}

    @Test
    public void test_assistantFactory() {
        final LlmMessage message = LlmMessage.assistant("Assistant response");
        assertEquals(LlmMessage.ROLE_ASSISTANT, message.getRole());
        assertEquals("Assistant response", message.getContent());
    }

    @Test
    public void test_settersAndGetters() {
        final LlmMessage message = new LlmMessage();

        return new LlmMessage(ROLE_USER, content);
    }

    /**
     * Creates an assistant message with the specified content.
     *
     * @param content the message content
     * @return a new assistant message
     */
    public static LlmMessage assistant(final String content) {
        return new LlmMessage(ROLE_ASSISTANT, content);
    }

    /**
     * Gets the message role.

     *
     * @param content the message content
     */
    public void addUserMessage(final String content) {
        addMessage(ChatMessage.userMessage(content));
    }

    /**
     * Adds an assistant message to this session.
     *
     * @param content the message content
     */
    public void addAssistantMessage(final String content) {
        addMessage(ChatMessage.assistantMessage(content));
    }

        message.setId("msg-123");
        message.setRole("assistant");
        message.setContent("Test content");
        message.setTimestamp(timestamp);
        message.setSources(sources);

        assertEquals("msg-123", message.getId());
        assertEquals("assistant", message.getRole());
        assertEquals("Test content", message.getContent());

        return this;
    }

    /**
     * Adds an assistant message to the request.
     *
     * @param content the message content
     * @return this request for method chaining
     */
    public LlmChatRequest addAssistantMessage(final String content) {
        messages.add(LlmMessage.assistant(content));
        return this;
    }

    /**
     * Gets the messages in this request.

        // Third invocation
        curtainFinallyHook.hook(assistantDirector);

        // All invocations should complete successfully
        assertTrue(true);
    }

    // Test with null assistant director (edge case)
    @Test
    public void test_hook_withNullAssistantDirector() {
        // Hook should handle null parameter gracefully
        curtainFinallyHook.hook(null);

- This project supports up to 21 languages. When modifying user-facing strings, error codes, or labels, always propagate changes to ALL language files (fess_label_*.properties and frontend i18n files).

## Important Patterns for AI Assistants

### Do's
1. Use `@Resource` for field injection (not constructor injection)
2. Access helpers via `ComponentUtil.getXyzHelper()`
3. Use `OptionalEntity<T>` for nullable entity returns