@After
 public void tearDown() throws Exception {
   NodeReference getNdRef = grfToTest.getGraphRootNodeRef();
   Connection extConn = grfToTest.getGlobalsConnection();
   grfToTest = null;
   getNdRef.setSubscriptCount(0);
   getNdRef.kill();
   getNdRef = null;
   extConn.close();
 }