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();

        final LlmChatRequest result = request.addUserMessage("User question");

        assertSame(request, result);

        session.addMessage(message);

        assertNotNull(session.getMessages());
        assertEquals(1, session.getMessages().size());
    }

    @Test
    public void test_addUserMessage() {
        final ChatSession session = new ChatSession();
        session.addUserMessage("User message content");

        assertEquals(1, session.getMessages().size());