/berlin_test.ewd");