public void NullsValid()
 {
     var attribute = new InAttribute("Jan", "Feb", "Mar");
     ValidationAssert.IsValid(attribute, this, "NullString");
 }
 public void ValidMonthIsValid()
 {
     var attribute = new InAttribute("Jan", "Feb", "Mar");
     ValidationAssert.IsValid(attribute, this, "ValidMonth");
 }
 public void InvalidMonthNotValid()
 {
     var attribute = new InAttribute("Jan", "Feb", "Mar");
     ValidationAssert.IsNotValid(attribute, this, "InvalidMonth");
 }