verify(mockDelegate).withGuestCrendentials();
    }

    @Test
    void testRenewCredentials_True() {
        // Test renewCredentials(String locationHint, Throwable error) method when true
        String locationHint = "testLocation";
        Throwable error = new RuntimeException("testError");
        when(mockDelegate.renewCredentials(locationHint, error)).thenReturn(true);

  public void testForwardExceptionFastPath() throws Exception {
    class FailFuture extends InternalFutureFailureAccess implements ListenableFuture<String> {
      final Throwable failure;

      FailFuture(Throwable throwable) {
        failure = throwable;
      }

      @Override
      public boolean cancel(boolean mayInterruptIfRunning) {

  /** Causes teardown to execute. */
  public final void runTearDown() {
    List<Throwable> exceptions = new ArrayList<>();
    List<TearDown> stackCopy;
    synchronized (lock) {
      stackCopy = new ArrayList<>(stack);
      stack.clear();
    }
    for (TearDown tearDown : stackCopy) {
      try {
        tearDown.tearDown();
      } catch (Throwable t) {
        if (suppressThrows) {

  /** Causes teardown to execute. */
  public final void runTearDown() {
    List<Throwable> exceptions = new ArrayList<>();
    List<TearDown> stackCopy;
    synchronized (lock) {
      stackCopy = new ArrayList<>(stack);
      stack.clear();
    }
    for (TearDown tearDown : stackCopy) {
      try {
        tearDown.tearDown();
      } catch (Throwable t) {
        if (suppressThrows) {

    /**
     * Extracts and returns the stack trace from a throwable as a string.
     * The stack trace is abbreviated if it exceeds the configured maximum length.
     *
     * @param t the throwable to extract the stack trace from
     * @return the stack trace as a string, or empty string if extraction fails
     */
    private String getStackTrace(final Throwable t) {

        // to currentFuture doesn't race with itself so that currentFuture is assigned in the
        // correct order.
        Throwable scheduleFailure = null;
        Cancellable toReturn;
        lock.lock();
        try {
          toReturn = initializeOrUpdateCancellationDelegate(schedule);
        } catch (Throwable e) {
          // Any Exception is either a RuntimeException or sneaky checked exception.
          //

                  // which case we should skip right down to shutdown.
                  if (isRunning()) {
                    try {
                      AbstractExecutionThreadService.this.run();
                    } catch (Throwable t) {
                      restoreInterruptIfIsInterruptedException(t);
                      try {
                        shutDown();
                      } catch (Exception ignored) {

   * so tests pass on GraalVM, where suppressed exceptions are silently discarded.
   *
   * https://github.com/oracle/graal/issues/3008
   */
  @JvmStatic
  fun Throwable.assertSuppressed(block: (List<@JvmSuppressWildcards Throwable>) -> Unit) {
    if (isGraalVmImage) return
    block(suppressed.toList())
  }

  @JvmStatic
  fun threadFactory(name: String): ThreadFactory =
    object : ThreadFactory {

      return lengthIfKnown.get();
    }

    Closer closer = Closer.create();
    try {
      Reader reader = closer.register(openStream());
      return countBySkipping(reader);
    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  private long countBySkipping(Reader reader) throws IOException {
    long count = 0;
    long read;

      return lengthIfKnown.get();
    }

    Closer closer = Closer.create();
    try {
      Reader reader = closer.register(openStream());
      return countBySkipping(reader);
    } catch (Throwable e) {
      throw closer.rethrow(e);
    } finally {
      closer.close();
    }
  }

  private long countBySkipping(Reader reader) throws IOException {
    long count = 0;
    long read;