JUnit 4.x – Testing Framework : JUnit Example

• JUnit First Example
• Downloads Examples

Calculator class that helps to add two number.

Calculator.java

package com.javaskool;

public class Calculator {
	
	public int add(int a,int b)
	{
		return a+b;
	}
}

CalculatorMesg class that helps to display message.

CalculatorMesg.java

package com.javaskool;

public class CalculatorMesg {

	public String addMesg()
	{
		return "Addition";
	}	
}

CalcTest class that helps to test my Calculator class.

CalcTest.java

package com.javaskool;

import static org.junit.Assert.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

public class CalcTest {

	@Before
	public void setUp() throws Exception {
		System.out.println("Before");
	}

	@After
	public void tearDown() throws Exception {
		System.out.println("After");
	}

	@Test
	public void testAdd() {
			
		Calculator c=new Calculator();
		int x=c.add(50, 20);
		assertEquals(70, x);	
		System.out.println(x);		
	}
}

CalcMesgTest class that helps to test my CalculatorMesg class.

CalcMesgTest.java

package com.javaskool;

import static org.junit.Assert.*;

import org.junit.Test;

public class CalcMesgTest {

	@Test
	public void test() {
			
		CalculatorMesg m=new CalculatorMesg();
		String s=m.addMesg();
		assertEquals("Addition", s);	
		System.out.println(s +" :  ");		
	}
}

MyJUnitTestSuite class using annotation that helps to test both Calculator and CalculatorMesg class together as test suite.

MyJUnitTestSuite.java

package com.javaskool;

import org.junit.runner.RunWith;
import org.junit.runners.Suite;

@RunWith(Suite.class)
@Suite.SuiteClasses({
	CalcMesgTest.class,
	CalcTest.class
	
})

public class MyJUnitTestSuite {

}

MyTestRunner Java Application that helps to test both Calculator and CalculatorMesg class together as test suite.

MyTestRunner.java

package com.javaskool;

import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;

public class MyTestRunner {

	public static void main(String[] args) {
		
		Result result = JUnitCore.runClasses(MyJUnitTestSuite.class); 
	      for (Failure failure : result.getFailures()) {
	         System.out.println(failure.toString());
	      }
	      System.out.println(result.wasSuccessful()); //return true or false 
	}
}

Click here to Download First JUnit Framework Basic Example