String s = testExecutor.invokeAny(tasks);
      assertEquals("ran0", s);
      mock.assertLastMethodCalled("invokeAny");
    }
    {
      MockExecutor mock = new MockExecutor();
      TimeUnit unit = SECONDS;
      long timeout = 5;
      TestExecutor testExecutor = new TestExecutor(mock);
      String s = testExecutor.invokeAny(tasks, timeout, unit);
      assertEquals(RESULT_VALUE + "0", s);

    return delegate.invokeAll(tasks, timeout, unit);
  }

  @Override
  public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
      throws InterruptedException, ExecutionException {
    Preconditions.checkNotNull(tasks, "tasks must not be null!");
    return delegate.invokeAny(tasks);
  }

  @Override
  public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)

    return delegate.invokeAll(tasks, timeout, unit);
  }

  @Override
  public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
      throws InterruptedException, ExecutionException {
    Preconditions.checkNotNull(tasks, "tasks must not be null!");
    return delegate.invokeAny(tasks);
  }

  @Override
  public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)

  }

  @Override
  public final <T extends @Nullable Object> T invokeAny(Collection<? extends Callable<T>> tasks)
      throws InterruptedException, ExecutionException {
    return delegate.invokeAny(wrapTasks(tasks));
  }

  @Override
  public final <T extends @Nullable Object> T invokeAny(
      Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)

    return delegate().invokeAll(tasks, timeout, unit);
  }

  @Override
  public <T extends @Nullable Object> T invokeAny(Collection<? extends Callable<T>> tasks)
      throws InterruptedException, ExecutionException {
    return delegate().invokeAny(tasks);
  }

  @Override
  public <T extends @Nullable Object> T invokeAny(
      Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)

   * 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

  }

  /**
   * Duration-based overload of {@link #invokeAny(Collection, long, TimeUnit)}.
   *
   * @since 32.1.0
   */
  @J2ktIncompatible
  default <T extends @Nullable Object> T invokeAny(
      Collection<? extends Callable<T>> tasks, Duration timeout)
      throws InterruptedException, ExecutionException, TimeoutException {
    return invokeAny(tasks, toNanosSaturated(timeout), TimeUnit.NANOSECONDS);
  }

    }
  }

  /** invokeAny(null) throws NPE */
  public void testInvokeAnyImpl_nullTasks() throws Exception {
    ListeningExecutorService e = newDirectExecutorService();
    try {
      invokeAnyImpl(e, null, false, 0, NANOSECONDS);
      fail();
    } catch (NullPointerException success) {
    } finally {
      joinPool(e);
    }
  }

  /** invokeAny(empty collection) throws IAE */

      throw new UnsupportedOperationException();
    }

    @Override
    public <T> T invokeAny(Collection<? extends Callable<T>> tasks)
        throws ExecutionException, InterruptedException {
      throw new UnsupportedOperationException();
    }

    @Override
    public <T> T invokeAny(Collection<? extends Callable<T>> tasks, long timeout, TimeUnit unit)