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GH-100192: add more `asyncio` subprocess tests by kumaraditya303 · Pull Request #100194 · python/cpython · GitHub
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GH-100192: add more asyncio subprocess tests #100194

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Merged
kumaraditya303 merged 5 commits into from
Dec 28, 2022
Merged

GH-100192: add more asyncio subprocess tests #100194

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d9d044b
add tests
kumaraditya303 Dec 12, 2022
1d96bf7
fix tests on windows
kumaraditya303 Dec 12, 2022
d75002c
Merge branch 'main' of https://github.com/python/cpython into subproc…
kumaraditya303 Dec 22, 2022
cb694ed
compare entire list
kumaraditya303 Dec 22, 2022
0a46c45
refactor to helper
kumaraditya303 Dec 22, 2022
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add tests
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@kumaraditya303
kumaraditya303 committed Dec 12, 2022
commit d9d044b2067238e386961d9cc1785a774fc6faa1
81 changes: 81 additions & 0 deletions Lib/test/test_asyncio/test_subprocess.py
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Original file line number Diff line number Diff line change
Expand Up @@ -686,6 +686,87 @@ async def execute():

self.assertIsNone(self.loop.run_until_complete(execute()))

def test_create_subprocess_env_shell(self) -> None:
async def main() -> None:
cmd = f'''{sys.executable} -c "import os; print(os.getenv('FOO'))"'''
env = {"FOO": 'bar'}
proc = await asyncio.create_subprocess_shell(
cmd, env=env, stdout=subprocess.PIPE
)
stdout, _ = await proc.communicate()
self.assertEqual(stdout, b"bar\n")
self.assertEqual(proc.returncode, 0)
task = asyncio.create_task(proc.wait())
await asyncio.sleep(0)
self.assertEqual(task.result(), proc.returncode)

@gvanrossum gvanrossum Dec 21, 2022

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Why not await task instead of sleep(0) and task.result()? At this point we already know the process has exited, since the returncode is 0 on the previous line.

@kumaraditya303 kumaraditya303 Dec 22, 2022

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At this point we already know the process has exited, since the returncode is 0 on the previous line.

Yes, awaiting can take more than one cycle but we are checking that wait will be done immediately so using sleep(0) trick.


self.loop.run_until_complete(main())

def test_create_subprocess_env_exec(self) -> None:
async def main() -> None:
cmd = [sys.executable, "-c",
"import os; print(os.getenv('FOO'))"]
env = {"FOO": 'bar'}
proc = await asyncio.create_subprocess_exec(
*cmd, env=env, stdout=subprocess.PIPE
)
stdout, _ = await proc.communicate()
self.assertEqual(stdout, b"bar\n")
self.assertEqual(proc.returncode, 0)
task = asyncio.create_task(proc.wait())
await asyncio.sleep(0)
self.assertEqual(task.result(), proc.returncode)

self.loop.run_until_complete(main())

def test_subprocess_concurrent_wait(self) -> None:
async def main() -> None:
proc = await asyncio.create_subprocess_exec(
*PROGRAM_CAT,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
)
stdout, _ = await proc.communicate(b'some data')
self.assertEqual(stdout, b"some data")
self.assertEqual(proc.returncode, 0)
self.assertEqual(await asyncio.gather(*[proc.wait() for _ in range(10)]),
[proc.returncode] * 10)

self.loop.run_until_complete(main())

def test_subprocess_consistent_callbacks(self):
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events = []
class Protocol(asyncio.SubprocessProtocol):
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def __init__(self, exit_future: asyncio.Future) -> None:
self.exit_future = exit_future

def pipe_data_received(self, fd, data) -> None:
events.append(('pipe_data_received', fd, data))

def pipe_connection_lost(self, fd, exc) -> None:
events.append('pipe_connection_lost')

def process_exited(self) -> None:
events.append('process_exited')
self.exit_future.set_result(True)

async def main() -> None:
loop = asyncio.get_running_loop()
exit_future = asyncio.Future()
code = 'import sys; sys.stdout.write("stdout"); sys.stderr.write("stderr")'
transport, _ = await loop.subprocess_exec(lambda: Protocol(exit_future), sys.executable, '-c', code,
stdin=None)
await exit_future
transport.close()
self.assertEqual(len(events), 5, events)
self.assertEqual(events[0], ('pipe_data_received', 1, b'stdout'))
self.assertEqual(events[1], ('pipe_data_received', 2, b'stderr'))
self.assertEqual(events[2], 'pipe_connection_lost')
self.assertEqual(events[3], 'pipe_connection_lost')
self.assertEqual(events[4], 'process_exited')
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self.loop.run_until_complete(main())


if sys.platform != 'win32':
# Unix
Expand Down