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"""Tests for asyncio/threads.py"""
import asyncio
import unittest
from contextvars import ContextVar
from unittest import mock
def tearDownModule():
asyncio.set_event_loop_policy(None)
class ToThreadTests(unittest.IsolatedAsyncioTestCase):
async def test_to_thread(self):
result = await asyncio.to_thread(sum, [40, 2])
self.assertEqual(result, 42)
async def test_to_thread_exception(self):
def raise_runtime():
raise RuntimeError("test")
with self.assertRaisesRegex(RuntimeError, "test"):
await asyncio.to_thread(raise_runtime)
async def test_to_thread_once(self):
func = mock.Mock()
await asyncio.to_thread(func)
func.assert_called_once()
async def test_to_thread_concurrent(self):
calls = []
def func():
calls.append(1)
futs = []
for _ in range(10):
fut = asyncio.to_thread(func)
futs.append(fut)
await asyncio.gather(*futs)
self.assertEqual(sum(calls), 10)
async def test_to_thread_args_kwargs(self):
# Unlike run_in_executor(), to_thread() should directly accept kwargs.
func = mock.Mock()
await asyncio.to_thread(func, 'test', something=True)
func.assert_called_once_with('test', something=True)
async def test_to_thread_contextvars(self):
test_ctx = ContextVar('test_ctx')
def get_ctx():
return test_ctx.get()
test_ctx.set('parrot')
result = await asyncio.to_thread(get_ctx)
self.assertEqual(result, 'parrot')
if __name__ == "__main__":
unittest.main()
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