Question

How do I test this with JUnit? I watched a video on YouTube about how to create and run a Simple JUnit test in Eclipse IDE but I still don't understand.

Here's what I need to test:

public class ReverseDomainName
{
   public static void main(String[] args)
   {
       String domain = "cs.princeton.edu";
       System.out.println("domain is " + domain);
       System.out.println("reverse of domain is " + rev_domain(domain));
   }
  
   public static String rev_domain(String domain)
   {
       String[] token = domain.split("\\.");
       String ans = "";
       for(int i=token.length-1; i>=0; i--)
       {
           if(i==0)
               ans = ans + token[i];
           else
               ans = ans + token[i] + ".";
       }
               return ans;      
   }  
}

And here's what I have after watching a tutorial video:

import static org.junit.Assert.*;

import org.junit.Test;

public class ReverseDomainNameTest
{

   @Test
   public void revTest()
   {
       ReverseDomainName junit = new ReverseDomainName();
       String result = junit.rev_domain
   }

}

Answer 1

JUNIT Test File to run:

import static org.junit.Assert.*;

import org.junit.Test;

public class ReverseDomainNameTest
{

@Test
public void revTest()
{
ReverseDomainName junit = new ReverseDomainName();
String domain="www.abc.com";
String result = junit.rev_domain(domain);
String result1 = junit.rev_domain("WWW.def.com");
assertEquals("com.abc.www",result);
assertEquals("com.def.WWW",result1);

}

}

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