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>>> asyncio.iscoroutinefunction(unittest.mock.Mock())
<Mock name='mock._is_coroutine' id='4544068072'>
This is an unexpected response, both in type (Mock rather than boolean) and value (truthy).
inspect.iscoroutinefunction behaves as expected.
Workaround:
>>> m = unittest.mock.Mock()
>>> m._is_coroutine = False
>>> asyncio.iscoroutinefunction(m)
False

Hm... I don't know what answer you would expect. Who says your mock shouldn't behave like a coroutine? In general, passing mocks to functions is likely to return a mock -- even boolean functions.
Can you provide more context?

>>> asyncio.iscoroutinefunction(unittest.mock.Mock())
<Mock name='mock._is_coroutine' id='4544068072'>
Yeah, I already had this issue when I wrote unit tests using mock :-/ I didn't find an obvious fix for this issue, and it's quite easy to workaround it.
It looks like the "m._is_coroutine = False" is not used in asyncio tests. I don't recall how I worked around the issue in asyncio tests...

For me, the context is a test I was writing that went something like this:
>>> import asyncio
>>> from unittest.mock import Mock
>>> loop = asyncio.get_event_loop()
>>> blocking_func = Mock()
>>> loop.run_in_executor(None, blocking_func)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/local/Cellar/python3/3.5.0/Frameworks/Python.framework/Versions/3.5/lib/python3.5/asyncio/base_events.py", line 497, in run_in_executor
 raise TypeError("coroutines cannot be used with run_in_executor()")
TypeError: coroutines cannot be used with run_in_executor()
I understand that the nature of Mock makes its behaviors ambiguous. However, there are a few reasons I think asyncio.iscoroutinefunction(Mock()) should be false:
1) inspect.iscoroutinefunction reports false. asyncio.iscoroutinefunction should be consistent with this.
2) A coroutine function should return a coroutine object. Mock's default behavior won't return a coroutine object, so it shouldn't be identified as a coroutine function by default.
3) It's tidier to make a non-coroutine function Mock into a coroutine function (asyncio.coroutine(Mock())) than it is to make a coroutine function Mock into a non-coroutine function Mock (mock._is_coroutine is implementation-specific hack).

OK, I concede your point. It shouldn't be too hard to make
asyncio.iscoroutinefunction() behave the same way as
inspect.iscoroutinefunction(). Can you submit a patch?

Oh dang. We were waiting for the OP to submit a patch (not very complex)
but they never did. Now we missed the 3.5.2 deadline. Maybe someone can try
again for 3.5.3?
On Tue, Dec 22, 2015 at 12:30 AM, Joseph Gordon <report@bugs.python.org>
wrote:
>
> Changes by Joseph Gordon <j.gordon.matthew@gmail.com>:
>
>
> ----------
> nosy: +josephgordon
>
> _______________________________________
> Python tracker <report@bugs.python.org>
> <http://bugs.python.org/issue25599>
> _______________________________________
>

> Now we missed the 3.5.2 deadline.
Did you mean 3.5.1? Or Larry is going to rush 3.5.2 soon?

No I just misremembered.
--Guido (mobile)

I uploaded a patch that appears to fix the issue.

I guess the inconsistency in original report is fixed with issue28703 where both inspect.iscoroutinefunction and asyncio.iscoroutinefunction return False for Mock(). The fix is available from 3.5.3 . There is also async support for mock added in 3.8 with issue26467. I am closing this as part of triaging. Feel free to reopen this if I am missing something. Thanks.
# Python 3.5
python3.5
Python 3.5.2 (default, Nov 12 2018, 13:43:14)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import asyncio
>>> from unittest.mock import *
>>> asyncio.iscoroutinefunction(Mock())
<Mock name='mock._is_coroutine' id='140563339256496'>
# Master
./python.exe
Python 3.9.0a0 (heads/master:daf6262751, Jun 12 2019, 23:12:37)
[Clang 7.0.2 (clang-700.1.81)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from unittest.mock import Mock
>>> import asyncio, inspect
>>> inspect.iscoroutinefunction(Mock())
False
>>> asyncio.iscoroutinefunction(Mock())
False