public void TestMinDate()
{
var n = DbEntry.From <DateAndTime>().Where(Condition.Empty).GetMinDate(p => p.dtValue);
Assert.AreEqual(DateTime.Parse("2004-8-19 18:51:06"), n);
n = DateAndTime.GetMinDate(Condition.Empty, p => p.dtValue);
Assert.AreEqual(DateTime.Parse("2004-8-19 18:51:06"), n);
var x = DateAndTime.GetMinDate(p => p.Id > 100, p => p.dtValue);
Assert.IsNull(x);
}