@Override
    public <T> List<Future<T>> invokeAll(Collection<? extends Callable<T>> tasks) throws InterruptedException {
        throw new UnsupportedOperationException();
    }
@Test(expected = UnsupportedOperationException.class)
    public void invokeAll_withTimeout() throws Exception {
        newManagedExecutorService().invokeAll(Collections.singleton(() -> null), 1, TimeUnit.SECONDS);
    }