assertEquals(LlmMessage.ROLE_USER, request.getMessages().get(0).getRole());
        assertEquals("User question", request.getMessages().get(0).getContent());
    }

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

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

        assertSame(request, result);