@Test
public void testLengthTransformation_shouldWork() throws Exception {
TransformationDescription desc = getDescriptionForModelBToModelA();
desc.lengthField("testB", "testA", null);
desc.lengthField("elements", "blubA", "size");
installTransformation(desc);
ModelB model = new ModelB();
model.setTestB("Hello");
List<String> elements = new ArrayList<String>();