assertEquals(ChatMessage.ROLE_ASSISTANT, messages.get(1).getRole());
        assertEquals("Assistant 2", messages.get(1).getContent());
    }

    @Test
    public void test_trimHistoryAllUserMessages() {
        final ChatSession session = new ChatSession();
        session.addUserMessage("User 1");
        session.addUserMessage("User 2");
        session.addUserMessage("User 3");