"""pytest 全局配置：把 tests/ 加入 sys.path（供 ``import mock_llm``）与共享 fixtures。"""
from __future__ import annotations

import sys
from pathlib import Path

import pytest

_TESTS_DIR = Path(__file__).resolve().parent
if str(_TESTS_DIR) not in sys.path:
    sys.path.insert(0, str(_TESTS_DIR))


@pytest.fixture
def tmp_home(tmp_path, monkeypatch):
    """把 ~/.quercus 定向到临时目录（经 QUERCUS_HOME 覆盖）。"""
    home = tmp_path / "home"
    monkeypatch.setenv("QUERCUS_HOME", str(home))
    return home


@pytest.fixture
def fake_png():
    """最小 PNG 头 + 填充字节；core 只流转字节，不解码。"""
    return b"\x89PNG\r\n\x1a\n" + bytes(range(64))