package org.junit.rules;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/**
* Verifier is a base class for Rules like ErrorCollector, which can turn
* otherwise passing test methods into failing tests if a verification check is
* failed
*
* <pre>
* public static class ErrorLogVerifier {
* private ErrorLog errorLog = new ErrorLog();
*
* @Rule
* public Verifier verifier = new Verifier() {
* @Override public void verify() {
* assertTrue(errorLog.isEmpty());
* }
* }
*
* @Test public void testThatMightWriteErrorLog() {
* // ...
* }
* }
* </pre>
*
* @since 4.7
*/
public abstract class Verifier implements TestRule {
public Statement apply(final Statement base, Description description) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
base.evaluate();
verify();
}
};
}
/**
* Override this to add verification logic. Overrides should throw an
* exception to indicate that verification failed.
*/
protected void verify() throws Throwable {
}
}