`monkeytype run manage.py test` doesn't produce sqllite file about monkeytype HOT 10 CLOSED

Sorry, to add more detail I'm running this on: Django==1.11.7 and MonkeyType==17.12.2.

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The test runner could affect this; for example, when using --parallel with the default test runner, and parallel test execution is enabled by default in Django 1.11:

--parallel [N]

Runs tests in separate parallel processes. Since modern processors have multiple cores, this allows running tests significantly faster.

By default --parallel runs one process per core according to multiprocessing.cpu_count(). You can adjust the number of processes either by providing it as the option’s value, e.g. --parallel=4, or by setting the DJANGO_TEST_PROCESSES > environment variable.

If my theory is correct, then MonkeyType whould be tracing just the main test supervisor process, which is (I guess) Django-only code.

@nsillik Can you try running the tests with just one process?

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@carljm I came back to say just that, a note about this "gotcha" would be really appreciated by newcomers, specially because Django has this behavior enabled by default, and most likely people will try out this tool by running unit tests in a local development environment.

BTW, thanks for opensourcing this!

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FAQ entry added: http://monkeytype.readthedocs.io/en/latest/faq.html

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Do you get an error or any output at all from monkeytype run?

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Closing for now since there's not enough information here to do any debugging; will reopen if we get full paste of shell session, with all output.

Most likely issue is that you are hitting #28.

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Other than some warnings generated by my tests, there's no output that seems like it's from monkeytype:

» monkeytype run manage.py test
Creating test database for alias 'default'...
System check identified some issues:

WARNINGS:
?: (django_mysql.W003) The character set is not utf8mb4 for database connection 'default'
	HINT: The default 'utf8' character set does not include support for all Unicode characters. It's strongly recommended you move to use 'utf8mb4'. See: https://django-mysql.readthedocs.io/en/latest/checks.html#django-mysql-w003-utf8mb4

System check identified 1 issue (0 silenced).
............/Users/nsillik/Development/mado/mado-api/mado_api/util/paginator.py:9: UnorderedObjectListWarning: Pagination may yield inconsistent results with an unordered object_list: <class 'mado_api.device.models.DeviceConnection'> QuerySet.
  paginator = Paginator(qs, numResults)
..................................................................
----------------------------------------------------------------------
Ran 78 tests in 10.033s

OK
Destroying test database for alias 'default'...

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That's odd. Do you have a monkeytype_config.py? Or have you set the MT_DB_PATH environment variable?

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@mandx monkeytype run ./manage.py test --parallel 1 generated a sqllite file!

I'm still not able to generate stubs, but I think that's a separate issue.

@carljm I do not have a monkeytype_config.py or MT_DB_PATH variable set.

I'm going to close this while I see what the issue with stub generation is. Thanks for your help!

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Thanks for identifying the problem, @mandx ! I'll add an entry about this issue to the FAQ.

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