"""Cubre el endpoint /health: respuesta 200 con la BD viva, 503 cuando cae."""
from unittest.mock import patch

from fastapi.testclient import TestClient


def test_health_db_up_returns_200(client: TestClient) -> None:
    response = client.get("/health")
    assert response.status_code == 200
    assert response.json() == {"status": "ok", "db": "up"}


def test_health_db_down_returns_503(client: TestClient) -> None:
    with patch("app.main.db_alive", return_value=False):
        response = client.get("/health")
    assert response.status_code == 503
    body = response.json()
    assert body["status"] == "degraded"
    assert body["db"] == "down"


def test_health_propagates_correlation_id(client: TestClient) -> None:
    cid = "test-cid-12345"
    response = client.get("/health", headers={"X-Correlation-ID": cid})
    assert response.headers.get("X-Correlation-ID") == cid


def test_health_generates_correlation_id_when_absent(client: TestClient) -> None:
    response = client.get("/health")
    assert response.headers.get("X-Correlation-ID")