}
public void testAllCollapseMapping()
{
final GroupModel model = new GroupModel();
final GroupingHeader header1 = new GroupingHeader("1");
header1.setCollapsed(true);
final GroupingHeader header2 = new GroupingHeader("2");
header2.setCollapsed(true);
final GroupingHeader header3 = new GroupingHeader("3");
header3.setCollapsed(true);
final GroupingHeader header4 = new GroupingHeader("4");
header4.setCollapsed(true);
model.add(header1, null);
model.add(header1, "1a");
model.add(header2, null);
model.add(header2, "2a");