assertEquals("A2", request.getMessages().get(1).getContent());
    }

    // ========== addHistoryWithBudget — turn-based packing tests ==========

    @Test
    public void test_addHistoryWithBudget_turnBasedPacking_twoCompleteTurns() {
        final List<LlmMessage> history = new ArrayList<>();
        history.add(LlmMessage.user("Q1")); // 2
        history.add(LlmMessage.assistant("A1")); // 2