CI Tests Failure with Release of Python 3.12.0-alpha.7

[rmartin16]

Describe the bug

CI test failure showed up today; wasn't happening on Python 3.12.0-alpha.6

==============================================================================
ERROR: tests/integrations/download/test_Download__file.py::test_content_connection_error
------------------------------------------------------------------------------
Downloading something.zip...

Traceback (most recent call last):
  File "D:\a\briefcase\briefcase\tests\integrations\download\test_Download__file.py", line 363, in test_content_connection_error
    mock_tools.download.file(
  File "D:\a\briefcase\briefcase\.tox\py\Lib\site-packages\briefcase\integrations\download.py", line 85, in file
    self._fetch_and_write_content(response, filename)
  File "D:\a\briefcase\briefcase\.tox\py\Lib\site-packages\briefcase\integrations\download.py", line 116, in _fetch_and_write_content
    temp_file.write(response.content)
  File "C:\hostedtoolcache\windows\Python\3.12.0-alpha.7\x64\Lib\tempfile.py", line 483, in func_wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
TypeError: a bytes-like object is required, not 'MagicMock'

Steps to reproduce

CI

Expected behavior

CI passes.

Screenshots

No response

Environment

• Operating System: Windows, macOS, Ubuntu
• Python version: 3.12.0-alpha.7
• Software versions:
  • Briefcase: 0.3.14.dev78+g3f8b8979

Logs

No response

Additional context

No response

[rmartin16]

well...I don't know what's causing this....maybe a bug in this alpha

fwiw, using a debug version of Python 3.12.0a7, I get a hard crash:

❯ pytest tests/integrations/download/ -k test_content_connection_error
Fatal Python error: Aborted

Current thread 0x00007f94a529fb80 (most recent call first):
  File "/home/russell/.pyenv/versions/3.12.0a7-debug/lib/python3.12/unittest/mock.py", line 647 in __getattr__
  File "/home/russell/github/beeware/briefcase/src/briefcase/integrations/download.py", line 116 in _fetch_and_write_content
  File "/home/russell/github/beeware/briefcase/src/briefcase/integrations/download.py", line 85 in file
  File "/home/russell/github/beeware/briefcase/tests/integrations/download/test_Download__file.py", line 361 in test_content_connection_error
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/python.py", line 195 in pytest_pyfunc_call
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_callers.py", line 39 in _multicall
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_manager.py", line 80 in _hookexec
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_hooks.py", line 265 in __call__
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/python.py", line 1789 in runtest
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/runner.py", line 167 in pytest_runtest_call
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_callers.py", line 39 in _multicall
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_manager.py", line 80 in _hookexec
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_hooks.py", line 265 in __call__
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/runner.py", line 260 in <lambda>
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/runner.py", line 339 in from_call
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/runner.py", line 259 in call_runtest_hook
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/runner.py", line 220 in call_and_report
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/runner.py", line 131 in runtestprotocol
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/runner.py", line 112 in pytest_runtest_protocol
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_callers.py", line 39 in _multicall
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_manager.py", line 80 in _hookexec
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_hooks.py", line 265 in __call__
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/main.py", line 349 in pytest_runtestloop
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_callers.py", line 39 in _multicall
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_manager.py", line 80 in _hookexec
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_hooks.py", line 265 in __call__
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/main.py", line 324 in _main
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/main.py", line 270 in wrap_session
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/main.py", line 317 in pytest_cmdline_main
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_callers.py", line 39 in _multicall
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_manager.py", line 80 in _hookexec
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/pluggy/_hooks.py", line 265 in __call__
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/config/__init__.py", line 167 in main
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/lib/python3.12/site-packages/_pytest/config/__init__.py", line 190 in console_main
  File "/home/russell/github/beeware/briefcase/venv-3.12.0a7-briefcase/bin/pytest", line 8 in <module>

Extension modules: markupsafe._speedups, psutil._psutil_linux, psutil._psutil_posix (total: 3)
Aborted (core dumped)

[freakboy3742]

Looks like a regression in unitest.mock.PropertyMock.

[freakboy3742]

This has been fixed in CPython main in python/cpython#103332; a regression test has been submitted in python/cpython#103358. Unfortunately, we won't see the benefit of this until a new release is cut, which won't be until early May with the release of 3.12.0b1.

[rmartin16]

Python 3.12.0b1 included the fix for this issue. Further work for Python 3.12 support is being tracked in #1290.