DefaultTableColumnModel tcm = new DefaultTableColumnModel();
TableColumn tc0 = new TableColumn(0, 10);
tc0.setHeaderValue("XYZ0");
tcm.addColumn(tc0);
tcm.addColumn(new TableColumn(1, 20));
tcm.addColumn(new TableColumn(2, 30));
JTable t = new JTable(tm, tcm);
JTableHeader th = t.getTableHeader();
AccessibleContext ac = th.getAccessibleContext();
harness.check(ac.getAccessibleName(), null);
harness.check(ac.getAccessibleRole(), AccessibleRole.PANEL);