"""Unit tests for zeroconf._core"""

from __future__ import annotations

import asyncio
import logging
import os
import socket
import sys
import threading
import time
import unittest
import unittest.mock
import warnings
from typing import cast
from unittest.mock import AsyncMock, Mock, patch

import pytest

import zeroconf as r
from zeroconf import NotRunningException, Zeroconf, const, current_time_millis
from zeroconf._listener import AsyncListener, _WrappedTransport
from zeroconf._protocol.incoming import DNSIncoming
from zeroconf.asyncio import AsyncZeroconf

from . import _clear_cache, _inject_response, _wait_for_start, has_working_ipv6

log = logging.getLogger("zeroconf")
original_logging_level = logging.NOTSET


def setup_module():
    global original_logging_level
    original_logging_level = log.level
    log.setLevel(logging.DEBUG)


def teardown_module():
    if original_logging_level != logging.NOTSET:
        log.setLevel(original_logging_level)


def threadsafe_query(
    zc: Zeroconf,
    protocol: AsyncListener,
    msg: DNSIncoming,
    addr: str,
    port: int,
    transport: _WrappedTransport,
    v6_flow_scope: tuple[()] | tuple[int, int],
) -> None:
    async def make_query():
        protocol.handle_query_or_defer(msg, addr, port, transport, v6_flow_scope)

    assert zc.loop is not None
    asyncio.run_coroutine_threadsafe(make_query(), zc.loop).result()


class Framework(unittest.TestCase):
    @unittest.skipIf(os.environ.get("DEBIAN_TEST"), "disabled by Debian builder")
    def test_launch_and_close(self):
        rv = r.Zeroconf(interfaces=r.InterfaceChoice.All)
        rv.close()
        rv = r.Zeroconf(interfaces=r.InterfaceChoice.Default)
        rv.close()

    @unittest.skipIf(os.environ.get("DEBIAN_TEST"), "disabled by Debian builder")
    def test_launch_and_close_context_manager(self):
        with r.Zeroconf(interfaces=r.InterfaceChoice.All) as rv:
            assert rv.done is False
        assert rv.done is True

        with r.Zeroconf(interfaces=r.InterfaceChoice.Default) as rv:  # type: ignore[unreachable]
            assert rv.done is False
        assert rv.done is True

    def test_launch_and_close_unicast(self):
        rv = r.Zeroconf(interfaces=r.InterfaceChoice.All, unicast=True)
        rv.close()
        rv = r.Zeroconf(interfaces=r.InterfaceChoice.Default, unicast=True)
        rv.close()

    @unittest.skipIf(os.environ.get("DEBIAN_TEST"), "disabled by Debian builder")
    def test_close_multiple_times(self):
        rv = r.Zeroconf(interfaces=r.InterfaceChoice.Default)
        rv.close()
        rv.close()

    @unittest.skipIf(not has_working_ipv6(), "Requires IPv6")
    @unittest.skipIf(os.environ.get("SKIP_IPV6"), "IPv6 tests disabled")
    @unittest.skipIf(os.environ.get("DEBIAN_TEST"), "disabled by Debian builder")
    def test_launch_and_close_v4_v6(self):
        rv = r.Zeroconf(interfaces=r.InterfaceChoice.All, ip_version=r.IPVersion.All)
        rv.close()
        with warnings.catch_warnings(record=True) as warned:
            rv = r.Zeroconf(interfaces=r.InterfaceChoice.Default, ip_version=r.IPVersion.All)
            rv.close()
            first_warning = warned[0]
            assert "IPv6 multicast requests can't be sent using default interface" in str(
                first_warning.message
            )

    @unittest.skipIf(not has_working_ipv6(), "Requires IPv6")
    @unittest.skipIf(os.environ.get("SKIP_IPV6"), "IPv6 tests disabled")
    @unittest.skipIf(os.environ.get("DEBIAN_TEST"), "disabled by Debian builder")
    def test_launch_and_close_v6_only(self):
        rv = r.Zeroconf(interfaces=r.InterfaceChoice.All, ip_version=r.IPVersion.V6Only)
        rv.close()
        with warnings.catch_warnings(record=True) as warned:
            rv = r.Zeroconf(interfaces=r.InterfaceChoice.Default, ip_version=r.IPVersion.V6Only)
            rv.close()
            first_warning = warned[0]
            assert "IPv6 multicast requests can't be sent using default interface" in str(
                first_warning.message
            )

    @unittest.skipIf(sys.platform == "darwin", reason="apple_p2p failure path not testable on mac")
    def test_launch_and_close_apple_p2p_not_mac(self):
        with pytest.raises(RuntimeError):
            r.Zeroconf(apple_p2p=True)

    @unittest.skipIf(sys.platform != "darwin", reason="apple_p2p happy path only testable on mac")
    def test_launch_and_close_apple_p2p_on_mac(self):
        rv = r.Zeroconf(apple_p2p=True)
        rv.close()

    def test_async_updates_from_response(self):
        def mock_incoming_msg(
            service_state_change: r.ServiceStateChange,
        ) -> r.DNSIncoming:
            ttl = 120
            generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)

            if service_state_change == r.ServiceStateChange.Updated:
                generated.add_answer_at_time(
                    r.DNSText(
                        service_name,
                        const._TYPE_TXT,
                        const._CLASS_IN | const._CLASS_UNIQUE,
                        ttl,
                        service_text,
                    ),
                    0,
                )
                return r.DNSIncoming(generated.packets()[0])

            if service_state_change == r.ServiceStateChange.Removed:
                ttl = 0

            generated.add_answer_at_time(
                r.DNSPointer(service_type, const._TYPE_PTR, const._CLASS_IN, ttl, service_name),
                0,
            )
            generated.add_answer_at_time(
                r.DNSService(
                    service_name,
                    const._TYPE_SRV,
                    const._CLASS_IN | const._CLASS_UNIQUE,
                    ttl,
                    0,
                    0,
                    80,
                    service_server,
                ),
                0,
            )
            generated.add_answer_at_time(
                r.DNSText(
                    service_name,
                    const._TYPE_TXT,
                    const._CLASS_IN | const._CLASS_UNIQUE,
                    ttl,
                    service_text,
                ),
                0,
            )
            generated.add_answer_at_time(
                r.DNSAddress(
                    service_server,
                    const._TYPE_A,
                    const._CLASS_IN | const._CLASS_UNIQUE,
                    ttl,
                    socket.inet_aton(service_address),
                ),
                0,
            )

            return r.DNSIncoming(generated.packets()[0])

        def mock_split_incoming_msg(
            service_state_change: r.ServiceStateChange,
        ) -> r.DNSIncoming:
            """Mock an incoming message for the case where the packet is split."""
            ttl = 120
            generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
            generated.add_answer_at_time(
                r.DNSAddress(
                    service_server,
                    const._TYPE_A,
                    const._CLASS_IN | const._CLASS_UNIQUE,
                    ttl,
                    socket.inet_aton(service_address),
                ),
                0,
            )
            generated.add_answer_at_time(
                r.DNSService(
                    service_name,
                    const._TYPE_SRV,
                    const._CLASS_IN | const._CLASS_UNIQUE,
                    ttl,
                    0,
                    0,
                    80,
                    service_server,
                ),
                0,
            )
            return r.DNSIncoming(generated.packets()[0])

        service_name = "name._type._tcp.local."
        service_type = "_type._tcp.local."
        service_server = "ash-2.local."
        service_text = b"path=/~paulsm/"
        service_address = "10.0.1.2"

        zeroconf = r.Zeroconf(interfaces=["127.0.0.1"])

        try:
            # service added
            _inject_response(zeroconf, mock_incoming_msg(r.ServiceStateChange.Added))
            dns_text = zeroconf.cache.get_by_details(service_name, const._TYPE_TXT, const._CLASS_IN)
            assert dns_text is not None
            assert cast(r.DNSText, dns_text).text == service_text  # service_text is b'path=/~paulsm/'
            all_dns_text = zeroconf.cache.get_all_by_details(service_name, const._TYPE_TXT, const._CLASS_IN)
            assert [dns_text] == all_dns_text

            # https://tools.ietf.org/html/rfc6762#section-10.2
            # Instead of merging this new record additively into the cache in addition
            # to any previous records with the same name, rrtype, and rrclass,
            # all old records with that name, rrtype, and rrclass that were received
            # more than one second ago are declared invalid,
            # and marked to expire from the cache in one second.
            time.sleep(1.1)

            # service updated. currently only text record can be updated
            service_text = b"path=/~humingchun/"
            _inject_response(zeroconf, mock_incoming_msg(r.ServiceStateChange.Updated))
            dns_text = zeroconf.cache.get_by_details(service_name, const._TYPE_TXT, const._CLASS_IN)
            assert dns_text is not None
            assert cast(r.DNSText, dns_text).text == service_text  # service_text is b'path=/~humingchun/'

            time.sleep(1.1)

            # The split message only has a SRV and A record.
            # This should not evict TXT records from the cache
            _inject_response(zeroconf, mock_split_incoming_msg(r.ServiceStateChange.Updated))
            time.sleep(1.1)
            dns_text = zeroconf.cache.get_by_details(service_name, const._TYPE_TXT, const._CLASS_IN)
            assert dns_text is not None
            assert cast(r.DNSText, dns_text).text == service_text  # service_text is b'path=/~humingchun/'

            # service removed
            _inject_response(zeroconf, mock_incoming_msg(r.ServiceStateChange.Removed))
            dns_text = zeroconf.cache.get_by_details(service_name, const._TYPE_TXT, const._CLASS_IN)
            assert dns_text is not None
            assert dns_text.is_expired(current_time_millis() + 1000)

        finally:
            zeroconf.close()


def test_generate_service_query_set_qu_bit():
    """Test generate_service_query sets the QU bit."""

    zeroconf_registrar = Zeroconf(interfaces=["127.0.0.1"])
    desc = {"path": "/~paulsm/"}
    type_ = "._hap._tcp.local."
    registration_name = "this-host-is-not-used._hap._tcp.local."
    info = r.ServiceInfo(
        type_,
        registration_name,
        80,
        0,
        0,
        desc,
        "ash-2.local.",
        addresses=[socket.inet_aton("10.0.1.2")],
    )
    out = zeroconf_registrar.generate_service_query(info)
    assert out.questions[0].unicast is True
    zeroconf_registrar.close()


def test_invalid_packets_ignored_and_does_not_cause_loop_exception():
    """Ensure an invalid packet cannot cause the loop to collapse."""
    zc = Zeroconf(interfaces=["127.0.0.1"])
    generated = r.DNSOutgoing(0)
    packet = generated.packets()[0]
    packet = packet[:8] + b"deadbeef" + packet[8:]
    parsed = r.DNSIncoming(packet)
    assert parsed.valid is False

    # Invalid Packet
    mock_out = unittest.mock.Mock()
    mock_out.packets = lambda: [packet]
    zc.send(mock_out)

    # Invalid oversized packet
    mock_out = unittest.mock.Mock()
    mock_out.packets = lambda: [packet * 1000]
    zc.send(mock_out)

    generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
    entry = r.DNSText(
        "didnotcrashincoming._crash._tcp.local.",
        const._TYPE_TXT,
        const._CLASS_IN | const._CLASS_UNIQUE,
        500,
        b"path=/~paulsm/",
    )
    assert isinstance(entry, r.DNSText)
    assert isinstance(entry, r.DNSRecord)
    assert isinstance(entry, r.DNSEntry)

    generated.add_answer_at_time(entry, 0)
    zc.send(generated)
    time.sleep(0.2)
    zc.close()
    assert zc.cache.get(entry) is not None


def test_goodbye_all_services():
    """Verify generating the goodbye query does not change with time."""
    zc = Zeroconf(interfaces=["127.0.0.1"])
    out = zc.generate_unregister_all_services()
    assert out is None
    type_ = "_http._tcp.local."
    registration_name = f"xxxyyy.{type_}"
    desc = {"path": "/~paulsm/"}
    info = r.ServiceInfo(
        type_,
        registration_name,
        80,
        0,
        0,
        desc,
        "ash-2.local.",
        addresses=[socket.inet_aton("10.0.1.2")],
    )
    zc.registry.async_add(info)
    out = zc.generate_unregister_all_services()
    assert out is not None
    first_packet = out.packets()
    zc.registry.async_add(info)
    out2 = zc.generate_unregister_all_services()
    assert out2 is not None
    second_packet = out.packets()
    assert second_packet == first_packet

    # Verify the registry is empty
    out3 = zc.generate_unregister_all_services()
    assert out3 is None
    assert zc.registry.async_get_service_infos() == []

    zc.close()


def test_register_service_with_custom_ttl():
    """Test a registering a service with a custom ttl."""

    # instantiate a zeroconf instance
    zc = Zeroconf(interfaces=["127.0.0.1"])

    # start a browser
    type_ = "_homeassistant._tcp.local."
    name = "MyTestHome"
    info_service = r.ServiceInfo(
        type_,
        f"{name}.{type_}",
        80,
        0,
        0,
        {"path": "/~paulsm/"},
        "ash-90.local.",
        addresses=[socket.inet_aton("10.0.1.2")],
    )

    zc.register_service(info_service, ttl=3000)
    record = zc.cache.get(info_service.dns_pointer())
    assert record is not None
    assert record.ttl == 3000
    zc.close()


def test_logging_packets(caplog):
    """Test packets are only logged with debug logging."""

    # instantiate a zeroconf instance
    zc = Zeroconf(interfaces=["127.0.0.1"])

    # start a browser
    type_ = "_logging._tcp.local."
    name = "TLD"
    info_service = r.ServiceInfo(
        type_,
        f"{name}.{type_}",
        80,
        0,
        0,
        {"path": "/~paulsm/"},
        "ash-90.local.",
        addresses=[socket.inet_aton("10.0.1.2")],
    )

    logging.getLogger("zeroconf").setLevel(logging.DEBUG)
    caplog.clear()
    zc.register_service(info_service, ttl=3000)
    assert "Sending to" in caplog.text
    record = zc.cache.get(info_service.dns_pointer())
    assert record is not None
    assert record.ttl == 3000
    logging.getLogger("zeroconf").setLevel(logging.INFO)
    caplog.clear()
    zc.unregister_service(info_service)
    assert "Sending to" not in caplog.text
    logging.getLogger("zeroconf").setLevel(logging.DEBUG)

    zc.close()


def test_get_service_info_failure_path():
    """Verify get_service_info return None when the underlying call returns False."""
    zc = Zeroconf(interfaces=["127.0.0.1"])
    assert zc.get_service_info("_neverused._tcp.local.", "xneverused._neverused._tcp.local.", 10) is None
    zc.close()


def test_sending_unicast():
    """Test sending unicast response."""
    zc = Zeroconf(interfaces=["127.0.0.1"])
    generated = r.DNSOutgoing(const._FLAGS_QR_RESPONSE)
    entry = r.DNSText(
        "didnotcrashincoming._crash._tcp.local.",
        const._TYPE_TXT,
        const._CLASS_IN | const._CLASS_UNIQUE,
        500,
        b"path=/~paulsm/",
    )
    generated.add_answer_at_time(entry, 0)
    zc.send(generated, "2001:db8::1", const._MDNS_PORT)  # https://www.iana.org/go/rfc3849
    time.sleep(0.2)
    assert zc.cache.get(entry) is None

    zc.send(generated, "198.51.100.0", const._MDNS_PORT)  # Documentation (TEST-NET-2)
    time.sleep(0.2)
    assert zc.cache.get(entry) is None

    zc.send(generated)

    # Handle slow github CI runners on windows
    for _ in range(10):
        time.sleep(0.05)
        if zc.cache.get(entry) is not None:
            break

    assert zc.cache.get(entry) is not None

    zc.close()


def test_tc_bit_defers():
    zc = Zeroconf(interfaces=["127.0.0.1"])
    _wait_for_start(zc)
    type_ = "_tcbitdefer._tcp.local."
    name = "knownname"
    name2 = "knownname2"
    name3 = "knownname3"

    registration_name = f"{name}.{type_}"
    registration2_name = f"{name2}.{type_}"
    registration3_name = f"{name3}.{type_}"

    desc = {"path": "/~paulsm/"}
    server_name = "ash-2.local."
    server_name2 = "ash-3.local."
    server_name3 = "ash-4.local."

    info = r.ServiceInfo(
        type_,
        registration_name,
        80,
        0,
        0,
        desc,
        server_name,
        addresses=[socket.inet_aton("10.0.1.2")],
    )
    info2 = r.ServiceInfo(
        type_,
        registration2_name,
        80,
        0,
        0,
        desc,
        server_name2,
        addresses=[socket.inet_aton("10.0.1.2")],
    )
    info3 = r.ServiceInfo(
        type_,
        registration3_name,
        80,
        0,
        0,
        desc,
        server_name3,
        addresses=[socket.inet_aton("10.0.1.2")],
    )
    zc.registry.async_add(info)
    zc.registry.async_add(info2)
    zc.registry.async_add(info3)

    protocol = zc.engine.protocols[0]
    now = r.current_time_millis()
    _clear_cache(zc)

    generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
    question = r.DNSQuestion(type_, const._TYPE_PTR, const._CLASS_IN)
    generated.add_question(question)
    for _ in range(300):
        # Add so many answers we end up with another packet
        generated.add_answer_at_time(info.dns_pointer(), now)
    generated.add_answer_at_time(info2.dns_pointer(), now)
    generated.add_answer_at_time(info3.dns_pointer(), now)
    packets = generated.packets()
    assert len(packets) == 4
    expected_deferred = []
    source_ip = "203.0.113.13"

    next_packet = r.DNSIncoming(packets.pop(0))
    expected_deferred.append(next_packet)
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert protocol._deferred[source_ip] == expected_deferred
    assert source_ip in protocol._timers

    next_packet = r.DNSIncoming(packets.pop(0))
    expected_deferred.append(next_packet)
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert protocol._deferred[source_ip] == expected_deferred
    assert source_ip in protocol._timers
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert protocol._deferred[source_ip] == expected_deferred
    assert source_ip in protocol._timers

    next_packet = r.DNSIncoming(packets.pop(0))
    expected_deferred.append(next_packet)
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert protocol._deferred[source_ip] == expected_deferred
    assert source_ip in protocol._timers

    next_packet = r.DNSIncoming(packets.pop(0))
    expected_deferred.append(next_packet)
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert source_ip not in protocol._deferred
    assert source_ip not in protocol._timers

    # unregister
    zc.unregister_service(info)
    zc.close()


def test_tc_bit_defers_last_response_missing():
    zc = Zeroconf(interfaces=["127.0.0.1"])
    _wait_for_start(zc)
    type_ = "_knowndefer._tcp.local."
    name = "knownname"
    name2 = "knownname2"
    name3 = "knownname3"

    registration_name = f"{name}.{type_}"
    registration2_name = f"{name2}.{type_}"
    registration3_name = f"{name3}.{type_}"

    desc = {"path": "/~paulsm/"}
    server_name = "ash-2.local."
    server_name2 = "ash-3.local."
    server_name3 = "ash-4.local."

    info = r.ServiceInfo(
        type_,
        registration_name,
        80,
        0,
        0,
        desc,
        server_name,
        addresses=[socket.inet_aton("10.0.1.2")],
    )
    info2 = r.ServiceInfo(
        type_,
        registration2_name,
        80,
        0,
        0,
        desc,
        server_name2,
        addresses=[socket.inet_aton("10.0.1.2")],
    )
    info3 = r.ServiceInfo(
        type_,
        registration3_name,
        80,
        0,
        0,
        desc,
        server_name3,
        addresses=[socket.inet_aton("10.0.1.2")],
    )
    zc.registry.async_add(info)
    zc.registry.async_add(info2)
    zc.registry.async_add(info3)

    protocol = zc.engine.protocols[0]
    now = r.current_time_millis()
    _clear_cache(zc)
    source_ip = "203.0.113.12"

    generated = r.DNSOutgoing(const._FLAGS_QR_QUERY)
    question = r.DNSQuestion(type_, const._TYPE_PTR, const._CLASS_IN)
    generated.add_question(question)
    for _ in range(300):
        # Add so many answers we end up with another packet
        generated.add_answer_at_time(info.dns_pointer(), now)
    generated.add_answer_at_time(info2.dns_pointer(), now)
    generated.add_answer_at_time(info3.dns_pointer(), now)
    packets = generated.packets()
    assert len(packets) == 4
    expected_deferred = []

    next_packet = r.DNSIncoming(packets.pop(0))
    expected_deferred.append(next_packet)
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert protocol._deferred[source_ip] == expected_deferred
    timer1 = protocol._timers[source_ip]

    next_packet = r.DNSIncoming(packets.pop(0))
    expected_deferred.append(next_packet)
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert protocol._deferred[source_ip] == expected_deferred
    timer2 = protocol._timers[source_ip]
    assert timer1.cancelled()
    assert timer2 != timer1

    # Send the same packet again to similar multi interfaces
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert protocol._deferred[source_ip] == expected_deferred
    assert source_ip in protocol._timers
    timer3 = protocol._timers[source_ip]
    assert not timer3.cancelled()
    assert timer3 == timer2

    next_packet = r.DNSIncoming(packets.pop(0))
    expected_deferred.append(next_packet)
    threadsafe_query(zc, protocol, next_packet, source_ip, const._MDNS_PORT, Mock(), ())
    assert protocol._deferred[source_ip] == expected_deferred
    assert source_ip in protocol._timers
    timer4 = protocol._timers[source_ip]
    assert timer3.cancelled()
    assert timer4 != timer3

    for _ in range(8):
        time.sleep(0.1)
        if source_ip not in protocol._timers and source_ip not in protocol._deferred:
            break

    assert source_ip not in protocol._deferred
    assert source_ip not in protocol._timers

    # unregister
    zc.registry.async_remove(info)
    zc.close()


@pytest.mark.asyncio
async def test_open_close_twice_from_async() -> None:
    """Test we can close twice from a coroutine when using Zeroconf.

    Ideally callers switch to using AsyncZeroconf, however there will
    be a period where they still call the sync wrapper that we want
    to ensure will not deadlock on shutdown.

    This test is expected to throw warnings about tasks being destroyed
    since we force shutdown right away since we don't want to block
    callers event loops and since they aren't using the AsyncZeroconf
    version they won't yield with an await like async_close we don't
    have much choice but to force things down.
    """
    zc = Zeroconf(interfaces=["127.0.0.1"])
    zc.close()
    zc.close()
    await asyncio.sleep(0)


@pytest.mark.asyncio
async def test_multiple_sync_instances_stared_from_async_close():
    """Test we can shutdown multiple sync instances from async."""

    # instantiate a zeroconf instance
    zc = Zeroconf(interfaces=["127.0.0.1"])
    zc2 = Zeroconf(interfaces=["127.0.0.1"])
    assert zc.loop is not None
    assert zc2.loop is not None

    assert zc.loop == zc2.loop
    zc.close()
    assert zc.loop.is_running()
    zc2.close()
    assert zc2.loop.is_running()

    zc3 = Zeroconf(interfaces=["127.0.0.1"])
    assert zc3.loop == zc2.loop

    zc3.close()
    assert zc3.loop.is_running()

    await asyncio.sleep(0)


def test_shutdown_while_register_in_process():
    """Test we can shutdown while registering a service in another thread."""

    # instantiate a zeroconf instance
    zc = Zeroconf(interfaces=["127.0.0.1"])

    # start a browser
    type_ = "_homeassistant._tcp.local."
    name = "MyTestHome"
    info_service = r.ServiceInfo(
        type_,
        f"{name}.{type_}",
        80,
        0,
        0,
        {"path": "/~paulsm/"},
        "ash-90.local.",
        addresses=[socket.inet_aton("10.0.1.2")],
    )

    def _background_register():
        zc.register_service(info_service)

    bgthread = threading.Thread(target=_background_register, daemon=True)
    bgthread.start()
    time.sleep(0.3)

    zc.close()
    bgthread.join()


@pytest.mark.asyncio
@patch("zeroconf._core._STARTUP_TIMEOUT", 0)
@patch("zeroconf._core.AsyncEngine._async_setup", new_callable=AsyncMock)
async def test_event_loop_blocked(mock_start):
    """Test we raise NotRunningException when waiting for startup that times out."""
    aiozc = AsyncZeroconf(interfaces=["127.0.0.1"])
    with pytest.raises(NotRunningException):
        await aiozc.zeroconf.async_wait_for_start()
    assert aiozc.zeroconf.started is False