"""Wave 0：trace_id 测试。"""


def test_health_returns_trace_id(client):
    resp = client.get("/health")
    assert resp.status_code == 200
    assert resp.headers.get("X-Trace-Id")
    assert resp.json()["trace_id"]


def test_trace_id_echo(client):
    resp = client.get("/health", headers={"X-Trace-Id": "trace-fixed-001"})
    assert resp.headers["X-Trace-Id"] == "trace-fixed-001"