1 package org.junit; 2 3 import java.lang.annotation.ElementType; 4 import java.lang.annotation.Retention; 5 import java.lang.annotation.RetentionPolicy; 6 import java.lang.annotation.Target; 7 8 /** 9 * <p>Sometimes several tests need to share computationally expensive setup 10 * (like logging into a database). While this can compromise the independence of 11 * tests, sometimes it is a necessary optimization. Annotating a <code>public static void</code> no-arg method 12 * with <code>@BeforeClass</code> causes it to be run once before any of 13 * the test methods in the class. The <code>@BeforeClass</code> methods of superclasses 14 * will be run before those the current class.</p> 15 * 16 * For example: 17 * <pre> 18 * public class Example { 19 * @BeforeClass public static void onlyOnce() { 20 * ... 21 * } 22 * @Test public void one() { 23 * ... 24 * } 25 * @Test public void two() { 26 * ... 27 * } 28 * } 29 * </pre> 30 * @see org.junit.AfterClass 31 */ 32 @Retention(RetentionPolicy.RUNTIME) 33 @Target(ElementType.METHOD) 34 public @interface BeforeClass { 35 } 36