Django Channels tests broken on Windows

[Archmonger]

Old Behavior

======================================================================
ERROR: test_component_from_web_module (test_app.tests.TestIdomCapabilities)
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Traceback (most recent call last):
  File "C:\Users\username\Documents\Repositories\django-idom\.venv\lib\site-packages\django\test\testcases.py", line 272, in _setup_and_call
    self._pre_setup()
  File "C:\Users\username\Documents\Repositories\django-idom\.venv\lib\site-packages\channels\testing\live.py", line 52, in _pre_setup
    self._server_process.start()
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\process.py", line 121, in start
    self._popen = self._Popen(self)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 327, in _Popen
    return Popen(process_obj)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'convert_exception_to_response.<locals>.inner'    

======================================================================
ERROR: test_counter (test_app.tests.TestIdomCapabilities)
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Traceback (most recent call last):
  File "C:\Users\username\Documents\Repositories\django-idom\.venv\lib\site-packages\django\test\testcases.py", line 272, in _setup_and_call
    self._pre_setup()
  File "C:\Users\username\Documents\Repositories\django-idom\.venv\lib\site-packages\channels\testing\live.py", line 52, in _pre_setup
    self._server_process.start()
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\process.py", line 121, in start
    self._popen = self._Popen(self)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 327, in _Popen
    return Popen(process_obj)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'convert_exception_to_response.<locals>.inner'    

======================================================================
ERROR: test_hello_world (test_app.tests.TestIdomCapabilities)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\username\Documents\Repositories\django-idom\.venv\lib\site-packages\django\test\testcases.py", line 272, in _setup_and_call
    self._pre_setup()
  File "C:\Users\username\Documents\Repositories\django-idom\.venv\lib\site-packages\channels\testing\live.py", line 52, in _pre_setup
    self._server_process.start()
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\process.py", line 121, in start
    self._popen = self._Popen(self)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 327, in _Popen
    return Popen(process_obj)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'convert_exception_to_response.<locals>.inner'    

======================================================================
ERROR: test_parametrized_component (test_app.tests.TestIdomCapabilities)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:\Users\username\Documents\Repositories\django-idom\.venv\lib\site-packages\django\test\testcases.py", line 272, in _setup_and_call
    self._pre_setup()
  File "C:\Users\username\Documents\Repositories\django-idom\.venv\lib\site-packages\channels\testing\live.py", line 52, in _pre_setup
    self._server_process.start()
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\process.py", line 121, in start
    self._popen = self._Popen(self)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\context.py", line 327, in _Popen
    return Popen(process_obj)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\popen_spawn_win32.py", line 93, in __init__
    reduction.dump(process_obj, to_child)
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\reduction.py", line 60, in dump
    ForkingPickler(file, protocol).dump(obj)
AttributeError: Can't pickle local object 'convert_exception_to_response.<locals>.inner'    

----------------------------------------------------------------------
Ran 0 tests in 0.027s

FAILED (errors=4)
Destroying test database for alias 'default'...
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 109, in spawn_main
Traceback (most recent call last):
Traceback (most recent call last):
  File "<string>", line 1, in <module>
    fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
  File "<string>", line 1, in <module>
OSError: [Errno 9] Bad file descriptor
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 109, in spawn_main
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 109, in spawn_main
    fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
OSError: [Errno 9] Bad file descriptor
    fd = msvcrt.open_osfhandle(new_handle, os.O_RDONLY)
OSError: [Errno 9] Bad file descriptor
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\spawn.py", line 107, in spawn_main
    new_handle = reduction.duplicate(pipe_handle,
  File "C:\Users\username\AppData\Local\Programs\Python\Python39\lib\multiprocessing\reduction.py", line 79, in duplicate
    return _winapi.DuplicateHandle(
OSError: [WinError 6] The handle is invalid

New Behavior

Tests should properly execute without pickling errors on Windows.

Implementation Details

Should be resolved within django-channels.

Issue is being tracked on django/channels#1207

Tested versions:

Django == 3.2.4 - 3.2.7
Channels == 3.0.0 - 3.0.4
asgiref == 3.3.0 - 3.4.1
idom == any
django-idom == any

Code of Conduct

• I agree to follow the Code of Conduct.