### Question:
FutureUtils { public static <T> void complete(CompletableFuture<T> result, T value) { if (null == result) { return; } result.complete(value); } private  FutureUtils(); static CompletableFuture<Void> Void(); static T result(CompletableFuture<T> future); static T result(CompletableFuture<T> future, long timeout, TimeUnit timeUnit); @SneakyThrows(InterruptedException.class) static T result(
        CompletableFuture<T> future, Function<Throwable, ExceptionT> exceptionHandler); @SneakyThrows(InterruptedException.class) static T result(
        CompletableFuture<T> future,
        Function<Throwable, ExceptionT> exceptionHandler,
        long timeout,
        TimeUnit timeUnit); static CompletableFuture<T> createFuture(); static CompletableFuture<T> value(T value); static CompletableFuture<T> exception(Throwable cause); static void complete(CompletableFuture<T> result,
                                    T value); static void completeExceptionally(CompletableFuture<T> result,
                                                 Throwable cause); static CompletableFuture<T> whenCompleteAsync(
        CompletableFuture<T> future,
        BiConsumer<? super T, ? super Throwable> action,
        OrderedScheduler scheduler,
        Object scheduleKey); static CompletableFuture<List<T>> collect(List<CompletableFuture<T>> futureList); static void proxyTo(CompletableFuture<T> src,
                                   CompletableFuture<T> target); static CompletableFuture<List<R>> processList(List<T> collection,
                                                                Function<T, CompletableFuture<R>> processFunc,
                                                                @Nullable ExecutorService callbackExecutor); static CompletableFuture<T> within(final CompletableFuture<T> promise,
                                                  final long timeout,
                                                  final TimeUnit unit,
                                                  final Throwable cause,
                                                  final OrderedScheduler scheduler,
                                                  final Object key); static CompletableFuture<Void> ignore(CompletableFuture<T> future); static CompletableFuture<Void> ignore(CompletableFuture<T> future,
                                                     final String errorMsg); static CompletableFuture<T> ensure(CompletableFuture<T> future,
                                                  Runnable ensureBlock); static CompletableFuture<T> rescue(CompletableFuture<T> future,
                                                  Function<Throwable, CompletableFuture<T>> rescueFuc); static CompletableFuture<T> stats(CompletableFuture<T> result,
                                                 OpStatsLogger opStatsLogger,
                                                 Stopwatch stopwatch);  }### Answer:
@Test public void testComplete() throws Exception { CompletableFuture<Long> future = FutureUtils.createFuture(); FutureUtils.complete(future, 1024L); assertEquals(1024L, FutureUtils.result(future).longValue()); }