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<pre><span class="sourceLineNo">001</span>package org.junit;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import java.lang.annotation.ElementType;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import java.lang.annotation.Retention;<a name="line.4"></a>
<span class="sourceLineNo">005</span>import java.lang.annotation.RetentionPolicy;<a name="line.5"></a>
<span class="sourceLineNo">006</span>import java.lang.annotation.Target;<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>/**<a name="line.8"></a>
<span class="sourceLineNo">009</span> * Sometimes several tests need to share computationally expensive setup<a name="line.9"></a>
<span class="sourceLineNo">010</span> * (like logging into a database). While this can compromise the independence of<a name="line.10"></a>
<span class="sourceLineNo">011</span> * tests, sometimes it is a necessary optimization. Annotating a <code>public static void</code> no-arg method<a name="line.11"></a>
<span class="sourceLineNo">012</span> * with <code>@BeforeClass</code> causes it to be run once before any of<a name="line.12"></a>
<span class="sourceLineNo">013</span> * the test methods in the class. The <code>@BeforeClass</code> methods of superclasses<a name="line.13"></a>
<span class="sourceLineNo">014</span> * will be run before those of the current class, unless they are shadowed in the current class.<a name="line.14"></a>
<span class="sourceLineNo">015</span> * <p><a name="line.15"></a>
<span class="sourceLineNo">016</span> * For example:<a name="line.16"></a>
<span class="sourceLineNo">017</span> * <pre><a name="line.17"></a>
<span class="sourceLineNo">018</span> * public class Example {<a name="line.18"></a>
<span class="sourceLineNo">019</span> * &#064;BeforeClass public static void onlyOnce() {<a name="line.19"></a>
<span class="sourceLineNo">020</span> * ...<a name="line.20"></a>
<span class="sourceLineNo">021</span> * }<a name="line.21"></a>
<span class="sourceLineNo">022</span> * &#064;Test public void one() {<a name="line.22"></a>
<span class="sourceLineNo">023</span> * ...<a name="line.23"></a>
<span class="sourceLineNo">024</span> * }<a name="line.24"></a>
<span class="sourceLineNo">025</span> * &#064;Test public void two() {<a name="line.25"></a>
<span class="sourceLineNo">026</span> * ...<a name="line.26"></a>
<span class="sourceLineNo">027</span> * }<a name="line.27"></a>
<span class="sourceLineNo">028</span> * }<a name="line.28"></a>
<span class="sourceLineNo">029</span> * </pre><a name="line.29"></a>
<span class="sourceLineNo">030</span> *<a name="line.30"></a>
<span class="sourceLineNo">031</span> * @see org.junit.AfterClass<a name="line.31"></a>
<span class="sourceLineNo">032</span> * @since 4.0<a name="line.32"></a>
<span class="sourceLineNo">033</span> */<a name="line.33"></a>
<span class="sourceLineNo">034</span>@Retention(RetentionPolicy.RUNTIME)<a name="line.34"></a>
<span class="sourceLineNo">035</span>@Target(ElementType.METHOD)<a name="line.35"></a>
<span class="sourceLineNo">036</span>public @interface BeforeClass {<a name="line.36"></a>
<span class="sourceLineNo">037</span>}<a name="line.37"></a>
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