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

    @Test
    public void listenersAreCalledCorrectlyInTheFaceOfFailures()
            throws Exception {
        JUnitCore core = new JUnitCore();
        final List<Failure> failures = new ArrayList<Failure>();
        core.addListener(new RunListener() {
            @Override
            public void testRunFinished(Result result) throws Exception {
                failures.addAll(result.getFailures());
            }
        });

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public class OldTestClassAdaptingListenerTest {
    @Test
    public void addFailureDelegatesToNotifier() {
        Result result = new Result();
        RunListener listener = result.createListener();
        RunNotifier notifier = new RunNotifier();
        notifier.addFirstListener(listener);
        TestCase testCase = new TestCase() {
        };
        TestListener adaptingListener = new JUnit38ClassRunner(testCase)

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    }


    @Test
    public void testListener() throws Exception {
        JUnitCore runner = new JUnitCore();
        RunListener listener = new RunListener() {
            @Override
            public void testStarted(Description description) {
                assertEquals(Description.createTestDescription(OneTest.class, "testOne"),
                        description);
                count++;

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    @Test
    public void failedAssumptionsCanBeDetectedByListeners() {
        assumptionFailures = 0;
        JUnitCore core = new JUnitCore();
        core.addListener(new RunListener() {
            @Override
            public void testAssumptionFailure(Failure failure) {
                assumptionFailures++;
            }
        });

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     * {@link Failure} objects that were {@link AssumptionViolatedException}s.
     */
    private static List<Failure> runAndGetAssumptionFailures(Class<?> clazz) {
        final List<Failure> failures = new ArrayList<Failure>();
        final JUnitCore core = new JUnitCore();
        core.addListener(new RunListener() {
            @Override
            public void testAssumptionFailure(Failure failure) {
                failures.add(failure);
            }
        });

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    @Test
    public void testFinished() {
        JUnitCore runner = new JUnitCore();
        wasRun = false;
        RunListener listener = new MyListener() {
            @Override
            public void testFinished(Description description) {
                wasRun = true;
            }
        };

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    @Test
    public void notifyListenersInTheOrderInWhichTheyAreAdded() {
        JUnitCore core = new JUnitCore();
        log = "";
        core.addListener(new RunListener() {
            @Override
            public void testRunStarted(Description description) throws Exception {
                log += "first ";
            }
        });
        core.addListener(new RunListener() {
            @Override
            public void testRunStarted(Description description) throws Exception {
                log += "second ";
            }
        });

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    }
  }
  @Test public void notifyListenersInTheOrderInWhichTheyAreAdded() {
    JUnitCore core= new JUnitCore();
    log= "";
    core.addListener(new RunListener() {
      @Override
      public void testRunStarted(Description description) throws Exception {
        log+="first ";
      }
    });
    core.addListener(new RunListener() {
      @Override
      public void testRunStarted(Description description) throws Exception {
        log+="second ";
      }
    });

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    }
  }
  
  @Test public void testListener() throws Exception {
    JUnitCore runner= new JUnitCore();
    RunListener listener= new RunListener() {
      @Override
      public void testStarted(Description description) {
        assertEquals(Description.createTestDescription(OneTest.class, "testOne"), 
            description);
        count++;

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  }
  
  @Test public void testFinished() {
    JUnitCore runner= new JUnitCore();
    wasRun= false;
    RunListener listener= new MyListener() {
      @Override
      public void testFinished(Description description) {
        wasRun= true;
      }
    };

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