public  void doTest(String jspName) throws Exception 
{
        WebRequest request = new GetMethodWebRequest(jspName);
        ParamEncoder encoder = new ParamEncoder("table");
        request.setParameter(encoder.encodeParameterName(TableTagParameters.PARAMETER_SORT), "1");
        request.setParameter(encoder.encodeParameterName(TableTagParameters.PARAMETER_SORTUSINGNAME), "1");
        WebResponse response = runner.getResponse(request);
        if (log.isDebugEnabled())
        {
            log.debug(response.getText());
        }
        WebTable[] tables = response.getTables();
        assertEquals("Wrong number of tables in result.", 1, tables.length);
        assertEquals("Wrong number of rows in result.", 3, tables[0].getRowCount());
        if (log.isDebugEnabled())
        {
            log.debug(response.getText());
        }
        assertEquals("Wrong value in first row. Table incorrectly sorted?", "2", tables[0].getCellAsText(1, 1));
        assertEquals("Column 1 should not be marked as sorted.", "sortable", tables[0]
            .getTableCell(0, 1)
            .getClassName());
        assertEquals("Column 2 should be marked as sorted.", "sortable sorted order1", tables[0]
            .getTableCell(0, 2)
            .getClassName());
}

Check sorted column.

 public String getJspName() 
{
        return "DISPL-280.jsp";
}