code: public void testUpdate_CompareDeletes(){
    GetDeleteTracker.DeleteCompare res=null;
    res=dt.compareDeletes(del10,del10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_BOTH,res);
    res=dt.compareDeletes(del10,del11);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_OLD,res);
    res=dt.compareDeletes(del11,del10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_NEW_NEXT_NEW,res);
    res=dt.compareDeletes(del10,del20);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_NEW_NEXT_NEW,res);
    res=dt.compareDeletes(del20,del10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_OLD,res);
    res=dt.compareDeletes(delQf10,delQf10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_BOTH,res);
    res=dt.compareDeletes(delQf10,delQf11);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_OLD,res);
    res=dt.compareDeletes(delQf11,delQf10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_NEW_NEXT_NEW,res);
    res=dt.compareDeletes(delQf10,delQf20);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_NEW_NEXT_BOTH,res);
    res=dt.compareDeletes(delQf20,delQf10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_BOTH,res);
    res=dt.compareDeletes(del10,delQf10);
    assertEquals(DeleteTracker.DeleteCompare.NEXT_OLD,res);
    res=dt.compareDeletes(delQf10,del10);
    assertEquals(DeleteTracker.DeleteCompare.NEXT_NEW,res);
    res=dt.compareDeletes(del10,delQf11);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_OLD,res);
    res=dt.compareDeletes(delQf11,del10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_NEW_NEXT_NEW,res);
    res=dt.compareDeletes(del11,delQf10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_NEW_NEXT_NEW,res);
    res=dt.compareDeletes(delQf10,del11);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_OLD,res);
    res=dt.compareDeletes(del20,delQf10);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_OLD_NEXT_OLD,res);
    res=dt.compareDeletes(delQf10,del20);
    assertEquals(DeleteTracker.DeleteCompare.INCLUDE_NEW_NEXT_NEW,res);
    res=dt.compareDeletes(del10,delQf20);
    assertEquals(DeleteTracker.DeleteCompare.NEXT_OLD,res);
    res=dt.compareDeletes(delQf20,del10);
    assertEquals(DeleteTracker.DeleteCompare.NEXT_NEW,res);
  }
  