python-uvloop/tests/test_dealloc.py at master · sysfce2/python-uvloop · GitHub

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import asyncio

import subprocess

import sys

from uvloop import _testbase as tb

class TestDealloc(tb.UVTestCase):

def test_dealloc_1(self):

# Somewhere between Cython 0.25.2 and 0.26.0 uvloop programs

# started to trigger the following output:

# $ python prog.py

# Error in sys.excepthook:

# Original exception was:

# Upon some debugging, it appeared that Handle.__dealloc__ was

# called at a time where some CPython objects become non-functional,

# and any exception in __dealloc__ caused CPython to output the

# above.

# This regression test starts an event loop in debug mode,

# lets it run for a brief period of time, and exits the program.

# This will trigger Handle.__dealloc__, CallbackHandle.__dealloc__,

# and Loop.__dealloc__ methods. The test will fail if they produce

# any unwanted output.

async def test():

prog = '''\

import uvloop

async def foo():

return 42

def main():

loop = uvloop.new_event_loop()

loop.set_debug(True)

loop.run_until_complete(foo())

# Do not close the loop on purpose: let __dealloc__ methods run.

if __name__ == '__main__':

main()

'''

cmd = sys.executable

proc = await asyncio.create_subprocess_exec(

cmd, b'-W', b'ignore', b'-c', prog,

stdout=subprocess.PIPE,

stderr=subprocess.PIPE)

await proc.wait()

out = await proc.stdout.read()

err = await proc.stderr.read()

return out, err

out, err = self.loop.run_until_complete(test())

self.assertEqual(out, b'', 'stdout is not empty')

self.assertEqual(err, b'', 'stderr is not empty')

python-uvloop/tests/test_dealloc.py at master · sysfce2/python-uvloop · GitHub

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