@Test
public void testDatabaseMgr1() {

    TDBInternal.reset();
    DatasetGraph dg1 = DatabaseMgr.connectDatasetGraph(Location.mem("FOO"));
    DatasetGraph dg2 = DatabaseMgr.connectDatasetGraph(Location.mem("FOO"));
    Txn.executeWrite(dg1, ()->{
        dg1.add(quad1);
    });
    Txn.executeRead(dg2, ()->{
        assertTrue(dg2.contains(quad1));
    });
}