How to setup Junit in eclipse?

Junit can be setup for eclipse , Netbean indeed for any IDE. we need only junit jar and hammcrest jar in class path.

How Junit Works?

Call the business method get the result, compare the result with expected result. If actual result match with expected result then test is pass else fail.

Example

Suppose we have a method which is responsible for user authentication. we need to pass user id and password if user id and password is correct then method return true else false.

Step 1

Write a method with @Test annotation.

Step 2

call the method which is responsible for user authentication and get the response.

Step 3

Now compare the expected result with actual result.

Step 4

Check the result.

Sample code

Live Demo

MyLogin.java

package com.javaant;

import java.util.Scanner;

public class MyLogin {

	
	public boolean login(String userid,String password){
		
		if(userid=="java" && password=="ant"){
			return true;
		}
		return false;
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scan= new Scanner(System.in);
		String userid=scan.next();
		String password=scan.next();
		MyLogin jt=new MyLogin();
		jt.login(userid,password);
	}

}

TestLogin.java

package com.javaant;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

public class TestLogin {
	
	@Test
	public void testLoginCredentials(){
		MyLogin mlogin= new MyLogin();
		assertEquals(true,mlogin.login("javaant", "java"));		
	}
	@Test
	public void testLoginCredentials1(){
		MyLogin mlogin= new MyLogin();
		assertEquals(true,mlogin.login("java", "ant"));
		
	}
	
	@Test
	public void testLoginCredentials2(){
		MyLogin mlogin= new MyLogin();
		assertEquals(false,mlogin.login("javaant", "java"));
		
	}

}

Jar file required for Junit.

How to run Junit?