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Guava testlib is a set of java classes used for more convenient unit testing - particularly to assist the tests for Guava itself.
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/*
 * Copyright (C) 2007 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.testing;

import com.google.common.annotations.Beta;
import com.google.common.util.concurrent.CheckedFuture;
import com.google.common.util.concurrent.ListenableFuture;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

/**
 * Test case to make sure the {@link CheckedFuture#checkedGet()} and
 * {@link CheckedFuture#checkedGet(long, TimeUnit)} methods work correctly.
 *
 * @author Sven Mawson
 * @since 10.0
 */
@Beta
public abstract class AbstractCheckedFutureTest
    extends AbstractListenableFutureTest {

  /**
   * More specific type for the create method.
   */
  protected abstract  CheckedFuture createCheckedFuture(V value,
      Exception except, CountDownLatch waitOn);

  /**
   * Checks that the exception is the correct type of cancellation exception.
   */
  protected abstract void checkCancelledException(Exception e);

  /**
   * Checks that the exception is the correct type of execution exception.
   */
  protected abstract void checkExecutionException(Exception e);

  /**
   * Checks that the exception is the correct type of interruption exception.
   */
  protected abstract void checkInterruptedException(Exception e);

  @Override
  protected  ListenableFuture createListenableFuture(V value,
      Exception except, CountDownLatch waitOn) {
    return createCheckedFuture(value, except, waitOn);
  }

  /**
   * Tests that the {@link CheckedFuture#checkedGet()} method throws the correct
   * type of cancellation exception when it is cancelled.
   */
  public void testCheckedGetThrowsApplicationExceptionOnCancellation() {

    final CheckedFuture future =
        createCheckedFuture(Boolean.TRUE, null, latch);

    assertFalse(future.isDone());
    assertFalse(future.isCancelled());

    new Thread(new Runnable() {
      @Override
      public void run() {
        future.cancel(true);
      }
    }).start();

    try {
      future.checkedGet();
      fail("RPC Should have been cancelled.");
    } catch (Exception e) {
      checkCancelledException(e);
    }

    assertTrue(future.isDone());
    assertTrue(future.isCancelled());
  }

  public void testCheckedGetThrowsApplicationExceptionOnInterruption()
      throws InterruptedException {

    final CheckedFuture future =
        createCheckedFuture(Boolean.TRUE, null, latch);

    final CountDownLatch startingGate = new CountDownLatch(1);
    final CountDownLatch successLatch = new CountDownLatch(1);

    assertFalse(future.isDone());
    assertFalse(future.isCancelled());

    Thread getThread = new Thread(new Runnable() {
      @Override
      public void run() {
        startingGate.countDown();

        try {
          future.checkedGet();
        } catch (Exception e) {
          checkInterruptedException(e);

          // This only gets hit if the original call throws an exception and
          // the check call above passes.
          successLatch.countDown();
        }
      }
    });
    getThread.start();

    assertTrue(startingGate.await(500, TimeUnit.MILLISECONDS));
    getThread.interrupt();

    assertTrue(successLatch.await(500, TimeUnit.MILLISECONDS));

    assertFalse(future.isDone());
    assertFalse(future.isCancelled());
  }

  public void testCheckedGetThrowsApplicationExceptionOnError() {
    final CheckedFuture future =
        createCheckedFuture(Boolean.TRUE, new Exception("Error"), latch);

    assertFalse(future.isDone());
    assertFalse(future.isCancelled());

    new Thread(new Runnable() {
      @Override
      public void run() {
        latch.countDown();
      }
    }).start();

    try {
      future.checkedGet();
      fail();
    } catch (Exception e) {
      checkExecutionException(e);
    }

    assertTrue(future.isDone());
    assertFalse(future.isCancelled());
  }
}