messages = new ArrayList<>();
    }

    public int getMessageCount() {
        return messages.size();
    }

    public String getMessage(int i) {
        return messages.get(i);
    }

    public List<String> getMessages() {
        return Collections.unmodifiableList(messages);
    }

    public void addMessage(String message) {
        messages.add(message);
    }

    }

    /**
     * Returns a copy of the message list in this session.
     *
     * @return a new list containing all messages
     */
    public List<ChatMessage> getMessages() {
        synchronized (messagesLock) {
            if (messages == null) {
                return new ArrayList<>();
            }
            return new ArrayList<>(messages);
        }
    }

     * Gets the messages in this request.
     *
     * @return the list of messages
     */
    public List<LlmMessage> getMessages() {
        return messages;
    }

    /**
     * Sets the messages in this request.
     *
     * @param messages the list of messages
     */
    public void setMessages(final List<LlmMessage> messages) {
        this.messages = messages;
    }

    /**
     * Gets the model name.

        assertSame(request, result);
        assertEquals(1, request.getMessages().size());
        assertEquals(LlmMessage.ROLE_SYSTEM, request.getMessages().get(0).getRole());
        assertEquals("System prompt", request.getMessages().get(0).getContent());
    }

    @Test
    public void test_addUserMessage() {
        final LlmChatRequest request = new LlmChatRequest();

        String fullMessage = message + "\n" + "Exception: "
                + e.getClass().getName() + "\n" + "Message: "
                + e.getMessage() + "\n" + "Stack trace:\n"
                + stackTrace;

        processingEnv.getMessager().printMessage(Diagnostic.Kind.ERROR, fullMessage);
    }

        // Then
        assertTrue(exception.getMessage().toLowerCase().contains("sharing") || exception.getMessage().toLowerCase().contains("violation")
                || exception.getMessage().toLowerCase().contains("used") || exception.getMessage().toLowerCase().contains("being used")
                || exception.getMessage().toLowerCase().contains("process"));
    }

    @Test

        // Messages should remain as provided
        assertEquals(message1, exception1.getMessage());
        assertEquals(message2, exception2.getMessage());

        // Messages should not be affected by cause
        assertFalse(exception1.getMessage().equals(exception2.getMessage()));
    }

    @Test
    public void test_longMessage() {
        // Test with very long message

        assertTrue(exception.getMessage().contains(cause.getClass().getName()));
        assertTrue(exception.getMessage().contains("Cause exception"));
    }

    @Test
    public void test_constructor_withNullMessage() {
        // Test constructor with null message
        FessSystemException exception = new FessSystemException((String) null);

        assertNull(exception.getMessage());
        assertNull(exception.getCause());

        assertNotSame(exception1, exception2);
        assertFalse(exception1.getMessage().equals(exception2.getMessage()));
        assertEquals("User is not found: user1", exception1.getMessage());
        assertEquals("User is not found: user2", exception2.getMessage());
    }

        // Test that getMessage returns the same value consistently
        String message = "Consistent message";
        UnsupportedSearchException exception = new UnsupportedSearchException(message);

        String firstCall = exception.getMessage();
        String secondCall = exception.getMessage();
        String thirdCall = exception.getMessage();

        assertEquals(firstCall, secondCall);