public void Columns()
{
DataTable dtParent = DataProvider.CreateParentDataTable();
UniqueConstraint uc = null;
uc = new UniqueConstraint(dtParent.Columns[0]);
// Columns 1
Assert.Equal(1, uc.Columns.Length);
// Columns 2
Assert.Equal(dtParent.Columns[0], uc.Columns[0]);
}