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I've read the various questions about pytest-catchlog etc but I'm none the wiser - how exactly does Pytest do logging?

I have a top-level Python app that creates a log file. There are a number of modules used by the app and their logging also ends up in the log file. But I want to unit test these modules and when I write a Pytest unit test and run it, there is no logging anywhere from the modules.

I've seen talk about 'pytest-catchlog' but it talks about stdout and the like and I don't even see my logs appearing on screen. So how is Pytest generating (or not) logs and how can I tap in and get the log file that I want?

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    have you tried the options -vv and -s to increase the verbosity and capture logs. pytest-capture Commented May 31, 2017 at 9:39
  • Thanks - what has been confusing me was that '-s' is about stdout and I've only ever seen logging to files. However having now figured out that logging can also be a glorified print(), I've managed to see what is happening. It seems that whoever wrote the product that I've inherited wrote their own logging code in a very odd manner and apparently that's been totally sabotaging my attempts to use logging. So a combination of improving this strange code and your -s/-vv suggestions is starting to yield results. Thanks. Commented Jun 2, 2017 at 9:54
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