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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;

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

/**
 * If you allocate external resources in a {@link org.junit.Before} method you need to release them
 * after the test runs. Annotating a public void method
 * with @After causes that method to be run after the {@link org.junit.Test} method. All @After
 * methods are guaranteed to run even if a {@link org.junit.Before} or {@link org.junit.Test} method throws an
 * exception. The @After methods declared in superclasses will be run after those of the current
 * class, unless they are overridden in the current class.
 * 
 * Here is a simple example:
 * 
 * public class Example {
 *    File output;
 *    @Before public void createOutputFile() {
 *          output= new File(...);
 *    }
 *    @Test public void something() {
 *          ...
 *    }
 *    @After public void deleteOutputFile() {
 *          output.delete();
 *    }
 * }
 * 
 *
 * @see org.junit.Before
 * @see org.junit.Test
 * @since 4.0
 */

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface After {
}