protected void setUp() throws Exception {
   super.setUp();
   final Mapping m = getMapping();
   myTransformer = new DiagramGenModelTransformer(myDiagramModelHelper);
   myTransformer.setEMFGenModel(Utils.createGenModel(m.getDiagram().getDomainModel()));
   myTransformer.transform(m);
   myTransformationResult = myTransformer.getResult();
 }