@Before
 public void setUp() throws Exception {
   pam = new MockPAM();
   tr = new BasicTranslator(SIZE, pam);
   ns = new NodeStructureImpl();
   Node n = new NodeImpl();
   n.setId(10);
   ns.addDefaultNode(n);
   n = new NodeImpl();
   n.setId(20);
   ns.addDefaultNode(n);
   vector = new BitVector(SIZE);
   vector.set(10);
   vector.set(20);
 }
 @Test
 public void testTranslateNodeStructure() {
   NodeStructure nss = tr.translate(vector);
   assert (nss.getNodes().equals(ns.getNodes()));
 }