Give warning when test function return other than None #9956

Cheukting · 2022-05-13T20:51:44Z

Adding a warning in pytest_pyfunc_call after the async_warn_and_skip will check if the return is something other than None.

Closes #7337; see that issue for details.

CC @Zac-HD

Zac-HD

Looks good to me - if you can confirm that this doesn't trigger when used with pytest-twisted, I'll be happy to merge 🥳

src/_pytest/warning_types.py

src/_pytest/python.py

changelog/7337.improvement.rst

Cheukting · 2022-05-13T21:25:02Z

Looks good to me - if you can confirm that this doesn't trigger when used with pytest-twisted, I'll be happy to merge 🥳

I saw there is a test file pytest_twisted_integration.py. Does it test pytest-twisted? Or do I have to create new tests?

Zac-HD · 2022-05-13T21:25:51Z

Looks good to me - if you can confirm that this doesn't trigger when used with pytest-twisted, I'll be happy to merge 🥳

I saw there is a test file pytest_twisted_integration.py. Does it test pytest-twisted? Or do I have to create new tests?

Without looking, I'd have gone and installed pytest-twisted, ran the inlineCallbacks and ensureDeferred examples to check that they work with the main branch and also (without warnings) on this PR. It looks like that test file does pretty much exactly that though, so if it's passing we're all good 💪

Cheukting · 2022-05-13T21:48:48Z

Seems fnmatch_lines works differently in Python3.7 and Python 3.8, This one https://github.com/pytest-dev/pytest/runs/6429987533?check_suite_focus=true#step:5:85 fails at 3.8 but passes at 3.7

Zac-HD

Looks good to me! I'll give others a few days to review, but inclined to merge if I don't hear any objections.

Thanks for the patch, Cheuk 🤩

The-Compiler

Thanks @Cheukting, that seems quite useful! There's a bit of documentation and an addition to the public API missing - after that, this seems good to merge to me!

src/_pytest/python.py

The-Compiler · 2022-05-14T10:47:26Z

src/_pytest/warning_types.py

@@ -55,6 +55,13 @@ class PytestRemovedIn8Warning(PytestDeprecationWarning):
    __module__ = "pytest"


+@final
+class PytestReturnNotNoneWarning(PytestDeprecationWarning):


This should be imported in src/pytest/__init__.py and added to __all__ there, since we want e.g. people to be able to ignore it via their config without having to import private API.

It should also be added to doc/en/reference/reference.rst with the other warnings, and probably get a new entry in doc/en/deprecations.rst.

Thank you for the review, just want to be clear about the deprecations. Since we are already in 7, shall it be deprecated in 8? Or should I say 7?

This should be a warning, not a deprecation warning

Should it, if we plan to turn it into an error in the future?

Deprecation warning is correct if we want to turn it into an error in the future, which seems the plan for unittest in the stdlib too: #7337 (comment).

python/cpython#27748

Co-authored-by: Florian Bruhin <[email protected]>

src/_pytest/python.py

Co-authored-by: Bruno Oliveira <[email protected]>

for more information, see https://pre-commit.ci

changelog/7337.improvement.rst

doc/en/deprecations.rst

for more information, see https://pre-commit.ci

nicoddemus

Thanks a lot @Cheukting for the contribution! 👍

The-Compiler

I'm always a bit confused about how deprecations work in pytest - I feel like we should document this better somewhere... @nicoddemus @bluetech @RonnyPfannschmidt am I correct with my comment? Should PytestReturnNotNoneWarning really be its own class, or should it be an instance of PytestRemovedIn8Warning (or PytestRemovedIn9Warning even?) like some others in src/_pytest/deprecated.py?

Apologies for the delay and somewhat bumpy road @Cheukting!

doc/en/deprecations.rst

RonnyPfannschmidt · 2022-05-20T09:04:55Z

It should be a normal warning

The new class should be a subclass of user warning

RonnyPfannschmidt · 2022-05-20T09:05:35Z

Also, good work, I'd love to get it in

Zac-HD · 2022-05-20T09:28:15Z

It should be a normal warning

The new class should be a subclass of user warning

I disagree; IMO this should be a deprecation warning. I'd like to make it an error in future, and it seems like CPython is also going that way with a deprecation warning in python/cpython#27748 (for 3.11).

RonnyPfannschmidt · 2022-05-20T09:54:27Z

in that case, lets go for Removed in pytest 8

Co-authored-by: Florian Bruhin <[email protected]>

The-Compiler

This seems ready now - @RonnyPfannschmidt @nicoddemus?

graingert · 2022-06-01T16:33:11Z

in that case, lets go for Removed in pytest 8

NotNoneWarning should subclass RemovedIn8Warning https://github.com/pytest-dev/pytest/pull/10012/files#diff-a7738833b05551853edda7933c165b6d7a41d521afb130fdc68631bd9129531eR59

graingert · 2022-06-01T16:36:19Z

in that case, lets go for Removed in pytest 8

It's not possible to subclass RemovedIn8Warning because it's decorated with @final

…0196) As discussed in #9956 (comment). Also added PytestRemovedIn8Warning to the reference docs.

Cheukting added 4 commits May 13, 2022 18:54

Give warning when test function return other than None

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update changelog, warning msg and warning inherit

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Cheukting changed the title ~~[WIP] Give warning when test function return other than None~~ Give warning when test function return other than None May 13, 2022

Cheukting force-pushed the warning_return_non_none branch from b6fdec5 to ffad3f8 Compare May 13, 2022 21:37

update test

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Update src/_pytest/python.py

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Co-authored-by: Florian Bruhin <[email protected]>

import NoReturnWarning

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deprecated reference

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nicoddemus merged commit c988e49 into pytest-dev:main May 25, 2022

graingert mentioned this pull request Jul 29, 2022

Update :class:pytest.PytestUnhandledCoroutineWarning to a deprecation; it will raise an error in pytest 8. [SQUASH] #10012

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graingert mentioned this pull request Oct 9, 2022

PytestReturnNotNoneWarning now subclasses PytestRemovedIn8Warning #10196

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nicoddemus pushed a commit that referenced this pull request Oct 9, 2022

PytestReturnNotNoneWarning now subclasses PytestRemovedIn8Warning (#1…

8a40fc5

…0196) As discussed in #9956 (comment). Also added PytestRemovedIn8Warning to the reference docs.

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Give warning when test function return other than None #9956

Give warning when test function return other than None #9956

Cheukting commented May 13, 2022 •

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Give warning when test function return other than None #9956

Give warning when test function return other than None #9956

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