public void ToString_Date()
{
var value = SqlExpression.Constant(Field.Date(new SqlDateTime(2015, 02, 10)));
var result = Select("TOSTRING", value);
Assert.IsNotNull(result);
Assert.IsInstanceOf<StringType>(result.Type);
var stringResult = result.Value.ToString();
Assert.AreEqual("2015-02-10", stringResult);
}