JUnit - Environment Setup


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Try it Option Online

You really do not need to set up your own environment to start learning Java & JUnit programming language. Reason is very simple, we already have setup Java Programming environment online, so that you can compile and execute all the available examples online at the same time when you are doing your theory work. This gives you confidence in what you are reading and to check the result with different options. Feel free to modify any example and execute it online.

Try following example using Try it option available at the top right corner of the below sample code box:

public class MyFirstJavaProgram {

    public static void main(String []args) {
       System.out.println("Hello World");
    }
} 

For most of the examples given in this tutorial, you will find Try it option, so just make use of it and enjoy your learning.

Local Environment Setup

JUnit is a framework for Java, so the very first requirement is to have JDK installed in your machine.

System Requirement

JDK 1.5 or above.
Memory no minimum requirement.
Disk Space no minimum requirement.
Operating System no minimum requirement.

Step 1 - verify Java installation in your machine

Now open console and execute the following java command.

OS TaskCommand
Windows Open Command Console c:\> java -version
Linux Open Command Terminal $ java -version
Mac Open Terminal machine:~ joseph$ java -version

Let's verify the output for all the operating systems:

OS Output
Windows java version "1.6.0_21"

Java(TM) SE Runtime Environment (build 1.6.0_21-b07)

Java HotSpot(TM) Client VM (build 17.0-b17, mixed mode, sharing)

Linux java version "1.6.0_21"

Java(TM) SE Runtime Environment (build 1.6.0_21-b07)

Java HotSpot(TM) Client VM (build 17.0-b17, mixed mode, sharing)

Mac java version "1.6.0_21"

Java(TM) SE Runtime Environment (build 1.6.0_21-b07)

Java HotSpot(TM)64-Bit Server VM (build 17.0-b17, mixed mode, sharing)

If you do not have Java installed, install the Java Software Development Kit (SDK) from http://www.oracle.com/technetwork/java/javase/downloads/index.html. We are assuming Java 1.6.0_21 as installed version for this tutorial.

Step 2: Set JAVA environment

Set the JAVA_HOME environment variable to point to the base directory location where Java is installed on your machine. For example

OSOutput
Windows Set the environment variable JAVA_HOME to C:\Program Files\Java\jdk1.6.0_21
Linux export JAVA_HOME=/usr/local/java-current
Mac export JAVA_HOME=/Library/Java/Home

Append Java compiler location to System Path.

OS Output
Windows Append the string ;C:\Program Files\Java\jdk1.6.0_21\bin to the end of the system variable, Path.
Linux export PATH=$PATH:$JAVA_HOME/bin/
Mac not required

Verify Java Installation using java -version command explained above.

Step 3: Download Junit archive

Download latest version of JUnit jar file from http://www.junit.org. At the time of writing this tutorial, I downloaded Junit-4.10.jar and copied it into C:\>JUnit folder.

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

Step 4: Set JUnit environment

Set the JUNIT_HOME environment variable to point to the base directory location where JUNIT jar is stored on your machine. Assuming, we've stored junit4.10.jar in JUNIT folder on various Operating Systems as follows.

OS Output
Windows Set the environment variable JUNIT_HOME to C:\JUNIT
Linux export JUNIT_HOME=/usr/local/JUNIT
Mac export JUNIT_HOME=/Library/JUNIT

Step 5: Set CLASSPATH variable

Set the CLASSPATH environment variable to point to the JUNIT jar location. Assuming, we've stored junit4.10.jar in JUNIT folder on various Operating Systems as follows.

OS Output
Windows Set the environment variable CLASSPATH to %CLASSPATH%;%JUNIT_HOME%\junit4.10.jar;.;
Linux export CLASSPATH=$CLASSPATH:$JUNIT_HOME/junit4.10.jar:.
Mac export CLASSPATH=$CLASSPATH:$JUNIT_HOME/junit4.10.jar:.

Step 6: Test JUnit Setup

Create a java class file name TestJunit in C:\ > JUNIT_WORKSPACE

   
import org.junit.Test;
import static org.junit.Assert.assertEquals;
public class TestJunit {
   @Test
   public void testAdd() {
      String str= "Junit is working fine";
      assertEquals("Junit is working fine",str);
   }
}

Create a java class file name TestRunner in C:\ > JUNIT_WORKSPACE to execute Test case(s)

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

public class TestRunner {
   public static void main(String[] args) {
      Result result = JUnitCore.runClasses(TestJunit.class);
      for (Failure failure : result.getFailures()) {
         System.out.println(failure.toString());
      }
      System.out.println(result.wasSuccessful());
   }
}  	

Step 7: Verify the Result

Compile the classes using javac compiler as follows

C:\JUNIT_WORKSPACE>javac TestJunit.java TestRunner.java

Now run the Test Runner to see the result

C:\JUNIT_WORKSPACE>java TestRunner

Verify the output.

true


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