import pathlib
ROOT=pathlib.Path(__file__).resolve().parents[1]

def test_version_401():
    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.1"

def test_chat_has_independent_heartbeat_wrapper():
    route=(ROOT/"routes"/"chat.py").read_text(encoding="utf-8")
    assert "async def _stream_with_heartbeat" in route
    assert 'yield ": heartbeat\\n\\n"' in route
    assert "heartbeat_seconds=8.0" in route
    assert '"Cache-Control":"no-cache, no-transform"' in route
    assert '"Connection":"keep-alive"' in route

def test_stream_errors_are_sent_as_sse():
    route=(ROOT/"routes"/"chat.py").read_text(encoding="utf-8")
    assert '"event: error\\ndata: "' in route
    assert "json.dumps" in route

def test_frontend_distinguishes_transport_drop():
    js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
    assert "浏览器与服务端的流式连接断开" in js
    assert "流式连接已中断" in js