public virtual void TestOrderByGroupBySelectMany()
{
var list = db.Orders.Where(o => o.CustomerID == "ALFKI").OrderBy(o => o.OrderID).GroupBy(o => o.CustomerID).SelectMany(g => g).ToList();
AssertValue(6, list.Count);
var sorted = list.OrderBy(o => o.OrderID).ToList();
Assert.IsTrue(Enumerable.SequenceEqual(list, sorted));
}