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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;

/**
 * Sometimes several tests need to share computationally expensive setup
 * (like logging into a database). While this can compromise the independence of 
 * tests, sometimes it is a necessary optimization. Annotating a public static void no-arg method
 * with @BeforeClass causes it to be run once before any of 
 * the test methods in the class. The @BeforeClass methods of superclasses
 * will be run before those the current class.
 * 
 * For example:
 *  * public class Example {
 *    @BeforeClass public static void onlyOnce() {
 *       ...
 *    }
 *    @Test public void one() {
 *       ...
 *    }
 *    @Test public void two() {
 *       ...
 *    }
 * }
 * 
 * @see org.junit.AfterClass
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface BeforeClass {
}