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JUnit is a regression testing framework written by Erich Gamma and Kent Beck. It is used by the developer who implements unit tests in Java.

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package org.junit.tests;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import junit.framework.TestCase;
import org.junit.Test;
import org.junit.runner.Description;
import org.junit.runner.JUnitCore;
import org.junit.runner.notification.RunListener;

public class RunnerTest {

	private boolean wasRun;

	public class MyListener extends RunListener {

		int testCount;

		@Override
		public void testRunStarted(Description description) {
			this.testCount= description.testCount();
		}
	}
	
	public static class Example {
		@Test public void empty() {
		}
	}
	
	@Test public void newTestCount() {
		JUnitCore runner= new JUnitCore();
		MyListener listener= new MyListener();
		runner.addListener(listener);
		runner.run(Example.class);
		assertEquals(1, listener.testCount);
	}
	
	public static class ExampleTest extends TestCase {
		public void testEmpty() {
		}
	}
	
	@Test public void oldTestCount() {
		JUnitCore runner= new JUnitCore();
		MyListener listener= new MyListener();
		runner.addListener(listener);
		runner.run(ExampleTest.class);
		assertEquals(1, listener.testCount);
	}
	
	public static class NewExample {
		@Test public void empty() {
		}
	}
	
	@Test public void testFinished() {
		JUnitCore runner= new JUnitCore();
		wasRun= false;
		RunListener listener= new MyListener() {
			@Override
			public void testFinished(Description description) {
				wasRun= true;
			}
		};
		runner.addListener(listener);
		runner.run(NewExample.class);
		assertTrue(wasRun);
	}
}