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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;

/**
 * If you allocate expensive external resources in a {@link org.junit.BeforeClass} method you need to release them
 * after all the tests in the class have run. Annotating a public static void method
 * with @AfterClass causes that method to be run after all the tests in the class have been run. All @AfterClass
 * methods are guaranteed to run even if a {@link org.junit.BeforeClass} method throws an
 * exception. The @AfterClass methods declared in superclasses will be run after those of the current
 * class, unless they are shadowed in the current class.
 *
 * Here is a simple example:
 *  * public class Example {
 *    private static DatabaseConnection database;
 *    @BeforeClass public static void login() {
 *          database= ...;
 *    }
 *    @Test public void something() {
 *          ...
 *    }
 *    @Test public void somethingElse() {
 *          ...
 *    }
 *    @AfterClass public static void logout() {
 *          database.logout();
 *    }
 * }
 * 
 *
 * @see org.junit.BeforeClass
 * @see org.junit.Test
 * @since 4.0
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface AfterClass {
}