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<pre><span class="sourceLineNo">001</span>package org.junit.rules;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import org.junit.runner.Description;<a name="line.3"></a>
<span class="sourceLineNo">004</span>import org.junit.runners.model.Statement;<a name="line.4"></a>
<span class="sourceLineNo">005</span><a name="line.5"></a>
<span class="sourceLineNo">006</span>/**<a name="line.6"></a>
<span class="sourceLineNo">007</span> * Verifier is a base class for Rules like ErrorCollector, which can turn<a name="line.7"></a>
<span class="sourceLineNo">008</span> * otherwise passing test methods into failing tests if a verification check is<a name="line.8"></a>
<span class="sourceLineNo">009</span> * failed<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * <pre><a name="line.11"></a>
<span class="sourceLineNo">012</span> * public static class ErrorLogVerifier {<a name="line.12"></a>
<span class="sourceLineNo">013</span> * private ErrorLog errorLog = new ErrorLog();<a name="line.13"></a>
<span class="sourceLineNo">014</span> *<a name="line.14"></a>
<span class="sourceLineNo">015</span> * &#064;Rule<a name="line.15"></a>
<span class="sourceLineNo">016</span> * public Verifier verifier = new Verifier() {<a name="line.16"></a>
<span class="sourceLineNo">017</span> * &#064;Override public void verify() {<a name="line.17"></a>
<span class="sourceLineNo">018</span> * assertTrue(errorLog.isEmpty());<a name="line.18"></a>
<span class="sourceLineNo">019</span> * }<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 testThatMightWriteErrorLog() {<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> * }<a name="line.25"></a>
<span class="sourceLineNo">026</span> * </pre><a name="line.26"></a>
<span class="sourceLineNo">027</span> *<a name="line.27"></a>
<span class="sourceLineNo">028</span> * @since 4.7<a name="line.28"></a>
<span class="sourceLineNo">029</span> */<a name="line.29"></a>
<span class="sourceLineNo">030</span>public abstract class Verifier implements TestRule {<a name="line.30"></a>
<span class="sourceLineNo">031</span> public Statement apply(final Statement base, Description description) {<a name="line.31"></a>
<span class="sourceLineNo">032</span> return new Statement() {<a name="line.32"></a>
<span class="sourceLineNo">033</span> @Override<a name="line.33"></a>
<span class="sourceLineNo">034</span> public void evaluate() throws Throwable {<a name="line.34"></a>
<span class="sourceLineNo">035</span> base.evaluate();<a name="line.35"></a>
<span class="sourceLineNo">036</span> verify();<a name="line.36"></a>
<span class="sourceLineNo">037</span> }<a name="line.37"></a>
<span class="sourceLineNo">038</span> };<a name="line.38"></a>
<span class="sourceLineNo">039</span> }<a name="line.39"></a>
<span class="sourceLineNo">040</span><a name="line.40"></a>
<span class="sourceLineNo">041</span> /**<a name="line.41"></a>
<span class="sourceLineNo">042</span> * Override this to add verification logic. Overrides should throw an<a name="line.42"></a>
<span class="sourceLineNo">043</span> * exception to indicate that verification failed.<a name="line.43"></a>
<span class="sourceLineNo">044</span> */<a name="line.44"></a>
<span class="sourceLineNo">045</span> protected void verify() throws Throwable {<a name="line.45"></a>
<span class="sourceLineNo">046</span> }<a name="line.46"></a>
<span class="sourceLineNo">047</span>}<a name="line.47"></a>
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