inputFuture.setException(error);
    // Verify that get throws an ExecutionException, caused by an Error, when
    // the callback is called.
    listener.assertException(error);
  }

  public void testAddListenerAfterCallback() throws Throwable {
    inputFuture.set(VALID_INPUT_DATA);

    listener.assertSuccess(getSuccessfulResult());
  }

  public void testFutureBeforeCallback() throws Throwable {