Junit : how to add listener, and how to extends RunListener to override behaviors while failed

org.junit.runner.notification
Class RunListener

java.lang.Object   org.junit.runner.notification.RunListener 

public class RunListener
extends java.lang.Object

If you need to respond to the events during a test run, extend RunListener and override the appropriate methods. If a listener throws an exception while processing a test event, it will be removed for the remainder of the test run.

For example, suppose you have a Cowbell class that you want to make a noise whenever a test fails. You could write:

 public class RingingListener extends RunListener {
    public void testFailure(Failure failure) {
       Cowbell.ring();
    }
 }

To invoke your listener, you need to run your tests through JUnitCore.

 public void main(String... args) {
    JUnitCore core= new JUnitCore();
    core.addListener(new RingingListener());
    core.run(MyTestClass.class);
 }