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TestWatcher.java
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TestWatcher.java
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package org.junit.rules;
import org.junit.internal.AssumptionViolatedException;
import org.junit.runner.Description;
import org.junit.runners.model.Statement;
/**
* TestWatcher is a base class for Rules that take note of the testing
* action, without modifying it. For example, this class will keep a log of each
* passing and failing test:
*
* <pre>
* public static class WatchmanTest {
* private static String watchedLog;
*
* @Rule
* public MethodRule watchman= new TestWatcher() {
* @Override
* protected void failed(Description d) {
* watchedLog+= d + "\n";
* }
*
* @Override
* protected void succeeded(Description d) {
* watchedLog+= d + " " + "success!\n";
* }
* };
*
* @Test
* public void fails() {
* fail();
* }
*
* @Test
* public void succeeds() {
* }
* }
* </pre>
*/
public abstract class TestWatcher implements TestRule {
public Statement apply(final Statement base, final Description description) {
return new Statement() {
@Override
public void evaluate() throws Throwable {
starting(description);
try {
base.evaluate();
succeeded(description);
} catch (AssumptionViolatedException e) {
throw e;
} catch (Throwable t) {
failed(t, description);
throw t;
} finally {
finished(description);
}
}
};
}
/**
* Invoked when a test succeeds
*
* @param description
*/
protected void succeeded(Description description) {
}
/**
* Invoked when a test fails
*
* @param e
* @param description
*/
protected void failed(Throwable e, Description description) {
}
/**
* Invoked when a test is about to start
*
* @param description
*/
protected void starting(Description description) {
}
/**
* Invoked when a test method finishes (whether passing or failing)
*
* @param description
*/
protected void finished(Description description) {
}
}