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import asyncio
import sys
import unittest
import nest_asyncio
def exception_handler(loop, context):
print('Exception:', context)
class NestTest(unittest.TestCase):
def setUp(self):
self.loop = asyncio.new_event_loop()
nest_asyncio.apply(self.loop)
asyncio.set_event_loop(self.loop)
self.loop.set_debug(True)
self.loop.set_exception_handler(exception_handler)
def tearDown(self):
self.assertIsNone(asyncio._get_running_loop())
self.loop.close()
del self.loop
async def coro(self):
await asyncio.sleep(0.01)
return 42
def test_nesting(self):
async def f1():
result = self.loop.run_until_complete(self.coro())
self.assertEqual(result, await self.coro())
return result
async def f2():
result = self.loop.run_until_complete(f1())
self.assertEqual(result, await f1())
return result
result = self.loop.run_until_complete(f2())
self.assertEqual(result, 42)
def test_ensure_future_with_run_until_complete(self):
async def f():
task = asyncio.ensure_future(self.coro())
return self.loop.run_until_complete(task)
result = self.loop.run_until_complete(f())
self.assertEqual(result, 42)
def test_ensure_future_with_run_until_complete_with_wait(self):
async def f():
task = asyncio.ensure_future(self.coro())
done, pending = self.loop.run_until_complete(
asyncio.wait([task], return_when=asyncio.ALL_COMPLETED))
task = done.pop()
return task.result()
result = self.loop.run_until_complete(f())
self.assertEqual(result, 42)
def test_timeout(self):
async def f1():
await asyncio.sleep(0.1)
async def f2():
asyncio.run(asyncio.wait_for(f1(), 0.01))
with self.assertRaises(asyncio.TimeoutError):
self.loop.run_until_complete(f2())
def test_two_run_until_completes_in_one_outer_loop(self):
async def f1():
self.loop.run_until_complete(asyncio.sleep(0.02))
return 4
async def f2():
self.loop.run_until_complete(asyncio.sleep(0.01))
return 2
result = self.loop.run_until_complete(
asyncio.gather(f1(), f2()))
self.assertEqual(result, [4, 2])
@unittest.skipIf(sys.version_info < (3, 7, 0), 'No contextvars module')
def test_contextvars(self):
from contextvars import ContextVar
var = ContextVar('var')
var.set(0)
async def set_val():
var.set(42)
async def coro():
await set_val()
await asyncio.sleep(0.01)
return var.get()
result = self.loop.run_until_complete(coro())
self.assertEqual(result, 42)
if __name__ == '__main__':
unittest.main()
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