Seems like Enum can be very useful, why didn’t I notice this type before?
enum Days { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday };
[TestMethod]
public void EnumTest()
{
Days today = Days.Monday;
int dayNum = (int)today;
Assert.AreEqual("Monday", today.ToString(), "shoud be Monday");
Assert.AreEqual(1, dayNum, "shoud be 1");
}