public void SortDescriptionTest()
{
IBindingListView view = new DataView(_table);
ListSortDescriptionCollection col = view.SortDescriptions;
((DataView)view).Sort = "";
col = view.SortDescriptions;
Assert.Equal(0, col.Count);
((DataView)view).Sort = null;
col = view.SortDescriptions;
Assert.Equal(0, col.Count);
((DataView)view).Sort = "col1 DESC, col2 ASC";
col = view.SortDescriptions;
Assert.Equal(2, col.Count);
Assert.Equal("col1", col[0].PropertyDescriptor.Name);
Assert.Equal(ListSortDirection.Descending, col[0].SortDirection);
Assert.Equal("col2", col[1].PropertyDescriptor.Name);
Assert.Equal(ListSortDirection.Ascending, col[1].SortDirection);
//ApplySort Test
IBindingListView view1 = new DataView(_table);
Assert.False(view.Equals(view1));
view1.ApplySort(col);
Assert.Equal("[col1] DESC,[col2]", ((DataView)view1).Sort);
for (int i = 0; i < view.Count; ++i)
Assert.Equal(((DataView)view)[i].Row, ((DataView)view1)[i].Row);
}