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

        }
    }


    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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    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()));
    }

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    /**
     * 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);

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      try {
        classes.add(Class.forName(each));
      } catch (ClassNotFoundException e) {
        System.out.println("Could not find class: " + each);
      }
    RunListener listener= new TextListener();
    addListener(listener);
    return run(classes.toArray(new Class[0]));
  }

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  /**
   * Do not use. Testing purposes only.
   */
  public Result run(Runner runner) {
    Result result= new Result();
    RunListener listener= result.createListener();
    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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    }


    private void beforeRun(RunNotifier notifier, final DebuggingInfo debuggingInfo) {
        debuggingInfo.collectData();


        RunListener listener = new RunListener() {
            @Override public void testFailure(Failure failure) throws Exception {
                debuggingInfo.printWarnings(logger);
            }
        };

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    private void beforeRun(RunNotifier notifier, final DebuggingInfo debuggingInfo) {
        debuggingInfo.collectData();


        //a listener that changes the failure's exception in a very hacky way...
        RunListener listener = new RunListener() {
            @Override public void testFailure(final Failure failure) throws Exception {
                Throwable throwable = (Throwable) Whitebox.getInternalState(failure, "fThrownException");
                
                String newMessage = throwable.getMessage();
                newMessage += "\n" + debuggingInfo.getWarnings(false) + "\n*** The actual failure is because of: ***\n";

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    dontStartListener = true;
    
    JUnitCore c = new org.junit.runner.JUnitCore();
    
    c.addListener( new RunListener()
    {
      @Override
      public void testRunStarted( Description description )
        throws Exception
      {

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    TestRuleIgnoreAfterMaxFailures prevRule = LuceneTestCase.replaceMaxFailureRule(newRule);
    System.clearProperty(SysGlobals.SYSPROP_ITERATIONS());
    try {
      JUnitCore core = new JUnitCore();
      final StringBuilder results = new StringBuilder();
      core.addListener(new RunListener() {
        char lastTest;


        @Override
        public void testStarted(Description description) throws Exception {
          lastTest = 'S'; // success.

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