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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.rules;

import java.util.ArrayList;
import java.util.List;

import org.junit.AssumptionViolatedException;
import org.junit.runner.Description;
import org.junit.runners.model.MultipleFailureException;
import org.junit.runners.model.Statement;

/**
 * TestWatcher is a base class for Rules that take note of the testing
 * action, without modifying it. For example, this class will keep a log of each
 * passing and failing test:
 *
 *  * public static class WatchmanTest {
 *  private static String watchedLog;
 *
 *  @Rule
 *  public TestWatcher watchman= new TestWatcher() {
 *      @Override
 *      protected void failed(Throwable e, Description description) {
 *          watchedLog+= description + "\n";
 *      }
 *
 *      @Override
 *      protected void succeeded(Description description) {
 *          watchedLog+= description + " " + "success!\n";
 *         }
 *     };
 *
 *  @Test
 *  public void fails() {
 *      fail();
 *  }
 *
 *  @Test
 *  public void succeeds() {
 *     }
 * }
 * 
 *
 * @since 4.9
 */
public abstract class TestWatcher implements TestRule {
    public Statement apply(final Statement base, final Description description) {
        return new Statement() {
            @Override
            public void evaluate() throws Throwable {
                List errors = new ArrayList();

                startingQuietly(description, errors);
                try {
                    base.evaluate();
                    succeededQuietly(description, errors);
                } catch (@SuppressWarnings("deprecation") org.junit.internal.AssumptionViolatedException  e) {
                    errors.add(e);
                    skippedQuietly(e, description, errors);
                } catch (Throwable e) {
                    errors.add(e);
                    failedQuietly(e, description, errors);
                } finally {
                    finishedQuietly(description, errors);
                }

                MultipleFailureException.assertEmpty(errors);
            }
        };
    }

    private void succeededQuietly(Description description,
            List errors) {
        try {
            succeeded(description);
        } catch (Throwable e) {
            errors.add(e);
        }
    }

    private void failedQuietly(Throwable e, Description description,
            List errors) {
        try {
            failed(e, description);
        } catch (Throwable e1) {
            errors.add(e1);
        }
    }

    @SuppressWarnings("deprecation")
    private void skippedQuietly(
            org.junit.internal.AssumptionViolatedException e, Description description,
            List errors) {
        try {
            if (e instanceof AssumptionViolatedException) {
                skipped((AssumptionViolatedException) e, description);
            } else {
                skipped(e, description);
            }
        } catch (Throwable e1) {
            errors.add(e1);
        }
    }

    private void startingQuietly(Description description,
            List errors) {
        try {
            starting(description);
        } catch (Throwable e) {
            errors.add(e);
        }
    }

    private void finishedQuietly(Description description,
            List errors) {
        try {
            finished(description);
        } catch (Throwable e) {
            errors.add(e);
        }
    }

    /**
     * Invoked when a test succeeds
     */
    protected void succeeded(Description description) {
    }

    /**
     * Invoked when a test fails
     */
    protected void failed(Throwable e, Description description) {
    }

    /**
     * Invoked when a test is skipped due to a failed assumption.
     */
    @SuppressWarnings("deprecation")
    protected void skipped(AssumptionViolatedException e, Description description) {
        // For backwards compatibility with JUnit 4.11 and earlier, call the legacy version
        org.junit.internal.AssumptionViolatedException asInternalException = e;
        skipped(asInternalException, description);
    }

    /**
     * Invoked when a test is skipped due to a failed assumption.
     *
     * @deprecated use {@link #skipped(AssumptionViolatedException, Description)}
     */
    @Deprecated
    protected void skipped(
            org.junit.internal.AssumptionViolatedException e, Description description) {
    }

    /**
     * Invoked when a test is about to start
     */
    protected void starting(Description description) {
    }

    /**
     * Invoked when a test method finishes (whether passing or failing)
     */
    protected void finished(Description description) {
    }
}