Object unused =
        new Object() {
          @SuppressWarnings({"removal", "Finalize"}) // b/487687332
          @Override
          protected void finalize() {
            latch.countDown();
          }
        };
    unused = null; // Hint to the JIT that unused is unreachable
    GcFinalization.await(latch);
    assertEquals(0, latch.getCount());
  }

  public void testAwaitDone_future() {

            // Verify that our custom thread was captured
            assertTrue("Should find custom thread in dump", customThreadFound.get() > 0);

        } finally {
            latch.countDown();
            customThread.join(1000); // Wait up to 1 second for thread to finish
        }
    }

    @Test
    public void test_writeThreadDump_fileContent() throws IOException {

                } catch (final InterruptedException e) {
                    Thread.currentThread().interrupt();
                } finally {
                    doneLatch.countDown();
                }
            }).start();
        }

        startLatch.countDown();
        doneLatch.await();

        // Verify all items were polled exactly once
        assertEquals(itemsPerThread * numThreads, totalPolled.get());

  }

  @Override
  void cancelFinalStepAndWait(ClosingFuture<TestCloseable> closingFuture) {
    assertThat(closingFuture.finishToFuture().cancel(false)).isTrue();
    waitUntilClosed(closingFuture);
    futureCancelled.countDown();
  }

          @Override
          public void failure(Service service) {
            failEnter.countDown();
            // block until after the service manager is shutdown
            Uninterruptibles.awaitUninterruptibly(failLeave);
          }
        },
        directExecutor());
    manager.startAsync();
    afterStarted.countDown();
    // We do not call awaitHealthy because, due to races, that method may throw an exception.  But

        req.threadPool(pool);

        // ## Act ##
        req.execute(response -> {
            threadName.set(Thread.currentThread().getName());
            latch.countDown();
        }, e -> {
            latch.countDown();
        });

        // ## Assert ##
        assertTrue("Async execution should complete within 5 seconds", latch.await(5, TimeUnit.SECONDS));
        assertNotNull(threadName.get());

            suggestHelper.indexFromDocuments(ret -> {
                logger.info("Success indexing from documents.");
                latch.countDown();
            }, t -> {
                logger.error("Failed to update suggest index.", t);
                exitCode.set(1);
                latch.countDown();
            });

            try {
                latch.await();
            } catch (final InterruptedException ignore) {

      }

      synchronized(this) {
        this.bytes = publicSuffixListBytes!!
        this.exceptionBytes = publicSuffixExceptionListBytes!!
      }
    } finally {
      readCompleteLatch.countDown()
    }
  }

  abstract fun listSource(): Source

  override fun ensureLoaded() {
    if (!listRead.get() && listRead.compareAndSet(false, true)) {
      readTheListUninterruptibly()
    } else {

                        Thread.currentThread().interrupt();
                    } finally {
                        endLatch.countDown();
                    }
                });
            }

            startLatch.countDown(); // Start all threads
            boolean completed = endLatch.await(10, TimeUnit.SECONDS);
            executor.shutdown();

  fun sendResponse(
    s: String,
    responseSent: CountDownLatch = CountDownLatch(1),
  ) = apply {
    actions += { stream ->
      stream.sink.writeUtf8(s)
      stream.sink.flush()
      responseSent.countDown()
    }
  }

  fun exhaustResponse() =
    apply {
      actions += { stream -> stream.sink.close() }
    }

  fun sleep(
    duration: Long,
    unit: TimeUnit,
  ) = apply {