@Test
public void testGetIdentifier()
{

    DataElementGroup oA = new DataElementGroup();
    DataElementGroup oB = new DataElementGroup();
    DataElementGroup oC = new DataElementGroup();
    oA.setUid( "a1" );
    oB.setUid( "b1" );
    oC.setUid( "c1" );
    List<DimensionalItemObject> column = new ArrayList<>();
    column.add( oC );
    column.add( oA );
    List<DimensionalItemObject> row = new ArrayList<>();
    row.add( oB );
    assertEquals( "a1-b1-c1", DimensionalObjectUtils.getKey( column, row ) );
    assertEquals( "b1", DimensionalObjectUtils.getKey( new ArrayList<>(), row ) );
}