Add a cibuildwheel test step - to verify the wheels can be installed and used

[adamserafini]

fyi: I'm trying to use this recipe in my own project and finding I get this error in my CI for the mac osx abi3 build, but only when I try and test/install it:

https://github.com/adamserafini/zaml/actions/runs/4242743620/jobs/7374627494

ERROR: zaml-0.0.8-cp36-abi3-macosx_11_0_x86_64.whl is not a supported wheel on this platform.

I'm not asking to fix that bug or get support here, but I do think it would be good to add a 'test' step to the cibuildwheel config as a sort of 'proof' that this approach definitely works.

Happy to add one btw. if this proposal is likely to be accepted.

[joerick]

I beleive this isn't an issue with the abi3 bit, but actually the macosx_11_0.

This is an issue with pip/macOS, where older pythons think they're on 10.16, rather than the actual version. See this issue for more info - pypa/cibuildwheel#1410

You might be able to get the build to work by setting SYSTEM_VERSION_COMPAT=0 during the build/test. However, Python 3.6 users are unlikely to be able to use the wheels either, without that flag. Perhaps you could reduce the macos minimum version?

[adamserafini]

🙇 OK, thanks a lot for the hint. I will investigate that.

I do agree it cannot be about abi3, because I added this to a pyproject.toml in a local checkout of this project and it passes fine!

[tool.cibuildwheel]
test-command = "python -c 'import spam; spam.system(\"exit 0\")'"