import asyncio
import threading

from k1link.fleet.events import FleetEvents


def test_registry_events_cross_thread_coalesce_and_unsubscribe():
    async def check():
        events = FleetEvents()
        queue, close = events.subscribe()
        thread = threading.Thread(target=lambda: [events.notify() for _ in range(20)])
        thread.start()
        thread.join()
        await asyncio.sleep(0)
        assert queue.qsize() == 1
        await queue.get()
        close()
        events.notify()
        await asyncio.sleep(0)
        assert queue.empty()
        assert not events.listeners

    asyncio.run(check())