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JUnit is a unit testing framework for Java, created by Erich Gamma and Kent Beck.
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package org.junit.runner;

import junit.runner.Version;
import org.junit.internal.JUnitSystem;
import org.junit.internal.RealSystem;
import org.junit.internal.TextListener;
import org.junit.internal.runners.JUnit38ClassRunner;
import org.junit.runner.notification.RunListener;
import org.junit.runner.notification.RunNotifier;

/**
 * JUnitCore is a facade for running tests. It supports running JUnit 4 tests,
 * JUnit 3.8.x tests, and mixtures. To run tests from the command line, run
 * java org.junit.runner.JUnitCore TestClass1 TestClass2 ....
 * For one-shot test runs, use the static method {@link #runClasses(Class[])}.
 * If you want to add special listeners,
 * create an instance of {@link org.junit.runner.JUnitCore} first and use it to run the tests.
 *
 * @see org.junit.runner.Result
 * @see org.junit.runner.notification.RunListener
 * @see org.junit.runner.Request
 * @since 4.0
 */
public class JUnitCore {
    private final RunNotifier notifier = new RunNotifier();

    /**
     * Run the tests contained in the classes named in the args.
     * If all tests run successfully, exit with a status of 0. Otherwise exit with a status of 1.
     * Write feedback while tests are running and write
     * stack traces for all failed tests after the tests all complete.
     *
     * @param args names of classes in which to find tests to run
     */
    public static void main(String... args) {
        Result result = new JUnitCore().runMain(new RealSystem(), args);
        System.exit(result.wasSuccessful() ? 0 : 1);
    }

    /**
     * Run the tests contained in classes. Write feedback while the tests
     * are running and write stack traces for all failed tests after all tests complete. This is
     * similar to {@link #main(String[])}, but intended to be used programmatically.
     *
     * @param classes Classes in which to find tests
     * @return a {@link Result} describing the details of the test run and the failed tests.
     */
    public static Result runClasses(Class... classes) {
        return runClasses(defaultComputer(), classes);
    }

    /**
     * Run the tests contained in classes. Write feedback while the tests
     * are running and write stack traces for all failed tests after all tests complete. This is
     * similar to {@link #main(String[])}, but intended to be used programmatically.
     *
     * @param computer Helps construct Runners from classes
     * @param classes  Classes in which to find tests
     * @return a {@link Result} describing the details of the test run and the failed tests.
     */
    public static Result runClasses(Computer computer, Class... classes) {
        return new JUnitCore().run(computer, classes);
    }

    /**
     * @param system
     * @param args from main()
     */
    Result runMain(JUnitSystem system, String... args) {
        system.out().println("JUnit version " + Version.id());

        JUnitCommandLineParseResult jUnitCommandLineParseResult = JUnitCommandLineParseResult.parse(args);

        RunListener listener = new TextListener(system);
        addListener(listener);

        return run(jUnitCommandLineParseResult.createRequest(defaultComputer()));
    }

    /**
     * @return the version number of this release
     */
    public String getVersion() {
        return Version.id();
    }

    /**
     * Run all the tests in classes.
     *
     * @param classes the classes containing tests
     * @return a {@link Result} describing the details of the test run and the failed tests.
     */
    public Result run(Class... classes) {
        return run(defaultComputer(), classes);
    }

    /**
     * Run all the tests in classes.
     *
     * @param computer Helps construct Runners from classes
     * @param classes the classes containing tests
     * @return a {@link Result} describing the details of the test run and the failed tests.
     */
    public Result run(Computer computer, Class... classes) {
        return run(Request.classes(computer, classes));
    }

    /**
     * Run all the tests contained in request.
     *
     * @param request the request describing tests
     * @return a {@link Result} describing the details of the test run and the failed tests.
     */
    public Result run(Request request) {
        return run(request.getRunner());
    }

    /**
     * Run all the tests contained in JUnit 3.8.x test. Here for backward compatibility.
     *
     * @param test the old-style test
     * @return a {@link Result} describing the details of the test run and the failed tests.
     */
    public Result run(junit.framework.Test test) {
        return run(new JUnit38ClassRunner(test));
    }

    /**
     * Do not use. Testing purposes only.
     */
    public Result run(Runner runner) {
        Result result = new Result();
        RunListener listener = result.createListener();
        notifier.addFirstListener(listener);
        try {
            notifier.fireTestRunStarted(runner.getDescription());
            runner.run(notifier);
            notifier.fireTestRunFinished(result);
        } finally {
            removeListener(listener);
        }
        return result;
    }

    /**
     * Add a listener to be notified as the tests run.
     *
     * @param listener the listener to add
     * @see org.junit.runner.notification.RunListener
     */
    public void addListener(RunListener listener) {
        notifier.addListener(listener);
    }

    /**
     * Remove a listener.
     *
     * @param listener the listener to remove
     */
    public void removeListener(RunListener listener) {
        notifier.removeListener(listener);
    }

    static Computer defaultComputer() {
        return new Computer();
    }
}