import pytest
from fastapi.testclient import TestClient

from app.main import create_app


@pytest.fixture()
def client() -> TestClient:
    return TestClient(create_app())


def test_healthz_ok(client: TestClient) -> None:
    resp = client.get("/healthz")
    assert resp.status_code == 200
    body = resp.json()
    assert body["status"] == "ok"
    assert "env" in body


def test_validation_error_uses_contract_envelope(client: TestClient) -> None:
    # 触发路径参数/请求体校验失败，验证统一错误体结构
    resp = client.post("/healthz", json={"unexpected": 1})
    assert resp.status_code in (405, 422)
    if resp.status_code == 422:
        err = resp.json()["error"]
        assert err["code"] == "validation_failed"
        assert err["details"]["field_errors"]