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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.internal.runners;

import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;

import org.junit.runner.Description;
import org.junit.runner.Runner;
import org.junit.runner.manipulation.Filter;
import org.junit.runner.manipulation.Filterable;
import org.junit.runner.manipulation.NoTestsRemainException;
import org.junit.runner.manipulation.Sortable;
import org.junit.runner.manipulation.Sorter;
import org.junit.runner.notification.Failure;
import org.junit.runner.notification.RunNotifier;
import org.junit.runners.BlockJUnit4ClassRunner;

/**
 * @deprecated Included for backwards compatibility with JUnit 4.4. Will be
 *             removed in the next release. Please use
 *             {@link BlockJUnit4ClassRunner} in place of {@link JUnit4ClassRunner}.
 *             
 *             This may disappear as soon as 1 April 2009
 */
@Deprecated
public class JUnit4ClassRunner extends Runner implements Filterable, Sortable {
	private final List fTestMethods;
	private TestClass fTestClass;

	public JUnit4ClassRunner(Class klass) throws InitializationError {
		fTestClass= new TestClass(klass);
		fTestMethods= getTestMethods();
		validate();
	}
	
	protected List getTestMethods() {
		return fTestClass.getTestMethods();
	}
	
	protected void validate() throws InitializationError {
		MethodValidator methodValidator= new MethodValidator(fTestClass);
		methodValidator.validateMethodsForDefaultRunner();
		methodValidator.assertValid();
	}

	@Override
	public void run(final RunNotifier notifier) {
		new ClassRoadie(notifier, fTestClass, getDescription(), new Runnable() {
			public void run() {
				runMethods(notifier);
			}
		}).runProtected();
	}

	protected void runMethods(final RunNotifier notifier) {
		for (Method method : fTestMethods)
			invokeTestMethod(method, notifier);
	}

	@Override
	public Description getDescription() {
		Description spec= Description.createSuiteDescription(getName(), classAnnotations());
		List testMethods= fTestMethods;
		for (Method method : testMethods)
			spec.addChild(methodDescription(method));
		return spec;
	}

	protected Annotation[] classAnnotations() {
		return fTestClass.getJavaClass().getAnnotations();
	}

	protected String getName() {
		return getTestClass().getName();
	}
	
	protected Object createTest() throws Exception {
		return getTestClass().getConstructor().newInstance();
	}

	protected void invokeTestMethod(Method method, RunNotifier notifier) {
		Description description= methodDescription(method);
		Object test;
		try {
			test= createTest();
		} catch (InvocationTargetException e) {
			testAborted(notifier, description, e.getCause());
			return;			
		} catch (Exception e) {
			testAborted(notifier, description, e);
			return;
		}
		TestMethod testMethod= wrapMethod(method);
		new MethodRoadie(test, testMethod, notifier, description).run();
	}

	private void testAborted(RunNotifier notifier, Description description,
			Throwable e) {
		notifier.fireTestStarted(description);
		notifier.fireTestFailure(new Failure(description, e));
		notifier.fireTestFinished(description);
	}

	protected TestMethod wrapMethod(Method method) {
		return new TestMethod(method, fTestClass);
	}

	protected String testName(Method method) {
		return method.getName();
	}

	protected Description methodDescription(Method method) {
		return Description.createTestDescription(getTestClass().getJavaClass(), testName(method), testAnnotations(method));
	}

	protected Annotation[] testAnnotations(Method method) {
		return method.getAnnotations();
	}

	public void filter(Filter filter) throws NoTestsRemainException {
		for (Iterator iter= fTestMethods.iterator(); iter.hasNext();) {
			Method method= iter.next();
			if (!filter.shouldRun(methodDescription(method)))
				iter.remove();
		}
		if (fTestMethods.isEmpty())
			throw new NoTestsRemainException();
	}

	public void sort(final Sorter sorter) {
		Collections.sort(fTestMethods, new Comparator() {
			public int compare(Method o1, Method o2) {
				return sorter.compare(methodDescription(o1), methodDescription(o2));
			}
		});
	}

	protected TestClass getTestClass() {
		return fTestClass;
	}
}