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3401 lines (2676 loc) · 107 KB
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"""Tests for tasks.py."""
import collections
import contextlib
import contextvars
import functools
import gc
import io
import random
import re
import sys
import textwrap
import traceback
import types
import unittest
import weakref
from unittest import mock
import asyncio
from asyncio import coroutines
from asyncio import futures
from asyncio import tasks
from test.test_asyncio import utils as test_utils
from test import support
from test.support.script_helper import assert_python_ok
def tearDownModule():
asyncio.set_event_loop_policy(None)
async def coroutine_function():
pass
def format_coroutine(qualname, state, src, source_traceback, generator=False):
if generator:
state = '%s' % state
else:
state = '%s, defined' % state
if source_traceback is not None:
frame = source_traceback[-1]
return ('coro=<%s() %s at %s> created at %s:%s'
% (qualname, state, src, frame[0], frame[1]))
else:
return 'coro=<%s() %s at %s>' % (qualname, state, src)
def get_innermost_context(exc):
"""
Return information about the innermost exception context in the chain.
"""
depth = 0
while True:
context = exc.__context__
if context is None:
break
exc = context
depth += 1
return (type(exc), exc.args, depth)
class Dummy:
def __repr__(self):
return '<Dummy>'
def __call__(self, *args):
pass
class CoroLikeObject:
def send(self, v):
raise StopIteration(42)
def throw(self, *exc):
pass
def close(self):
pass
def __await__(self):
return self
# The following value can be used as a very small timeout:
# it passes check "timeout > 0", but has almost
# no effect on the test performance
_EPSILON = 0.0001
class BaseTaskTests:
Task = None
Future = None
def new_task(self, loop, coro, name='TestTask'):
return self.__class__.Task(coro, loop=loop, name=name)
def new_future(self, loop):
return self.__class__.Future(loop=loop)
def setUp(self):
super().setUp()
self.loop = self.new_test_loop()
self.loop.set_task_factory(self.new_task)
self.loop.create_future = lambda: self.new_future(self.loop)
def test_task_cancel_message_getter(self):
async def coro():
pass
t = self.new_task(self.loop, coro())
self.assertTrue(hasattr(t, '_cancel_message'))
self.assertEqual(t._cancel_message, None)
t.cancel('my message')
self.assertEqual(t._cancel_message, 'my message')
with self.assertRaises(asyncio.CancelledError):
self.loop.run_until_complete(t)
def test_task_cancel_message_setter(self):
async def coro():
pass
t = self.new_task(self.loop, coro())
t.cancel('my message')
t._cancel_message = 'my new message'
self.assertEqual(t._cancel_message, 'my new message')
with self.assertRaises(asyncio.CancelledError):
self.loop.run_until_complete(t)
def test_task_del_collect(self):
class Evil:
def __del__(self):
gc.collect()
async def run():
return Evil()
self.loop.run_until_complete(
asyncio.gather(*[
self.new_task(self.loop, run()) for _ in range(100)
]))
def test_other_loop_future(self):
other_loop = asyncio.new_event_loop()
fut = self.new_future(other_loop)
async def run(fut):
await fut
try:
with self.assertRaisesRegex(RuntimeError,
r'Task .* got Future .* attached'):
self.loop.run_until_complete(run(fut))
finally:
other_loop.close()
def test_task_awaits_on_itself(self):
async def test():
await task
task = asyncio.ensure_future(test(), loop=self.loop)
with self.assertRaisesRegex(RuntimeError,
'Task cannot await on itself'):
self.loop.run_until_complete(task)
def test_task_class(self):
async def notmuch():
return 'ok'
t = self.new_task(self.loop, notmuch())
self.loop.run_until_complete(t)
self.assertTrue(t.done())
self.assertEqual(t.result(), 'ok')
self.assertIs(t._loop, self.loop)
self.assertIs(t.get_loop(), self.loop)
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
t = self.new_task(loop, notmuch())
self.assertIs(t._loop, loop)
loop.run_until_complete(t)
loop.close()
def test_ensure_future_coroutine(self):
async def notmuch():
return 'ok'
t = asyncio.ensure_future(notmuch(), loop=self.loop)
self.assertIs(t._loop, self.loop)
self.loop.run_until_complete(t)
self.assertTrue(t.done())
self.assertEqual(t.result(), 'ok')
a = notmuch()
self.addCleanup(a.close)
with self.assertWarns(DeprecationWarning) as cm:
with self.assertRaisesRegex(RuntimeError, 'There is no current event loop'):
asyncio.ensure_future(a)
self.assertEqual(cm.warnings[0].filename, __file__)
async def test():
return asyncio.ensure_future(notmuch())
t = self.loop.run_until_complete(test())
self.assertIs(t._loop, self.loop)
self.loop.run_until_complete(t)
self.assertTrue(t.done())
self.assertEqual(t.result(), 'ok')
# Deprecated in 3.10
asyncio.set_event_loop(self.loop)
self.addCleanup(asyncio.set_event_loop, None)
with self.assertWarns(DeprecationWarning) as cm:
t = asyncio.ensure_future(notmuch())
self.assertEqual(cm.warnings[0].filename, __file__)
self.assertIs(t._loop, self.loop)
self.loop.run_until_complete(t)
self.assertTrue(t.done())
self.assertEqual(t.result(), 'ok')
def test_ensure_future_future(self):
f_orig = self.new_future(self.loop)
f_orig.set_result('ko')
f = asyncio.ensure_future(f_orig)
self.loop.run_until_complete(f)
self.assertTrue(f.done())
self.assertEqual(f.result(), 'ko')
self.assertIs(f, f_orig)
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
with self.assertRaises(ValueError):
f = asyncio.ensure_future(f_orig, loop=loop)
loop.close()
f = asyncio.ensure_future(f_orig, loop=self.loop)
self.assertIs(f, f_orig)
def test_ensure_future_task(self):
async def notmuch():
return 'ok'
t_orig = self.new_task(self.loop, notmuch())
t = asyncio.ensure_future(t_orig)
self.loop.run_until_complete(t)
self.assertTrue(t.done())
self.assertEqual(t.result(), 'ok')
self.assertIs(t, t_orig)
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
with self.assertRaises(ValueError):
t = asyncio.ensure_future(t_orig, loop=loop)
loop.close()
t = asyncio.ensure_future(t_orig, loop=self.loop)
self.assertIs(t, t_orig)
def test_ensure_future_awaitable(self):
class Aw:
def __init__(self, coro):
self.coro = coro
def __await__(self):
return self.coro.__await__()
async def coro():
return 'ok'
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
fut = asyncio.ensure_future(Aw(coro()), loop=loop)
loop.run_until_complete(fut)
assert fut.result() == 'ok'
def test_ensure_future_neither(self):
with self.assertRaises(TypeError):
asyncio.ensure_future('ok')
def test_ensure_future_error_msg(self):
loop = asyncio.new_event_loop()
f = self.new_future(self.loop)
with self.assertRaisesRegex(ValueError, 'The future belongs to a '
'different loop than the one specified as '
'the loop argument'):
asyncio.ensure_future(f, loop=loop)
loop.close()
def test_get_stack(self):
T = None
async def foo():
await bar()
async def bar():
# test get_stack()
f = T.get_stack(limit=1)
try:
self.assertEqual(f[0].f_code.co_name, 'foo')
finally:
f = None
# test print_stack()
file = io.StringIO()
T.print_stack(limit=1, file=file)
file.seek(0)
tb = file.read()
self.assertRegex(tb, r'foo\(\) running')
async def runner():
nonlocal T
T = asyncio.ensure_future(foo(), loop=self.loop)
await T
self.loop.run_until_complete(runner())
def test_task_repr(self):
self.loop.set_debug(False)
async def notmuch():
return 'abc'
# test coroutine function
self.assertEqual(notmuch.__name__, 'notmuch')
self.assertRegex(notmuch.__qualname__,
r'\w+.test_task_repr.<locals>.notmuch')
self.assertEqual(notmuch.__module__, __name__)
filename, lineno = test_utils.get_function_source(notmuch)
src = "%s:%s" % (filename, lineno)
# test coroutine object
gen = notmuch()
coro_qualname = 'BaseTaskTests.test_task_repr.<locals>.notmuch'
self.assertEqual(gen.__name__, 'notmuch')
self.assertEqual(gen.__qualname__, coro_qualname)
# test pending Task
t = self.new_task(self.loop, gen)
t.add_done_callback(Dummy())
coro = format_coroutine(coro_qualname, 'running', src,
t._source_traceback, generator=True)
self.assertEqual(repr(t),
"<Task pending name='TestTask' %s cb=[<Dummy>()]>" % coro)
# test cancelling Task
t.cancel() # Does not take immediate effect!
self.assertEqual(repr(t),
"<Task cancelling name='TestTask' %s cb=[<Dummy>()]>" % coro)
# test cancelled Task
self.assertRaises(asyncio.CancelledError,
self.loop.run_until_complete, t)
coro = format_coroutine(coro_qualname, 'done', src,
t._source_traceback)
self.assertEqual(repr(t),
"<Task cancelled name='TestTask' %s>" % coro)
# test finished Task
t = self.new_task(self.loop, notmuch())
self.loop.run_until_complete(t)
coro = format_coroutine(coro_qualname, 'done', src,
t._source_traceback)
self.assertEqual(repr(t),
"<Task finished name='TestTask' %s result='abc'>" % coro)
def test_task_repr_autogenerated(self):
async def notmuch():
return 123
t1 = self.new_task(self.loop, notmuch(), None)
t2 = self.new_task(self.loop, notmuch(), None)
self.assertNotEqual(repr(t1), repr(t2))
match1 = re.match(r"^<Task pending name='Task-(\d+)'", repr(t1))
self.assertIsNotNone(match1)
match2 = re.match(r"^<Task pending name='Task-(\d+)'", repr(t2))
self.assertIsNotNone(match2)
# Autogenerated task names should have monotonically increasing numbers
self.assertLess(int(match1.group(1)), int(match2.group(1)))
self.loop.run_until_complete(t1)
self.loop.run_until_complete(t2)
def test_task_repr_name_not_str(self):
async def notmuch():
return 123
t = self.new_task(self.loop, notmuch())
t.set_name({6})
self.assertEqual(t.get_name(), '{6}')
self.loop.run_until_complete(t)
def test_task_repr_wait_for(self):
self.loop.set_debug(False)
async def wait_for(fut):
return await fut
fut = self.new_future(self.loop)
task = self.new_task(self.loop, wait_for(fut))
test_utils.run_briefly(self.loop)
self.assertRegex(repr(task),
'<Task .* wait_for=%s>' % re.escape(repr(fut)))
fut.set_result(None)
self.loop.run_until_complete(task)
def test_task_basics(self):
async def outer():
a = await inner1()
b = await inner2()
return a+b
async def inner1():
return 42
async def inner2():
return 1000
t = outer()
self.assertEqual(self.loop.run_until_complete(t), 1042)
def test_exception_chaining_after_await(self):
# Test that when awaiting on a task when an exception is already
# active, if the task raises an exception it will be chained
# with the original.
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def raise_error():
raise ValueError
async def run():
try:
raise KeyError(3)
except Exception as exc:
task = self.new_task(loop, raise_error())
try:
await task
except Exception as exc:
self.assertEqual(type(exc), ValueError)
chained = exc.__context__
self.assertEqual((type(chained), chained.args),
(KeyError, (3,)))
try:
task = self.new_task(loop, run())
loop.run_until_complete(task)
finally:
loop.close()
def test_exception_chaining_after_await_with_context_cycle(self):
# Check trying to create an exception context cycle:
# https://bugs.python.org/issue40696
has_cycle = None
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def process_exc(exc):
raise exc
async def run():
nonlocal has_cycle
try:
raise KeyError('a')
except Exception as exc:
task = self.new_task(loop, process_exc(exc))
try:
await task
except BaseException as exc:
has_cycle = (exc is exc.__context__)
# Prevent a hang if has_cycle is True.
exc.__context__ = None
try:
task = self.new_task(loop, run())
loop.run_until_complete(task)
finally:
loop.close()
# This also distinguishes from the initial has_cycle=None.
self.assertEqual(has_cycle, False)
def test_cancel(self):
def gen():
when = yield
self.assertAlmostEqual(10.0, when)
yield 0
loop = self.new_test_loop(gen)
async def task():
await asyncio.sleep(10.0)
return 12
t = self.new_task(loop, task())
loop.call_soon(t.cancel)
with self.assertRaises(asyncio.CancelledError):
loop.run_until_complete(t)
self.assertTrue(t.done())
self.assertTrue(t.cancelled())
self.assertFalse(t.cancel())
def test_cancel_with_message_then_future_result(self):
# Test Future.result() after calling cancel() with a message.
cases = [
((), ()),
((None,), ()),
(('my message',), ('my message',)),
# Non-string values should roundtrip.
((5,), (5,)),
]
for cancel_args, expected_args in cases:
with self.subTest(cancel_args=cancel_args):
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def sleep():
await asyncio.sleep(10)
async def coro():
task = self.new_task(loop, sleep())
await asyncio.sleep(0)
task.cancel(*cancel_args)
done, pending = await asyncio.wait([task])
task.result()
task = self.new_task(loop, coro())
with self.assertRaises(asyncio.CancelledError) as cm:
loop.run_until_complete(task)
exc = cm.exception
self.assertEqual(exc.args, ())
actual = get_innermost_context(exc)
self.assertEqual(actual,
(asyncio.CancelledError, expected_args, 2))
def test_cancel_with_message_then_future_exception(self):
# Test Future.exception() after calling cancel() with a message.
cases = [
((), ()),
((None,), ()),
(('my message',), ('my message',)),
# Non-string values should roundtrip.
((5,), (5,)),
]
for cancel_args, expected_args in cases:
with self.subTest(cancel_args=cancel_args):
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def sleep():
await asyncio.sleep(10)
async def coro():
task = self.new_task(loop, sleep())
await asyncio.sleep(0)
task.cancel(*cancel_args)
done, pending = await asyncio.wait([task])
task.exception()
task = self.new_task(loop, coro())
with self.assertRaises(asyncio.CancelledError) as cm:
loop.run_until_complete(task)
exc = cm.exception
self.assertEqual(exc.args, ())
actual = get_innermost_context(exc)
self.assertEqual(actual,
(asyncio.CancelledError, expected_args, 2))
def test_cancel_with_message_before_starting_task(self):
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def sleep():
await asyncio.sleep(10)
async def coro():
task = self.new_task(loop, sleep())
# We deliberately leave out the sleep here.
task.cancel('my message')
done, pending = await asyncio.wait([task])
task.exception()
task = self.new_task(loop, coro())
with self.assertRaises(asyncio.CancelledError) as cm:
loop.run_until_complete(task)
exc = cm.exception
self.assertEqual(exc.args, ())
actual = get_innermost_context(exc)
self.assertEqual(actual,
(asyncio.CancelledError, ('my message',), 2))
def test_cancel_yield(self):
async def task():
await asyncio.sleep(0)
await asyncio.sleep(0)
return 12
t = self.new_task(self.loop, task())
test_utils.run_briefly(self.loop) # start coro
t.cancel()
self.assertRaises(
asyncio.CancelledError, self.loop.run_until_complete, t)
self.assertTrue(t.done())
self.assertTrue(t.cancelled())
self.assertFalse(t.cancel())
def test_cancel_inner_future(self):
f = self.new_future(self.loop)
async def task():
await f
return 12
t = self.new_task(self.loop, task())
test_utils.run_briefly(self.loop) # start task
f.cancel()
with self.assertRaises(asyncio.CancelledError):
self.loop.run_until_complete(t)
self.assertTrue(f.cancelled())
self.assertTrue(t.cancelled())
def test_cancel_both_task_and_inner_future(self):
f = self.new_future(self.loop)
async def task():
await f
return 12
t = self.new_task(self.loop, task())
test_utils.run_briefly(self.loop)
f.cancel()
t.cancel()
with self.assertRaises(asyncio.CancelledError):
self.loop.run_until_complete(t)
self.assertTrue(t.done())
self.assertTrue(f.cancelled())
self.assertTrue(t.cancelled())
def test_cancel_task_catching(self):
fut1 = self.new_future(self.loop)
fut2 = self.new_future(self.loop)
async def task():
await fut1
try:
await fut2
except asyncio.CancelledError:
return 42
t = self.new_task(self.loop, task())
test_utils.run_briefly(self.loop)
self.assertIs(t._fut_waiter, fut1) # White-box test.
fut1.set_result(None)
test_utils.run_briefly(self.loop)
self.assertIs(t._fut_waiter, fut2) # White-box test.
t.cancel()
self.assertTrue(fut2.cancelled())
res = self.loop.run_until_complete(t)
self.assertEqual(res, 42)
self.assertFalse(t.cancelled())
def test_cancel_task_ignoring(self):
fut1 = self.new_future(self.loop)
fut2 = self.new_future(self.loop)
fut3 = self.new_future(self.loop)
async def task():
await fut1
try:
await fut2
except asyncio.CancelledError:
pass
res = await fut3
return res
t = self.new_task(self.loop, task())
test_utils.run_briefly(self.loop)
self.assertIs(t._fut_waiter, fut1) # White-box test.
fut1.set_result(None)
test_utils.run_briefly(self.loop)
self.assertIs(t._fut_waiter, fut2) # White-box test.
t.cancel()
self.assertTrue(fut2.cancelled())
test_utils.run_briefly(self.loop)
self.assertIs(t._fut_waiter, fut3) # White-box test.
fut3.set_result(42)
res = self.loop.run_until_complete(t)
self.assertEqual(res, 42)
self.assertFalse(fut3.cancelled())
self.assertFalse(t.cancelled())
def test_cancel_current_task(self):
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def task():
t.cancel()
self.assertTrue(t._must_cancel) # White-box test.
# The sleep should be cancelled immediately.
await asyncio.sleep(100)
return 12
t = self.new_task(loop, task())
self.assertFalse(t.cancelled())
self.assertRaises(
asyncio.CancelledError, loop.run_until_complete, t)
self.assertTrue(t.done())
self.assertTrue(t.cancelled())
self.assertFalse(t._must_cancel) # White-box test.
self.assertFalse(t.cancel())
def test_cancel_at_end(self):
"""coroutine end right after task is cancelled"""
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def task():
t.cancel()
self.assertTrue(t._must_cancel) # White-box test.
return 12
t = self.new_task(loop, task())
self.assertFalse(t.cancelled())
self.assertRaises(
asyncio.CancelledError, loop.run_until_complete, t)
self.assertTrue(t.done())
self.assertTrue(t.cancelled())
self.assertFalse(t._must_cancel) # White-box test.
self.assertFalse(t.cancel())
def test_cancel_awaited_task(self):
# This tests for a relatively rare condition when
# a task cancellation is requested for a task which is not
# currently blocked, such as a task cancelling itself.
# In this situation we must ensure that whatever next future
# or task the cancelled task blocks on is cancelled correctly
# as well. See also bpo-34872.
loop = asyncio.new_event_loop()
self.addCleanup(lambda: loop.close())
task = nested_task = None
fut = self.new_future(loop)
async def nested():
await fut
async def coro():
nonlocal nested_task
# Create a sub-task and wait for it to run.
nested_task = self.new_task(loop, nested())
await asyncio.sleep(0)
# Request the current task to be cancelled.
task.cancel()
# Block on the nested task, which should be immediately
# cancelled.
await nested_task
task = self.new_task(loop, coro())
with self.assertRaises(asyncio.CancelledError):
loop.run_until_complete(task)
self.assertTrue(task.cancelled())
self.assertTrue(nested_task.cancelled())
self.assertTrue(fut.cancelled())
def assert_text_contains(self, text, substr):
if substr not in text:
raise RuntimeError(f'text {substr!r} not found in:\n>>>{text}<<<')
def test_cancel_traceback_for_future_result(self):
# When calling Future.result() on a cancelled task, check that the
# line of code that was interrupted is included in the traceback.
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def nested():
# This will get cancelled immediately.
await asyncio.sleep(10)
async def coro():
task = self.new_task(loop, nested())
await asyncio.sleep(0)
task.cancel()
await task # search target
task = self.new_task(loop, coro())
try:
loop.run_until_complete(task)
except asyncio.CancelledError:
tb = traceback.format_exc()
self.assert_text_contains(tb, "await asyncio.sleep(10)")
# The intermediate await should also be included.
self.assert_text_contains(tb, "await task # search target")
else:
self.fail('CancelledError did not occur')
def test_cancel_traceback_for_future_exception(self):
# When calling Future.exception() on a cancelled task, check that the
# line of code that was interrupted is included in the traceback.
loop = asyncio.new_event_loop()
self.set_event_loop(loop)
async def nested():
# This will get cancelled immediately.
await asyncio.sleep(10)
async def coro():
task = self.new_task(loop, nested())
await asyncio.sleep(0)
task.cancel()
done, pending = await asyncio.wait([task])
task.exception() # search target
task = self.new_task(loop, coro())
try:
loop.run_until_complete(task)
except asyncio.CancelledError:
tb = traceback.format_exc()
self.assert_text_contains(tb, "await asyncio.sleep(10)")
# The intermediate await should also be included.
self.assert_text_contains(tb,
"task.exception() # search target")
else:
self.fail('CancelledError did not occur')
def test_stop_while_run_in_complete(self):
def gen():
when = yield
self.assertAlmostEqual(0.1, when)
when = yield 0.1
self.assertAlmostEqual(0.2, when)
when = yield 0.1
self.assertAlmostEqual(0.3, when)
yield 0.1
loop = self.new_test_loop(gen)
x = 0
async def task():
nonlocal x
while x < 10:
await asyncio.sleep(0.1)
x += 1
if x == 2:
loop.stop()
t = self.new_task(loop, task())
with self.assertRaises(RuntimeError) as cm:
loop.run_until_complete(t)
self.assertEqual(str(cm.exception),
'Event loop stopped before Future completed.')
self.assertFalse(t.done())
self.assertEqual(x, 2)
self.assertAlmostEqual(0.3, loop.time())
t.cancel()
self.assertRaises(asyncio.CancelledError, loop.run_until_complete, t)
def test_log_traceback(self):
async def coro():
pass
task = self.new_task(self.loop, coro())
with self.assertRaisesRegex(ValueError, 'can only be set to False'):
task._log_traceback = True
self.loop.run_until_complete(task)
def test_wait_for_timeout_less_then_0_or_0_future_done(self):
def gen():
when = yield
self.assertAlmostEqual(0, when)
loop = self.new_test_loop(gen)
fut = self.new_future(loop)
fut.set_result('done')
ret = loop.run_until_complete(asyncio.wait_for(fut, 0))
self.assertEqual(ret, 'done')
self.assertTrue(fut.done())
self.assertAlmostEqual(0, loop.time())
def test_wait_for_timeout_less_then_0_or_0_coroutine_do_not_started(self):
def gen():
when = yield
self.assertAlmostEqual(0, when)
loop = self.new_test_loop(gen)
foo_started = False
async def foo():
nonlocal foo_started
foo_started = True
with self.assertRaises(asyncio.TimeoutError):
loop.run_until_complete(asyncio.wait_for(foo(), 0))
self.assertAlmostEqual(0, loop.time())
self.assertEqual(foo_started, False)
def test_wait_for_timeout_less_then_0_or_0(self):
def gen():
when = yield
self.assertAlmostEqual(0.2, when)
when = yield 0
self.assertAlmostEqual(0, when)
for timeout in [0, -1]:
with self.subTest(timeout=timeout):
loop = self.new_test_loop(gen)
foo_running = None
async def foo():
nonlocal foo_running
foo_running = True
try:
await asyncio.sleep(0.2)
finally:
foo_running = False
return 'done'
fut = self.new_task(loop, foo())
with self.assertRaises(asyncio.TimeoutError):
loop.run_until_complete(asyncio.wait_for(fut, timeout))
self.assertTrue(fut.done())
# it should have been cancelled due to the timeout
self.assertTrue(fut.cancelled())
self.assertAlmostEqual(0, loop.time())
self.assertEqual(foo_running, False)
def test_wait_for(self):
def gen():
when = yield
self.assertAlmostEqual(0.2, when)
when = yield 0
self.assertAlmostEqual(0.1, when)
when = yield 0.1
loop = self.new_test_loop(gen)
foo_running = None
async def foo():
nonlocal foo_running
foo_running = True
try:
await asyncio.sleep(0.2)
finally:
foo_running = False
return 'done'
fut = self.new_task(loop, foo())
with self.assertRaises(asyncio.TimeoutError):
loop.run_until_complete(asyncio.wait_for(fut, 0.1))
self.assertTrue(fut.done())
# it should have been cancelled due to the timeout
self.assertTrue(fut.cancelled())
self.assertAlmostEqual(0.1, loop.time())
self.assertEqual(foo_running, False)
def test_wait_for_blocking(self):
loop = self.new_test_loop()
async def coro():
return 'done'
res = loop.run_until_complete(asyncio.wait_for(coro(), timeout=None))
self.assertEqual(res, 'done')
def test_wait_for_race_condition(self):
def gen():
yield 0.1
yield 0.1