modelManager.addModelElement(pos1);
PersistenceManager.getInstance().saveToFile(EWD_FILE);
// restore
modelManager.clearModel();
PersistenceManager.getInstance().loadFromFile(EWD_FILE);
for (ModelElement modelElement : modelManager.getAllModelElements()) {
GlobalPosition restoredPos1 = (GlobalPosition)modelElement;
Assert.assertEquals(pos1.getLatitude(), restoredPos1.getLatitude(), 0.0001);
}