public virtual void TestGroupByWithElementSelectorSumMax()
{
var list = db.Orders.Where(o => o.CustomerID == "ALFKI").GroupBy(o => o.CustomerID, o => (o.CustomerID == "ALFKI" ? 1 : 1)).Select(g => new { Sum = g.Sum(), Max = g.Max() }).ToList();
AssertValue(1, list.Count);
AssertValue(6, list[0].Sum);
AssertValue(1, list[0].Max);
}