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class AppTestAsyncIO(object):
"""These tests are based on the async-await syntax of Python 3.5."""
spaceconfig = dict(usemodules=["select","_socket","thread","signal",
"struct","_multiprocessing","array",
"_posixsubprocess","fcntl",
"unicodedata"])
def test_gil_issue(self):
# the problem occured at await asyncio.open_connection
# after calling run_until_complete
"""
import encodings.idna
import asyncio
async def f():
reader, writer = await asyncio.open_connection('example.com', 80)
writer.close()
loop = asyncio.get_event_loop()
loop.run_until_complete(f())
"""
def test_async_for(self):
# tests if async for receives all stores values in the right order
# and if the correct methods __aiter__ and __anext__ get called
# and if the end results of run_until_complete are None (in a tuple)
"""
import asyncio
class AsyncIter:
def __init__(self):
self._data = list(range(5))
self._index = 0
async def __aiter__(self):
return self
async def __anext__(self):
while self._index < 5:
await asyncio.sleep(1)
self._index += 1
return self._data[self._index-1]
raise StopAsyncIteration
class Corotest(object):
def __init__(self):
self.res = "-"
async def do_loop(self):
async for x in AsyncIter():
self.res += str(x)
self.res += "-"
cor = Corotest()
loop = asyncio.get_event_loop()
futures = [asyncio.ensure_future(cor.do_loop()), asyncio.ensure_future(cor.do_loop())]
taskres = loop.run_until_complete(asyncio.wait(futures))
assert cor.res.count('0') == 2
assert cor.res.count('1') == 2
assert cor.res.count('2') == 2
assert cor.res.count('3') == 2
assert cor.res.count('4') == 2
assert cor.res.find("0") < cor.res.find("1")
assert cor.res.find("1") < cor.res.find("2")
assert cor.res.find("2") < cor.res.find("3")
assert cor.res.find("3") < cor.res.find("4")
assert isinstance(taskres, tuple)
assert len(taskres) == 2
assert "result=None" in repr(taskres[0].pop())
assert "result=None" in repr(taskres[0].pop())
"""
def test_asynchronous_context_managers(self):
# it is important that "releasing lock A" happens before "holding lock B"
# or the other way around, but it is not allowed that both coroutines
# hold the lock at the same time
"""
import encodings.idna
import asyncio
class Corotest(object):
def __init__(self):
self.res = "-"
async def coro(self, name, lock):
self.res += ' coro {}: waiting for lock -'.format(name)
async with lock:
self.res += ' coro {}: holding the lock -'.format(name)
await asyncio.sleep(1)
self.res += ' coro {}: releasing the lock -'.format(name)
cor = Corotest()
loop = asyncio.get_event_loop()
lock = asyncio.Lock()
coros = asyncio.gather(cor.coro(1, lock), cor.coro(2, lock))
try:
loop.run_until_complete(coros)
finally:
loop.close()
assert "coro 1: waiting for lock" in cor.res
assert "coro 1: holding the lock" in cor.res
assert "coro 1: releasing the lock" in cor.res
assert "coro 2: waiting for lock" in cor.res
assert "coro 2: holding the lock" in cor.res
assert "coro 2: releasing the lock" in cor.res
assert cor.res.find("coro 1: releasing the lock") < cor.res.find("coro 2: holding the lock") or \
cor.res.find("coro 2: releasing the lock") < cor.res.find("coro 1: holding the lock")
"""
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