Examples of org.junit.runner.notification.RunListener

org.junit.runner.notification.RunListener
Register an instance of this class with {@link RunNotifier} to be notifiedof events that occur during a test run. All of the methods in this class are abstract and have no implementation; override one or more methods to receive events.
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); } 
```
If a listener throws an exception for a test event, the other listeners will have their {@link RunListener#testFailure(Failure)} called with a {@code Description}of {@link Description#TEST_MECHANISM} to indicate the failure.
By default, JUnit will synchronize calls to your listener. If your listener is thread-safe and you want to allow JUnit to call your listener from multiple threads when tests are run in parallel, you can annotate your test class with {@link RunListener.ThreadSafe}.
Listener methods will be called from the same thread as is running the test, unless otherwise indicated by the method Javadoc @see org.junit.runner.JUnitCore @since 4.0

        system.out().println("Could not find class: " + each);
        Description description= Description.createSuiteDescription(each);
        Failure failure= new Failure(description, e);
        missingClasses.add(failure);
      }
    RunListener listener= new TextListener(system);
    addListener(listener);
    Result result= run(classes.toArray(new Class[0]));
    for (Failure each : missingClasses)
      result.getFailures().add(each);
    return result;

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

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  }


  public RunNotifier getNotifier(final TestResult result,
      final JUnit4TestAdapter adapter) {
    RunNotifier notifier = new RunNotifier();
    notifier.addListener(new RunListener() {
      @Override
      public void testFailure(Failure failure) throws Exception {
        result.addError(asTest(failure.getDescription()), failure.getException());
      }

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    this.failures= failures;
  }


  public Result result() {
    Result result= new Result();
    RunListener listener= result.createListener();
    for (Failure failure : failures) {
      try {
        listener.testFailure(failure);
      } catch (Exception e) {
        throw new RuntimeException("I can't believe this happened");
      }
    }
    return result;

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    public RunNotifier getNotifier(final TestResult result) {


        final IgnoredTestResult resultWrapper = (IgnoredTestResult) result;


        RunNotifier notifier = new RunNotifier();
        notifier.addListener(new RunListener() {
            @Override
            public void testFailure(Failure failure) throws Exception {
                result.addError(asTest(failure.getDescription()), failure.getException());
            }

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    extends TestCase
{
    public void testTestRunStarted()
        throws Exception
    {
        RunListener jUnit4TestSetReporter =
            new JUnitCoreRunListener( new MockReporter(), new HashMap<String, TestSet>() );
        JUnitCore core = new JUnitCore();
        core.addListener( jUnit4TestSetReporter );
        Result result = core.run( new Computer(), STest1.class, STest2.class );
        core.removeListener( jUnit4TestSetReporter );

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    }


    public void testFailedAssumption()
        throws Exception
    {
        RunListener jUnit4TestSetReporter =
            new JUnitCoreRunListener( new MockReporter(), new HashMap<String, TestSet>() );
        JUnitCore core = new JUnitCore();
        core.addListener( jUnit4TestSetReporter );
        Result result = core.run( new Computer(), TestWithAssumptionFailure.class );
        core.removeListener( jUnit4TestSetReporter );

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    @Override
    public void run(RunNotifier notifier) {        


        //a listener that changes the failure's exception in a very hacky way...
        RunListener listener = new RunListener() {
            
            WarningsCollector warningsCollector;
                       
            @Override
            public void testStarted(Description description) throws Exception {

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    // only print iteration info if the user requested more than one iterations
    final boolean verbose = VERBOSE && TEST_ITER > 1;
    
    final int currentIter[] = new int[1];
    arg1.addListener(new RunListener() {
      @Override
      public void testFailure(Failure failure) throws Exception {
        if (verbose) {
          System.out.println("\nNOTE: iteration " + currentIter[0] + " failed! ");
        }

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   * Test execution logic for the entire suite, executing under designated
   * {@link RunnerThreadGroup}.
   */
  private void runSuite(final RandomizedContext context, final RunNotifier notifier) {
    final Result result = new Result();
    final RunListener accounting = result.createListener();
    notifier.addListener(accounting);


    final Randomness classRandomness = runnerRandomness.clone(Thread.currentThread());
    context.push(classRandomness);
    try {

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