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JUnit is a regression testing framework written by Erich Gamma and Kent Beck. It is used by the developer who implements unit tests in Java.

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package org.junit;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

/**
 * The Test annotation tells JUnit that the public void method
 * to which it is attached can be run as a test case. To run the method,
 * JUnit first constructs a fresh instance of the class then invokes the
 * annotated method. Any exceptions thrown by the test will be reported
 * by JUnit as a failure. If no exceptions are thrown, the test is assumed
 * to have succeeded.
 *
 * A simple test looks like this:
 * 
 * public class Example {
 *    @Test
 *    public void method() {
 *       org.junit.Assert.assertTrue( new ArrayList().isEmpty() );
 *    }
 * }
 * 
 * 
 *
 * The Test annotation supports two optional parameters.
 * The first, expected, declares that a test method should throw
 * an exception. If it doesn't throw an exception or if it throws a different exception
 * than the one declared, the test fails. For example, the following test succeeds:
 * 
 *    @Test(expected=IndexOutOfBoundsException.class) public void outOfBounds() {
 *       new ArrayList<Object>().get(1);
 *    }
 * 

 *
 * The second optional parameter, timeout, causes a test to fail if it takes
 * longer than a specified amount of clock time (measured in milliseconds). The following test fails:
 * 
 *    @Test(timeout=100) public void infinity() {
 *       while(true);
 *    }
 * 

 *
 * @since 4.0
 */
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD})
public @interface Test {

    /**
     * Default empty exception
     */
    static class None extends Throwable {
        private static final long serialVersionUID = 1L;

        private None() {
        }
    }

    /**
     * Optionally specify expected, a Throwable, to cause a test method to succeed iff
     * an exception of the specified class is thrown by the method.
     */
    Class expected() default None.class;

    /**
     * Optionally specify timeout in milliseconds to cause a test method to fail if it
     * takes longer than that number of milliseconds.
     */
    long timeout() default 0L;
}