exceptions[index] = e;
                }
            });
        }

        // Start all threads
        for (Thread thread : threads) {
            thread.start();
        }

        // Wait for all threads to complete
        for (Thread thread : threads) {
            thread.join();
        }

        // Verify no exceptions occurred
        for (int i = 0; i < threadCount; i++) {

        // Multiple threads read the lastLoadedTime
        for (int i = 0; i < 10; i++) {
            final int index = i;
            threads[i] = new Thread(() -> {
                observedTimes[index] = testFactory.lastLoadedTime;
            });
        }

        for (Thread thread : threads) {
            thread.start();
        }

        for (Thread thread : threads) {
            thread.join();
        }

                }
            });
        }

        // Start all threads
        for (Thread thread : threads) {
            thread.start();
        }

        // Wait for all threads to complete
        for (Thread thread : threads) {
            thread.join();
        }

        // Verify no exceptions occurred
        for (int i = 0; i < threadCount; i++) {

            final int index = i;
            threads[i] = new Thread(() -> {
                invertibles[index] = securityResourceProvider.providePrimaryInvertibleCryptographer();
                oneWays[index] = securityResourceProvider.providePrimaryOneWayCryptographer();
            });
            threads[i].start();
        }

        // Wait for all threads to complete
        for (Thread thread : threads) {
            try {

  }

  /**
   * Add a shutdown hook to wait for thread completion in the given {@link ExecutorService service}.
   * This is useful if the given service uses daemon threads, and we want to keep the JVM from
   * exiting immediately on shutdown, instead giving these daemon threads a chance to terminate
   * normally.
   *
   * @param service ExecutorService which uses daemon threads

   * intentionally, so there is no other way to clean up these threads. (The better solution,
   * though, would be to run the tests that use TestThread in separate VMs so that their threads
   * don't hang around during other tests.)
   */
  @Override
  public void tearDown() throws Exception {
    try {
      Thread.class.getMethod("stop").invoke(this);
      join();

        // Wait for all threads to complete
        for (Thread thread : threads) {
            thread.join();
        }

        // Check all providers were created successfully
        for (int i = 0; i < threadCount; i++) {
            assertNull(exceptions[i], "Thread " + i + " threw exception");
            assertNotNull(providers[i], "Thread " + i + " failed to create provider");
        }
    }

   * intentionally, so there is no other way to clean up these threads. (The better solution,
   * though, would be to run the tests that use TestThread in separate VMs so that their threads
   * don't hang around during other tests.)
   */
  @Override
  public void tearDown() throws Exception {
    try {
      Thread.class.getMethod("stop").invoke(this);
      join();

                }
            });
        }

        // Start all threads
        for (Thread thread : threads) {
            thread.start();
        }

        // Wait for all threads to complete
        for (Thread thread : threads) {
            thread.join(5000); // 5 second timeout
        }

        // Verify no errors occurred during concurrent execution
        assertFalse(hasError.get());

  }

  @J2ktIncompatible
  @GwtIncompatible // threads
  public void testRenaming() throws Exception {
    String oldName = Thread.currentThread().getName();
    Supplier<String> newName = Suppliers.ofInstance("MyCrazyThreadName");
    Callable<@Nullable Void> callable =
        () -> {
          assertThat(Thread.currentThread().getName()).isEqualTo(newName.get());
          return null;
        };