JUnit Examples

Just JUnit

Calculator.java

package com.dev.junit.test;

public class Calculator {

public int add(int value1, int value2){

return value1+value2;

}

public int substract(int value1, int value2){

return value1-value2;

}

public int multiply(int value1, int value2){

return value1*value2;

}

public int devide(int value1, int value2){

return value1/value2;

}

}

Without Annotations

CalculatorTest.java

package com.dev.junit.test;

import junit.framework.TestCase;

public class CalculatorTest extends TestCase{

Calculator calc = null;

public void setUp(){

// to set up data

// runs before execution of every test case

calc = new Calculator();

}

public void testAdd() {

assertNotNull(calc);

int result = calc.add(4, 2);

assertEquals(6,result);

}

public void testSubstract() {

assertNotNull(calc);

int result = calc.substract(4, 2);

assertEquals(2,result);

}

public void testMultiply() {

assertNotNull(calc);

int result = calc.multiply(4, 2);

assertEquals(8,result);

}

public void testDevide() {

assertNotNull(calc);

int result = calc.devide(4, 2);

assertEquals(2,result);

}

public void tearDown(){

// to remove data

// runs after execution of every test case

}

}

With Annotations

CalculatorTest.java

package com.dev.junit.test;

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

public class CalculatorTest {

Calculator calc = null;

@Before

public void setUp() throws Exception {

// to setup data

// runs before execution of every test case

calc = new Calculator();

}

@After

public void tearDown() throws Exception {

// to remove data

// runs after execution of every test case

}

@Test

public void testAdd() {

assertNotNull(calc);

int result = calc.add(4, 2);

assertEquals(6,result);

}

@Test

public void testSubstract() {

assertNotNull(calc);

int result = calc.substract(4, 2);

assertEquals(2,result);

}

@Test

public void testMultiply() {

assertNotNull(calc);

int result = calc.multiply(4, 2);

assertEquals(8,result);

}

@Test

public void testDevide() {

assertNotNull(calc);

int result = calc.devide(4, 2);

assertEquals(2,result);

}

}