public void AddDate_Day()
{
var date = new SqlDateTime(1980, 02, 05, 18, 20, 11, 32);
var value = Select("ADD_DATE", SqlExpression.Constant(date), SqlExpression.Constant("day"),
SqlExpression.Constant(2));
Assert.IsNotNull(value);
Assert.IsFalse(value.IsNull);
Assert.IsInstanceOf<DateType>(value.Type);
Assert.IsInstanceOf<SqlDateTime>(value.Value);
// TODO: Assert result
}