Django test runner fails trying to report errors from parallel tests

[apotterri]

When running Django tests in parallel, e.g. runtests.py --parallel 4, a failure in one of the tests raises an exeption:

  File "/Users/ajp/src/django/worktrees/django-5.0/.tox/py312/lib/python3.12/site-packages/_appmap/unittest.py", line 72, in callTestMethod
    wrapped(*args, **kwargs)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/unittest/case.py", line 589, in _callTestMethod
    if method() is not None:
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/tests/admin_views/tests.py", line 4663, in test_search_with_spaces
    with self.subTest(search=search):
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/contextlib.py", line 158, in __exit__
    self.gen.throw(value)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/unittest/case.py", line 538, in subTest
    with self._outcome.testPartExecutor(self._subtest, subTest=True):
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/contextlib.py", line 158, in __exit__
    self.gen.throw(value)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/unittest/case.py", line 73, in testPartExecutor
    self.result.addSubTest(test_case.test_case, test_case, exc_info)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/django/test/runner.py", line 305, in addSubTest
    self.check_subtest_picklable(test, subtest)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/django/test/runner.py", line 267, in check_subtest_picklable
    self._confirm_picklable(subtest)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/django/test/runner.py", line 184, in _confirm_picklable
    pickle.loads(pickle.dumps(obj))
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/.tox/py312/lib/python3.12/site-packages/_appmap/wrapt/wrappers.py", line 462, in __reduce_ex__
    raise NotImplementedError(
    ^^^^^^^^^^^^^^^^^
NotImplementedError: object proxy must define __reduce_ex__()

Attempting to resolve this by moving the implementation of __reduce_ex__ up from wrapt.wrappers.FunctionWrapper to wrapt.wrappers.ObjectProxy (where it seems like it belongs) didn't really help:

  File "/Users/ajp/src/applandinc/appmap-python/_appmap/unittest.py", line 72, in callTestMethod
    wrapped(*args, **kwargs)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/unittest/case.py", line 589, in _callTestMethod
    if method() is not None:
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/tests/admin_views/tests.py", line 4663, in test_search_with_spaces
    with self.subTest(search=search):
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/contextlib.py", line 158, in __exit__
    self.gen.throw(value)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/unittest/case.py", line 538, in subTest
    with self._outcome.testPartExecutor(self._subtest, subTest=True):
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/contextlib.py", line 158, in __exit__
    self.gen.throw(value)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/.asdf/installs/python/3.12.2/lib/python3.12/unittest/case.py", line 73, in testPartExecutor
    self.result.addSubTest(test_case.test_case, test_case, exc_info)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/django/test/runner.py", line 305, in addSubTest
    self.check_subtest_picklable(test, subtest)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/django/test/runner.py", line 267, in check_subtest_picklable
    self._confirm_picklable(subtest)
    ^^^^^^^^^^^^^^^^^
  File "/Users/ajp/src/django/worktrees/django-5.0/django/test/runner.py", line 184, in _confirm_picklable
    pickle.loads(pickle.dumps(obj))
    ^^^^^^^^^^^^^^^^^
_pickle.PicklingError: Can't pickle <BoundFunctionWrapper at 0x11850a3c0 for method at 0x116c7a400>: it's not the same object as django.middleware.csrf.CsrfViewMiddleware.process_view

[apotterri]

Fixed by #367