cancel pytest.main() process from running

[nirperl]

I run this:

def temp()
  result = pytest.main(params, [self.test_plugins])

with future:
self.future = self.executor.submit(temp, details.to_list())

I can't stop the future in middle of test run.
I can cancel the run when using Process, but then I can't use xdist hooks.

Please help

[nicoddemus]

Hi @nirperl,

Unfortunately pytest is not meant to be used with multiprocessing like this.

Can you provide more details about what you are actually trying to accomplish? (In general when asking programming questions, it is useful to explain what you are trying to do in addition to ask for help with a code snippet; often people have different suggestions that can solve the original problem).

[nirperl]

I would like to run pytest tests in a Flask microservice.
I want to a route that will start the test run. Something like:

@env_tests_blueprint.route('/tests/run', methods=['POST', 'GET', 'DELETE']) def tests_run():

I would like to add the option of cancelling/stopping the test run session.
What are the best practices for that?

[nicoddemus]

What are the best practices for that?

Actually that seems pretty novel to me 😆

But if you want to stop the test session mid-run, it is possible. You can set the session.shouldstop attribute to a "reason" string. This will make pytest finish the current test and stop the rest of the suite. You can obtain the session object with the pytest_sessionstart hook (from your example it seems you know your way around plugins and passing them to main).

What's wrong with running pytest in a subprocess and killing it though? Do you need the run to end "cleanly"?

[nirperl]

It seems like I have to use this hook:
def pytest_runtestloop(self, session): if self.stop: session.shouldstop = True
But this hook isn't raised when tests run.
Do you know why?

For you other question, I run it in another subprocess, because otherwise pytest xdist hooks wouldn't be raised.

[nirperl]

I got the session from "sessionstart" hook.
But although I assign session.shouldstop = True,
tests still run

[nicoddemus]

Hmm they should. Can you try this outside the flask service and see how it behaves, preferably posting the output you're seeing and some code?

[nirperl]

It works that way.
but I run the pytest.main with self.future = self.executor.submit
so it can run in the background.
Is there a better way to run pytest.main?

[nicoddemus]

Hmmm submit will need to serialize all arguments, including your list of plugins, that's why your hooks might not fire.

Sorry, I'm not sure how I can help.