@Test
public void testTxn() {
assertEquals (3, countRDFNodes()) ;
StoreConnection sc = StoreConnection.make(location) ;
DatasetGraphTxn dsg = sc.begin(ReadWrite.WRITE) ;
assertTrue(dsg.contains(quad1)) ;
dsg.add(quad2) ;
dsg.commit() ;
dsg.end() ;
StoreConnection.release(location) ;