Testing an ASP.NET MVC using XUnit-Part 2

3 min readMay 12, 2021

In this section we talk about unit test and development of a program in which we use unit testing:

What is Unit Testing?

Let’s try to find the exact definition of the Unit.

UNIT

In this IT world a unit refers to simply a smallest piece of code which takes an input ,does certain operation, and gives an output , And testing this small piece of code is called Unit Testing.

Write your first tests

National code validation method:

We consider the tenth digit of the national number (from the left) as TempA. Consider a value of TempB and set it to =

(First digit * 10) + (second digit * 9) + (third digit * 8) + (fourth digit * 7) + (fifth digit * 6) + (sixth digit * 5) + (seventh digit * 4) + ( Eighth digit * 3) + (Ninth digit * 2)

Set the value of TempC to = TempB — (TempB / 11) * 11.

If the value of TempC is zero and the value of TempA is equal to TempC, the national code is correct. If the value of TempC is 1 and the value of TempA is 1, the national code is correct. If the value of TempC is greater than 1 and the value of TempA is equal to 11 — TempC, the national code is correct.

The following is a method written in C # .NET.

public static class Helpers
    {
        /// <summary>
        /// Check Validation of National code
        /// </summary>
        /// <param name="nationalCode">National code </param>
        /// <returns>
        /// if (nationalcode is valid) return true 
else return false        /// </returns>
        /// <exception cref="System.Exception"></exception>
        public static Boolean IsValidNationalCode(this String nationalCode)
        {
           //if natinal code is empty

            if (String.IsNullOrEmpty(nationalCode))
                throw new Exception("insert valid national code");


            //length of national code is less than 10
            if (nationalCode.Length != 10)
                throw new Exception("lenth of national code equal 10");

            //all character must number in national code
            var regex = new Regex(@"\d{10}");
            if (!regex.IsMatch(nationalCode))
                throw new Exception("enter valide national code ");

            //if all numbers is same
            var allDigitEqual = new[]{"0000000000","1111111111","2222222222","3333333333","4444444444","5555555555","6666666666","7777777777","8888888888","9999999999"};
            if (allDigitEqual.Contains(nationalCode)) return false;

            var chArray = nationalCode.ToCharArray();
            var num0 = Convert.ToInt32(chArray[0].ToString())*10;
            var num2 = Convert.ToInt32(chArray[1].ToString())*9;
            var num3 = Convert.ToInt32(chArray[2].ToString())*8;
            var num4 = Convert.ToInt32(chArray[3].ToString())*7;
            var num5 = Convert.ToInt32(chArray[4].ToString())*6;
            var num6 = Convert.ToInt32(chArray[5].ToString())*5;
            var num7 = Convert.ToInt32(chArray[6].ToString())*4;
            var num8 = Convert.ToInt32(chArray[7].ToString())*3;
            var num9 = Convert.ToInt32(chArray[8].ToString())*2;
            var a = Convert.ToInt32(chArray[9].ToString());

            var b = (((((((num0 + num2) + num3) + num4) + num5) + num6) + num7) + num8) + num9;
            var c = b%11;

            return (((c < 2) && (a == c)) || ((c >= 2) && ((11 - c) == a)));
        }
    }