JUnit - Plug with Eclipse


To setup JUnit with eclipse following steps need to be followed

Step 1: Download Junit archive

Download JUnit

OS Archive name
Windows junit4.10.jar
Linux junit4.10.jar
Mac junit4.10.jar

Assume you copied above JAR file in C:\>JUnit folder.

Step 2: Set Eclipse environment

  • Open eclipse -> right click on project and click on property > Build Path > Configure Build Path and add the junit-4.10.jar in the libraries using Add External Jar button.

Add junit-4.10.jar in liraries.
  • We assume that your eclipse has inbuilt junit plugin if it is not available in C:\>eclipse/plugins directory, then you can download it from JUnit Plugin. Unzip the downloaded zip file in the plugin folder of the eclipse. Finally restart eclipse.

Now your eclipse is ready for the development of JUnit test cases.

Step 3: Verify Junit installation in Eclipse

  • Create a projet TestJunit in eclipse at any location.

  • Create a class MessageUtil to test in the project

* This class prints the given message on console.
public class MessageUtil {

   private String message;

   //@param message to be printed
   public MessageUtil(String message){
      this.message = message;
   // prints the message
   public String printMessage(){
      return message;
  • Create a test class TestJunit in the project

import org.junit.Test;
import static org.junit.Assert.assertEquals;

public class TestJunit {
   String message = "Hello World";	
   MessageUtil messageUtil = new MessageUtil(message);

   public void testPrintMessage() {	  

Following should be the project structure

Project Structure

Finally, verify the output of the program by right click on program and run as junit

Run Junit

Verify the result

Junit result success.