guava-tests/test/com/google/common/util/concurrent/ForwardingObjectTesterTest.java

/*
 * Copyright (C) 2012 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.util.concurrent;

import com.google.common.collect.ForwardingObject;

import junit.framework.TestCase;

/**
 * Tests for {@link ForwardingObjectTester}.
 *
 * @author Ben Yu
 */
public class ForwardingObjectTesterTest extends TestCase {

  public void testFailsToForward() {
    try {
      ForwardingObjectTester.testForwardingObject(FailToForward.class);
    } catch (AssertionError expected) {
      return;
    }
    fail("Should have thrown");
  }

  public void testSuccessfulForwarding() {
    ForwardingObjectTester.testForwardingObject(ForwardToDelegate.class);
  }

  private static abstract class FailToForward extends ForwardingObject implements Runnable {
    @Override public void run() {}
  }

  private static abstract class ForwardToDelegate extends ForwardingObject implements Runnable {
    @Override public void run() {
      delegate().run();
    }
    @Override protected abstract Runnable delegate();
  }
}