@Test
public void testToHtml()
{

    TableRow tr = new TableRow();
    assertEquals("<tr></tr>",tr.toHtml());
    tr.setColumns(columns);
    assertEquals("<tr></tr>",tr.toHtml());
    tr.getColumns().add(new TableData("foo"));
    assertEquals("<tr><td>foo</td></tr>",tr.toHtml());
}