from app.pipeline.nodes.generate import _format_history


def test_format_history_uses_summary_when_present() -> None:
    state = {
        "conversation_summary": "User asked about PersonaBot architecture and caching.",
        "conversation_history": [
            {"q": "Q1", "a": "A1"},
            {"q": "Q2", "a": "A2"},
        ],
    }

    rendered = _format_history(state)

    assert "Running conversation context:" in rendered
    assert "PersonaBot architecture" in rendered
    assert "Q1" not in rendered


def test_format_history_caps_raw_history_to_three_turns() -> None:
    state = {
        "conversation_summary": None,
        "conversation_history": [
            {"q": "Q1", "a": "A1"},
            {"q": "Q2", "a": "A2"},
            {"q": "Q3", "a": "A3"},
            {"q": "Q4", "a": "A4"},
        ],
    }

    rendered = _format_history(state)

    assert "Q1" not in rendered
    assert "Q2" in rendered
    assert "Q3" in rendered
    assert "Q4" in rendered