Question

c#

Please write unit tests for this code, at least one or two that I can understand how to write it.

using System;

namespace PrimeNumberFactors
{
class Program
{
static void Main(string[] args)
{

Console.Write("Enter a number you want to check: ");
  
if (int.TryParse(Console.ReadLine(), out int num))
{
PrimeFactors(num);
}
else
{
Console.WriteLine("Invalid input!!");
}
Console.ReadKey();
}

public static void PrimeFactors(int num)
{
Console.Write($"Prime Factors of {num} are: ");

  
while (num % 2 == 0)
{
Console.Write("2 ");
num /= 2;
}

for (int i = 3; i <= Math.Sqrt(num); i += 2)
{
while (num % i == 0)
{
Console.Write($"{i} ");
num /= i;
}
}

if (num > 2)
{
Console.Write($"{num} ");
}
}

}
}   

Answer 1

Short Summary:

• PrimeFactors method does not return any values, it just wirtes the values on console screen, You cannot test the methods using unit test project.
• So I have provided manual test cases and results
• Let me know if you want to create unit test project which requires code changes in your method

Solution:

Unit Test 1: Enter string characters - passed

Unit Test 2: Enter 0   ( 0 is neither prime or composite, it does not have any factors) – failed, it is in endless loop.

Unit Test 3: Enter 1 (it does not have any factors)

Unit Test 4: Enter 2

Unit Test 5: Enter 3

Unit Test 5: Enter 50

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