public void TestColumnEdit()
{
var column = new DataGridColumn();
column.Edit();
_grid.Columns(column);
var result = new Str();
result.Add("<table class=\"easyui-etreegrid\">");
result.Add("<thead><tr>");
result.Add(column.ToHtmlString());
result.Add("</tr></thead>");
result.Add("</table>");
Assert.AreEqual(result.ToString(), _grid.ToHtmlString());
}