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/*
* Copyright (C) 2010 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.testing;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;
import com.google.common.annotations.GwtCompatible;
import junit.framework.TestCase;
import org.junit.Test;
/**
* @author Luiz-Otavio "Z" Zorzella
*/
@GwtCompatible
public class TearDownStackTest extends TestCase {
private TearDownStack tearDownStack = new TearDownStack();
@Test
public void testSingleTearDown() throws Exception {
final TearDownStack stack = buildTearDownStack();
final SimpleTearDown tearDown = new SimpleTearDown();
stack.addTearDown(tearDown);
assertEquals(false, tearDown.ran);
stack.runTearDown();
assertEquals("tearDown should have run", true, tearDown.ran);
}
@Test
public void testMultipleTearDownsHappenInOrder() throws Exception {
final TearDownStack stack = buildTearDownStack();
final SimpleTearDown tearDownOne = new SimpleTearDown();
stack.addTearDown(tearDownOne);
final Callback callback = new Callback() {
@Override
public void run() {
assertEquals("tearDownTwo should have been run before tearDownOne",
false, tearDownOne.ran);
}
};
final SimpleTearDown tearDownTwo = new SimpleTearDown(callback);
stack.addTearDown(tearDownTwo);
assertEquals(false, tearDownOne.ran);
assertEquals(false, tearDownTwo.ran);
stack.runTearDown();
assertEquals("tearDownOne should have run", true, tearDownOne.ran);
assertEquals("tearDownTwo should have run", true, tearDownTwo.ran);
}
@Test
public void testThrowingTearDown() throws Exception {
final TearDownStack stack = buildTearDownStack();
final ThrowingTearDown tearDownOne = new ThrowingTearDown("one");
stack.addTearDown(tearDownOne);
final ThrowingTearDown tearDownTwo = new ThrowingTearDown("two");
stack.addTearDown(tearDownTwo);
assertEquals(false, tearDownOne.ran);
assertEquals(false, tearDownTwo.ran);
try {
stack.runTearDown();
fail("runTearDown should have thrown an exception");
} catch (ClusterException expected) {
assertEquals("two", expected.getCause().getMessage());
} catch (RuntimeException e) {
throw new RuntimeException(
"A ClusterException should have been thrown, rather than a " + e.getClass().getName(), e);
}
assertEquals(true, tearDownOne.ran);
assertEquals(true, tearDownTwo.ran);
}
@Override public final void runBare() throws Throwable {
try {
setUp();
runTest();
} finally {
tearDown();
}
}
@Override protected void tearDown() {
tearDownStack.runTearDown();
}
/**
* Builds a {@link TearDownStack} that makes sure it's clear by the end of
* this test.
*/
private TearDownStack buildTearDownStack() {
final TearDownStack result = new TearDownStack();
tearDownStack.addTearDown(new TearDown() {
@Override
public void tearDown() throws Exception {
assertEquals(
"The test should have cleared the stack (say, by virtue of running runTearDown)",
0, result.stack.size());
}
});
return result;
}
private static final class ThrowingTearDown implements TearDown {
private final String id;
boolean ran = false;
ThrowingTearDown(String id) {
this.id = id;
}
@Override
public void tearDown() throws Exception {
ran = true;
throw new RuntimeException(id);
}
}
private static final class SimpleTearDown implements TearDown {
boolean ran = false;
Callback callback = null;
public SimpleTearDown() {}
public SimpleTearDown(Callback callback) {
this.callback = callback;
}
@Override
public void tearDown() throws Exception {
if (callback != null) {
callback.run();
}
ran = true;
}
}
private interface Callback {
void run();
}
}
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