import os
from pathlib import Path
import subprocess
import sys


def test_watchdog_exits_a_process_with_stalled_event_loop(tmp_path):
    # A blocked event loop cannot run coroutine-based timeout handlers.
    code = """import time
from src.core.health import start_watchdog
start_watchdog(grace_seconds=0.1, interval=0.02)
time.sleep(10)
"""
    result = subprocess.run([sys.executable, "-c", code], cwd=Path(__file__).resolve().parents[1],
                            env=dict(os.environ, HEARTBEAT_FILE=str(tmp_path / "absent")),
                            capture_output=True, timeout=8)
    assert result.returncode == 1
    assert b"Heartbeat expired" in result.stderr


def test_stopped_watchdog_allows_normal_shutdown(tmp_path):
    code = """import time
from src.core.health import start_watchdog
stopped = start_watchdog(grace_seconds=0.1, interval=0.02)
stopped.set()
time.sleep(0.2)
"""
    result = subprocess.run([sys.executable, "-c", code], cwd=Path(__file__).resolve().parents[1],
                            env=dict(os.environ, HEARTBEAT_FILE=str(tmp_path / "absent")),
                            capture_output=True, timeout=8)
    assert result.returncode == 0