// Create: user, assistant, user, assistant, user, assistant (6 messages)
        session.addUserMessage("User 1");
        session.addAssistantMessage("Assistant 1");
        session.addUserMessage("User 2");
        session.addAssistantMessage("Assistant 2");
        session.addUserMessage("User 3");
        session.addAssistantMessage("Assistant 3");
        assertEquals(6, session.getMessageCount());

    public static final String ROLE_USER = "user";

    /** The role identifier for assistant messages. */
    public static final String ROLE_ASSISTANT = "assistant";

    /** The unique identifier for this message. */
    private String id;

    /** The role of the message sender (user or assistant). */
    private String role;

    /** The content of the message. */
    private String content;

        final LlmChatRequest result = request.addAssistantMessage("Assistant response");

        assertSame(request, result);
        assertEquals(1, request.getMessages().size());
        assertEquals(LlmMessage.ROLE_ASSISTANT, request.getMessages().get(0).getRole());
        assertEquals("Assistant response", request.getMessages().get(0).getContent());
    }

    @Test

        assertEquals("Q1", history.get(0).getContent());
        assertEquals("assistant", history.get(1).getRole());
        assertEquals("A1", history.get(1).getContent());
        assertEquals("user", history.get(2).getRole());
        assertEquals("Q2", history.get(2).getContent());
        assertEquals("assistant", history.get(3).getRole());
        assertEquals("A2", history.get(3).getContent());
    }

    }

    @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.

        assertFalse(userMessage.isAssistant());
        assertTrue(assistantMessage.isAssistant());
        assertFalse(unknownMessage.isAssistant());
    }

    @Test
    public void test_roleConstants() {
        assertEquals("user", ChatMessage.ROLE_USER);
        assertEquals("assistant", ChatMessage.ROLE_ASSISTANT);
    }

    @Test

     *
     * @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));
    }

        history.add(LlmMessage.user("Q1"));
        history.add(LlmMessage.assistant("A1"));
        history.add(LlmMessage.user("Q2"));
        history.add(LlmMessage.assistant("A2"));
        history.add(LlmMessage.user("Q3"));
        history.add(LlmMessage.assistant("A3"));
        history.add(LlmMessage.user("Q4"));
        history.add(LlmMessage.assistant("A4"));

    /**
     * Gets the maximum characters for assistant message in history.
     *
     * @return the maximum characters
     */
    default int getHistoryAssistantMaxChars() {
        return 800;
    }

    /**
     * Gets the maximum characters for assistant summary in history.
     *
     * @return the maximum characters
     */