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import asyncio
import warnings
import pytest
from twisted.trial.unittest import TestCase
from scrapy.utils.defer import deferred_f_from_coro_f
from scrapy.utils.reactor import (
install_reactor,
is_asyncio_reactor_installed,
set_asyncio_event_loop,
)
@pytest.mark.usefixtures("reactor_pytest")
class TestAsyncio(TestCase):
def test_is_asyncio_reactor_installed(self):
# the result should depend only on the pytest --reactor argument
assert is_asyncio_reactor_installed() == (self.reactor_pytest != "default")
def test_install_asyncio_reactor(self):
from twisted.internet import reactor as original_reactor
with warnings.catch_warnings(record=True) as w:
install_reactor("twisted.internet.asyncioreactor.AsyncioSelectorReactor")
assert len(w) == 0
from twisted.internet import reactor # pylint: disable=reimported
assert original_reactor == reactor
@pytest.mark.only_asyncio
@deferred_f_from_coro_f
async def test_set_asyncio_event_loop(self):
install_reactor("twisted.internet.asyncioreactor.AsyncioSelectorReactor")
assert set_asyncio_event_loop(None) is asyncio.get_running_loop()
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