assertEquals("Q3", request.getMessages().get(0).getContent());
        assertEquals("A3", request.getMessages().get(1).getContent());
    }

    @Test
    public void test_addHistoryWithBudget_turnBasedPacking_standaloneUserMessage() {
        // A user message not followed by assistant is treated as standalone turn
        final List<LlmMessage> history = new ArrayList<>();