public void testInvokeAny() throws Exception {
    Set<Callable<String>> tasks = Collections.singleton(() -> "invokeAny");

    String result = executorService.invokeAny(tasks, Duration.ofSeconds(7));

    assertThat(result).isEqualTo("invokeAny");
    assertThat(recordedTasks).isSameInstanceAs(tasks);
    assertThat(recordedTimeUnit).isEqualTo(NANOSECONDS);

   * submitted tasks and to collections of tasks submitted via {@code invokeAll}, {@code invokeAny},
   * {@code schedule}, {@code scheduleAtFixedRate}, and {@code scheduleWithFixedDelay}. In the case
   * of tasks submitted by {@code invokeAll} or {@code invokeAny}, tasks will run serially on the
   * calling thread. Tasks are run to completion before a {@code Future} is returned to the caller

   * submitted tasks and to collections of tasks submitted via {@code invokeAll}, {@code invokeAny},
   * {@code schedule}, {@code scheduleAtFixedRate}, and {@code scheduleWithFixedDelay}. In the case
   * of tasks submitted by {@code invokeAll} or {@code invokeAny}, tasks will run serially on the
   * calling thread. Tasks are run to completion before a {@code Future} is returned to the caller

    try {
      future.get();
      fail("Expected ExecutionException");
    } catch (ExecutionException e) {
      assertThat(e).hasCauseThat().isSameInstanceAs(expectedCause);
    }
  }

  /** invokeAny(null) throws NPE */
  public void testInvokeAnyImpl_nullTasks() throws Exception {
    ListeningExecutorService e = newDirectExecutorService();
    try {
      invokeAnyImpl(e, null, false, 0, TimeUnit.NANOSECONDS);

    try {
      future.get();
      fail("Expected ExecutionException");
    } catch (ExecutionException e) {
      assertThat(e).hasCauseThat().isSameInstanceAs(expectedCause);
    }
  }

  /** invokeAny(null) throws NPE */
  public void testInvokeAnyImpl_nullTasks() throws Exception {
    ListeningExecutorService e = newDirectExecutorService();
    try {
      invokeAnyImpl(e, null, false, 0, TimeUnit.NANOSECONDS);

   * as {@code execute} and {@code invokeAny}, are implemented in terms of calls to {@code
   * delegate.execute}. All other methods are forwarded unchanged to the delegate. This implies that
   * the returned {@code ListeningExecutorService} never calls the delegate's {@code submit}, {@code
   * invokeAll}, and {@code invokeAny} methods, so any special handling of tasks must be implemented