JUnit-Java Tutorials by Examples

Software environments:

JDK

Eclipse

JUnit jars or library

Let’s discusses in details about Java, JUnit implementations step by step:

How to crate java project in Eclipse?

Open the Eclipse

File > New > Java Project

Enter the:

Project name: JUnit-TutorialByExample-Java

Select the JRE

JavaSE-1.7

Click on the Next

Click on the Finish.

How to add JUnit library in JUnit-TutorialByExample-Java project?

Right click on the JUnit-TutorialByExample-Java

Build path

Add Librarys

Select JUnit

Click Next

Select JUnit 3 or JUnit4

Click Finish.

junit.jar will added in JUnit-TutorialByExample-Java.

How to add JavaJUnit.java in JUnit-TutorialByExample-Java project?

Right click on the src folder under JUnit-TutorialByExample-Java

Click on the New

Click on Class

Enter the package name: com.tutorialbyexample

Enter the Name: JavaJUnit

Click on the Finish.

JavaJUnit.java

package com.tutorialbyexample;

/****************************************************************/
/* This class is used for just doing the junit implementations */
/* Created by: Vinod Kumar
/* Created on:*/
/***************************************************************/

public class JavaJUnit {

 /*
  * This method accept String args and return the String.
  */
 public String whyJavaJUnit(String sArg) {
  return sArg;
 }
}

How to add the JUnit Test class JavaJUnitTest.java in JUnit-TutorialByExample-Java project?

Right click on the JavaJUnit.java file under JUnit-TutorialByExample-Java

Click on the New

Click on junit Test Case

Enter the package name: com.tutorialbyexample

Enter the Name: JavaJUnitTest

Select JUnit TestFixtures:

setUpBeforeClass()

tearDownAfterClass()

setUp()

tearDown()

Click on the Finish.

Or

Right click on the src folder under JUnit-TutorialByExample-Java

Click on the New

Click on Class

Enter the package name: com.tutorialbyexample

Enter the Name: JavaJUnitTest

Click on the Finish.

JavaJUnitTest.java

package com.tutorialbyexample;

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

/**
 * @author Vinod Kumar
 *  
 */
public class JavaJUnitTest {

 private JavaJUnit objJavaJUnit;

 /**
  * @throws java.lang.Exception
  */
 @BeforeClass
 public static void setUpBeforeClass() throws Exception {
 }

 /**
  * @throws java.lang.Exception
  */
 @AfterClass
 public static void tearDownAfterClass() throws Exception {

 }

 /**
  * @throws java.lang.Exception
  */
 @Before
 public void setUp() throws Exception {
  objJavaJUnit = new JavaJUnit();
 }

 /**
  * @throws java.lang.Exception
  */
 @After
 public void tearDown() throws Exception {
  objJavaJUnit = null;
 }

 /**
  * Test method for
  * {@link com.tutorialbyexample.JavaJUnit#whyJavaJUnit(java.lang.String)}.
  */
 @Test
 public void testWhyJavaJUnit() {
  assertEquals(objJavaJUnit.whyJavaJUnit("Object Oriented"),
    "Object Oriented");
 }

 /**
  * Test method for
  * {@link com.tutorialbyexample.JavaJUnit#whyJavaJUnit(java.lang.String)}.
  */
 @Test
 public void testWhyJavaJUnit_NotEquals() {
  assertNotEquals(new Integer("1"), objJavaJUnit.whyJavaJUnit("Object Oriented"));
 }

}

How to add JUnit Test Suite in JUnit-TutorialByExample-Java project?

Right click on the JUnit-TutorialByExample-Java

Click on New

Click other

Type JUnit

Select JUnit Test Suit

Click Next

Select Test Methods > JavaJUnitTest

Click Finish.

AllTests.java Test Suit will be created:

package com.tutorialbyexample;

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

@RunWith(Suite.class)
@SuiteClasses({ JavaJUnitTest.class })
public class AllTests {
}

How to run Test classes by Test Suit?

Right click on the AllTests.java

Click on the Run As

Click on the JUnit Test

Project structure:

Done JUnit for Java step by step in http://www.tutorialbyexample.com!!!

References:

http://junit.org/