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group_fqcd_jr/tests/unit/api/test_sse_accept_negotiation.py
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"""SSE `Accept` 契约测试(文档 §3.2 请求头表 + §3.5 状态码 + §6.4 主要错误)。
权威规则:`Accept` **非必填**,"默认 `application/json`;SSE 为 `text/event-stream`",
`SSE_NOT_ACCEPTABLE` 是 SSE 接口的主要错误之一(406)。
覆盖两条容易写错的分支:
1. **未携带** `Accept` 必须放行——把"未携带"当成"不接受"会把所有默认客户端挡在门外;
2. `q=0` 属于显式拒绝,不能被通配符掩盖。
校验顺序另在 `stream_agent_run_events` 中做了断言:可见性(RUN_NOT_FOUND)先行,
否则 406/404 的差异就等于一次运行存在性枚举。
"""
from typing import Any
import pytest
from fastapi.testclient import TestClient
from app.api.controllers.agent_runs import accepts_event_stream
from app.api.dependencies.auth import build_request_context
from app.core.contracts import RequestContext
from app.core.errors import RunNotFoundError
from app.main import create_app
from app.service.run_query_service import RunSnapshot
EVENTS_PATH = "/api/v1/agent-runs/run-1/events"
async def resolve_context() -> RequestContext:
return RequestContext(user_id="1", trace_id="trace-1", permissions=("agent:run",))
def app_with_query(monkeypatch: pytest.MonkeyPatch, query: Any) -> TestClient:
application = create_app()
application.dependency_overrides[build_request_context] = resolve_context
monkeypatch.setattr("app.api.controllers.agent_runs.RunQueryService", lambda: query)
return TestClient(application)
class StubQuery:
"""`get` 返回终态快照、`watch` 立即收流,避免测试连接挂住。"""
def __init__(self, status: str = "succeeded") -> None:
self.status = status
async def get(self, run_id: str, _ctx: RequestContext) -> RunSnapshot:
return RunSnapshot(run_id=run_id, trace_id="trace-1", status=self.status,
agent_type="customer_service", session_id="s", result=None,
error_code=None, created_at="2026-01-01T00:00:00Z",
completed_at="2026-01-01T00:00:01Z")
async def watch(self, initial: RunSnapshot, _ctx: RequestContext):
yield initial
class MissingQuery:
async def get(self, _run_id: str, _ctx: RequestContext) -> RunSnapshot:
raise RunNotFoundError("运行不存在或不可见")
async def watch(self, initial: RunSnapshot, _ctx: RequestContext):
yield initial
@pytest.mark.parametrize(
"accept",
[None, "", "*/*", "text/*", "text/event-stream", "text/event-stream;q=0.8",
"application/json, text/event-stream"],
)
def test_acceptable_or_absent_accept_is_allowed(accept: str | None) -> None:
assert accepts_event_stream(accept) is True
@pytest.mark.parametrize(
"accept",
["application/json", "text/html", "application/json, text/html",
"*/*;q=0", "text/event-stream;q=0", "text/*;q=0, application/json"],
)
def test_explicitly_unacceptable_accept_is_rejected(accept: str) -> None:
assert accepts_event_stream(accept) is False
@pytest.mark.parametrize("accept", [None, "*/*", "text/event-stream"])
def test_missing_wildcard_and_exact_accept_are_allowed_by_endpoint(
monkeypatch: pytest.MonkeyPatch, accept: str | None
) -> None:
headers = {} if accept is None else {"Accept": accept}
with app_with_query(monkeypatch, StubQuery()) as client:
response = client.get(EVENTS_PATH, headers=headers)
assert response.status_code == 200
assert response.headers["content-type"].startswith("text/event-stream")
def test_json_only_accept_is_rejected_with_documented_code(
monkeypatch: pytest.MonkeyPatch
) -> None:
with app_with_query(monkeypatch, StubQuery()) as client:
response = client.get(EVENTS_PATH, headers={"Accept": "application/json"})
assert response.status_code == 406
assert response.json()["error"]["code"] == "SSE_NOT_ACCEPTABLE"
assert response.json()["error"]["retryable"] is False
assert response.json()["error"]["field_errors"] == []
def test_visibility_is_checked_before_accept(
monkeypatch: pytest.MonkeyPatch
) -> None:
"""不可见运行的非法 Accept 也必须得到 `RUN_NOT_FOUND`,不泄露存在性差异。"""
cases = [{"Accept": "application/json"}, {}]
for headers in cases:
with app_with_query(monkeypatch, MissingQuery()) as client:
response = client.get(EVENTS_PATH, headers=headers)
assert response.status_code == 404
assert response.json()["error"]["code"] == "RUN_NOT_FOUND"
def test_unacceptable_accept_does_not_start_a_stream(
monkeypatch: pytest.MonkeyPatch
) -> None:
"""拒绝必须发生在响应头发送前:文档 §6.4 要求此时返回统一 JSON 错误。"""
with app_with_query(monkeypatch, StubQuery()) as client:
response = client.get(EVENTS_PATH, headers={"Accept": "application/json"})
assert response.headers["content-type"].startswith("application/json")