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"""Tests for asyncio/threads.py"""
import asyncio
import unittest
from contextvars import ContextVar
from unittest import mock
from test.test_asyncio import utils as test_utils
def tearDownModule():
asyncio.set_event_loop_policy(None)
class ToThreadTests(test_utils.TestCase):
def setUp(self):
super().setUp()
self.loop = asyncio.new_event_loop()
asyncio.set_event_loop(self.loop)
def tearDown(self):
self.loop.run_until_complete(
self.loop.shutdown_default_executor())
self.loop.close()
asyncio.set_event_loop(None)
self.loop = None
super().tearDown()
def test_to_thread(self):
async def main():
return await asyncio.to_thread(sum, [40, 2])
result = self.loop.run_until_complete(main())
self.assertEqual(result, 42)
def test_to_thread_exception(self):
def raise_runtime():
raise RuntimeError("test")
async def main():
await asyncio.to_thread(raise_runtime)
with self.assertRaisesRegex(RuntimeError, "test"):
self.loop.run_until_complete(main())
def test_to_thread_once(self):
func = mock.Mock()
async def main():
await asyncio.to_thread(func)
self.loop.run_until_complete(main())
func.assert_called_once()
def test_to_thread_concurrent(self):
func = mock.Mock()
async def main():
futs = []
for _ in range(10):
fut = asyncio.to_thread(func)
futs.append(fut)
await asyncio.gather(*futs)
self.loop.run_until_complete(main())
self.assertEqual(func.call_count, 10)
def test_to_thread_args_kwargs(self):
# Unlike run_in_executor(), to_thread() should directly accept kwargs.
func = mock.Mock()
async def main():
await asyncio.to_thread(func, 'test', something=True)
self.loop.run_until_complete(main())
func.assert_called_once_with('test', something=True)
def test_to_thread_contextvars(self):
test_ctx = ContextVar('test_ctx')
def get_ctx():
return test_ctx.get()
async def main():
test_ctx.set('parrot')
return await asyncio.to_thread(get_ctx)
result = self.loop.run_until_complete(main())
self.assertEqual(result, 'parrot')
if __name__ == "__main__":
unittest.main()
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