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Treating warnings as errors in pytest
Treating warnings as errors in pytest#
I was seeing this warning in a Django project when I thought I was correctly using timezone-aware dates everywhere:
RuntimeWarning: DateTimeField Shift.shift_start received a naive datetime (2022-04-01 00:00:00) while time zone support is active
Running pytest -Werror turns those warnings into errors that fail the tests.
Which means you can investigate them in the Python debugger by running:
1pytest -Werror --pdb -xThe --pdb starts the debugger at the warning (now error) and the -x stops the tests after the first failure.
In pytest.ini#
You can also set this in pytest.ini - useful if you want ALL warnings to be failures in both development and CI.
Add the following to the pytest.ini file:
1[pytest]2# ...3filterwarnings =4 errorIgnoring specific warnings#
If you do this you may find there are warnings you cannot fix (because they are in dependency libraries). You can ignore those like this:
1[pytest]2# ...3filterwarnings =4 error5 ignore::arrow.factory.ArrowParseWarningYou need to figure out the full path to the warning. I used --pdb to figure this out.
Treating warnings as errors in pytest
https://mranv.pages.dev/posts/treating-warnings-as-errors-in-pytest/