Django test command with --parallel

[Yevhen Yevhen]

I try to run my django tests using --parallel flag but get the following error (pastebin). How can I fix this?

[Yevhen Yevhen]

The same traceback from the pastebin link:

Creating test database for alias 'default'...

Cloning test database for alias 'default'...

Cloning test database for alias 'default'...

System check identified no issues (0 silenced).

Traceback (most recent call last):

  File "manage.py", line 41, in <module>

    main()

  File "manage.py", line 37, in main

    execute_from_command_line(sys.argv)

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/core/management/__init__.py", line 364, in execute_from_command_line

    utility.execute()

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/core/management/__init__.py", line 356, in execute

    self.fetch_command(subcommand).run_from_argv(self.argv)

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/core/management/commands/test.py", line 29, in run_from_argv

    super(Command, self).run_from_argv(argv)

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/core/management/base.py", line 283, in run_from_argv

    self.execute(*args, **cmd_options)

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/core/management/base.py", line 330, in execute

    output = self.handle(*args, **options)

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/core/management/commands/test.py", line 62, in handle

    failures = test_runner.run_tests(test_labels)

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/test/runner.py", line 603, in run_tests

    result = self.run_suite(suite)

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/test/runner.py", line 567, in run_suite

    return runner.run(suite)

  File "/Users/me/.pyenv/versions/3.6.2/lib/python3.6/unittest/runner.py", line 176, in run

    test(result)

  File "/Users/me/.pyenv/versions/3.6.2/lib/python3.6/unittest/suite.py", line 84, in __call__

    return self.run(*args, **kwds)

  File "/Users/me/.virtualenvs/project/lib/python3.6/site-packages/django/test/runner.py", line 370, in run

    subsuite_index, events = test_results.next(timeout=0.1)

  File "/Users/me/.pyenv/versions/3.6.2/lib/python3.6/multiprocessing/pool.py", line 735, in next

    raise value

  File "/Users/me/.pyenv/versions/3.6.2/lib/python3.6/multiprocessing/pool.py", line 424, in _handle_tasks

    put(task)

  File "/Users/me/.pyenv/versions/3.6.2/lib/python3.6/multiprocessing/connection.py", line 206, in send

    self._send_bytes(_ForkingPickler.dumps(obj))

  File "/Users/me/.pyenv/versions/3.6.2/lib/python3.6/multiprocessing/reduction.py", line 51, in dumps

    cls(buf, protocol).dump(obj)

_pickle.PicklingError: Can't pickle <function TestCase.run at 0x1093db730>: it's not the same object as unittest.case.TestCase.run

[Avraham Serour]

does it work without the parallel flag?

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[Yevhen Yevhen]

Yes, it works without this flag. And I've found the cause -- custom mixins for TestCase class that performed tricky patching.

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