@Override
    public <T> T invokeAny(Collection<? extends Callable<T>> tasks) throws InterruptedException, ExecutionException {
        throw new UnsupportedOperationException();
    }
@Test(expected = UnsupportedOperationException.class)
    public void invokeAny() throws Exception {
        newManagedExecutorService().invokeAny(Collections.singleton(() -> null));
    }