// Close the authenticator
        auth.close();

        // All these operations should throw IllegalStateException
        assertThrows(IllegalStateException.class, () -> auth.getPassword());
        assertThrows(IllegalStateException.class, () -> auth.getPasswordAsCharArray());
        assertThrows(IllegalStateException.class, () -> {
            // This would normally be called during authentication

     */
    private Mac createMacInstance() throws GeneralSecurityException {
        if (this.closed) {
            throw new IllegalStateException("SigningDigest is closed");
        }
        if (this.signingKey == null) {
            throw new IllegalStateException("Signing key has been wiped");
        }
        Mac m;
        if (this.provider != null) {

     * Gets a buffer from the cache or creates a new one if the cache is empty.
     *
     * Performance: O(1) operation using concurrent queue
     *
     * @return a byte buffer for SMB operations
     * @throws IllegalStateException if buffer size exceeds maximum allowed
     */
    static public byte[] getBuffer() {
        // Try to get from cache first - O(1) operation
        byte[] buf = bufferQueue.poll();
        if (buf != null) {

        // Operations should fail after destroy
        assertThrows(IllegalStateException.class, () -> {
            storage.encryptCredentials(plaintext);
        }, "Should throw IllegalStateException after destroy");

        assertThrows(IllegalStateException.class, () -> {
            storage.decryptCredentials(encrypted);
        }, "Should throw IllegalStateException after destroy");

        // Clean up

        this.valid = true;
    }

    /**
     * Get the underlying buffer
     *
     * @return memory buffer
     * @throws IllegalStateException if memory region has been invalidated
     */
    public ByteBuffer getBuffer() {
        if (!valid) {
            throw new IllegalStateException("Memory region invalidated");
        }
        return buffer;
    }

    /**
     * Get local memory key
     *

        listener.onFailure(this, null, response)
        return
      }

      val body = response.body

      if (!body.isEventStream()) {
        listener.onFailure(
          this,
          IllegalStateException("Invalid content-type: ${body.contentType()}"),
          response,
        )
        return
      }

      // This is a long-lived response. Cancel full-call timeouts.
      call?.timeout()?.cancel()

          future.completeExceptionally(e);
        }
      }

      @Override
      public void onClosed(@NotNull EventSource eventSource) {
        future.completeExceptionally(new IllegalStateException("closed"));
      }

      @Override
      public void onFailure(@NotNull EventSource eventSource, @Nullable Throwable t, @Nullable Response response) {

        ResourceManager.ManagedResource<TestResource> managed = resourceManager.manage(resource);

        managed.close();
        assertTrue(resource.isClosed());

        assertThrows(IllegalStateException.class, managed::get);
    }

    @Test
    @DisplayName("Test resource unregistration")
    void testResourceUnregistration() {
        TestResource resource = new TestResource("test5");

    }

    /**
     * Test constructor with null message and valid cause
     */
    public void test_constructor_withNullMessageAndValidCause() {
        Exception cause = new IllegalStateException("State error");
        CrawlerSystemException exception = new CrawlerSystemException(null, cause);

        assertNotNull(exception);
        assertNull(exception.getMessage());

        if (keyManager != null) {
            String encKeyId = sessionId + "-enc";
            byte[] key = keyManager.getRawKey(encKeyId);
            if (key == null) {
                throw new IllegalStateException("Encryption key not found in SecureKeyManager");
            }
            return key;
        }
        return this.encryptionKey;
    }

    private byte[] getDecryptionKey() {