Karthikeyan Singaravelan <[email protected]> added the comment:
> BUT I think removing the `if getattr(obj, '__code__', None)` from
> `_is_async_obj` actually makes this work correctly. It is possible for a
> coroutine object to not have a __code__, but I don't think it is possible for
> a coroutine function to be missing a __code__.
Sorry, I am little confused here. If the code attribute check is removed then
my test case in PR fails since obj.__code__ that is passed through
iscoroutinefunction returns True. Maybe something along the lines of below that
if there is a __code__ attribute then always check it's of CodeType. So that my
test passes with MagicMock.__code__ detected.
If I understand the awaitable examples correctly, mocking the obj which is an
Awaitable should be returning an AsyncMock. But obj doesn't contain __code__
and hence check for inspect.isawaitable is never done causing
_is_async_obj(obj) to return False and subsequently it's patched with MagicMock.
from collections.abc import Awaitable
from unittest.mock import patch
class NewCoroutine(Awaitable):
def __await__():
pass
obj = NewCoroutine()
with patch(f"{__name__}.obj") as m:
print(m)
$ ./python.exe ../backups/bpo37251_awaitable.py
<MagicMock name='obj' id='4552158896'>
On removing the __code__ attribute check my test case of MagicMock with
__code__ passes through iscoroutinefunction. Perhaps an acceptable tradeoff
would be to check for __code__ and if present to be a CodeType or else to
resume normal check like below. This way an AsyncMock is returned. Also there
is no test failure. I have less understanding on asyncio terminologies over
coroutine and awaitables so feel free to correct me if I am wrong. I guess it
would be also helpful to have good number of tests for different asyncio object
cases so that this could also be documented.
$ ./python.exe ../backups/bpo37251_awaitable.py
<AsyncMock name='obj' id='4363294672'>
# _is_async_obj to check for __code__ to be CodeType only if present.
def _is_async_obj(obj):
code = getattr(obj, '__code__', None)
if code and not isinstance(code, CodeType):
return False
return asyncio.iscoroutinefunction(obj) or inspect.isawaitable(obj)
# Also verified asyncio.sleep() to return True for _is_async_obj with above
definition
>>> from unittest.mock import _is_async_func, _is_async_obj
>>> import asyncio
>>> _is_async_obj(asyncio.sleep(1))
<stdin>:1: RuntimeWarning: coroutine 'sleep' was never awaited
RuntimeWarning: Enable tracemalloc to get the object allocation traceback
True
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<https://bugs.python.org/issue37251>
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