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Jiew Meng
Asked: 2011-10-05 04:03:47 +0800 CST

How to install/use JUnit?

  • 772

I have installed JUnit on my Ubuntu 11.04

sudo apt-get install junit

Then created a test file like: 

import org.junit.*;

public class TestBasicLinkedList {
  @Test public void testCanAdd(String[] args) {
    BasicLinkedList<Integer> list = new BasicLinkedList();
    list.add(new BasicListNode<Integer>(1));
    assertTrue(list.size() == 1);
    assertTrue(list.getFirst().getElement().equals(1));
  }
}

Then tried running in terminal 

java org.junit.runner.JUnitCore TestBasicLinkedList.java

Got: 

Exception in thread "main" java.lang.NoClassDefFoundError: org/junit/runner/JUnitCore
Caused by: java.lang.ClassNotFoundException: org.junit.runner.JUnitCore
    at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: org.junit.runner.JUnitCore. Program will exit.

How do I use JUnit? Is there a better shorter way of using it than the long command java org.junit.runner.JUnitCore TestBasicLinkedList.java? Perhaps something like junit *.Tests.java maybe?

java

3 Answers

  1. To get you up and running, this is a basic test case:

    import junit.framework.TestCase;

public class TestBasicLinkedList extends TestCase {
  public void testTrue() {
    assertTrue(true);
  }
}

    The test class should extend TestCase, and test methods should start with "test", accept no arguments and return void.

    To compile:

    javac -cp /usr/share/java/junit4.jar TestBasicLinkedList.java

    To run:

    java -cp /usr/share/java/junit4.jar:. org.junit.runner.JUnitCore TestBasicLinkedList

    This is for JUnit 4; JUnit 3 uses different classes for executing tests (try junit.textui.TestRunner).

    • 13
  2. Best Answer

    In general, JUnit (just like any Java library) needs to be on your classpath. I don't know where exactly Ubuntu stores junitX.jar, but you probably want something like this:

    java -cp .:/usr/share/java/junit4-4.10.jar TestBasicLinkedList

    You'll need to compile TestBasicLinkedList first.

    • 11 
  3. sudo apt-get install junit4
    • /usr/share/java/junit4.jar is a symlink to the latest junit4 version.
    • /usr/share/java/junit.jar is a symlink to the latest junit3 version.

    If your application requires that you to set $JUNIT_HOME:

    mkdir ~/junit
ln -s /usr/share/java/junit4.jar ~/junit
ln -s /usr/share/java/hamcrest-core.jar ~/junit
export JUNIT_HOME=~/junit

    If your application requires it to have it in your $CLASSPATH:

    Just copy it into one of your application's classpath directories.

    • 2