How to specify a specific package version to CIBW_TEST_REQUIRES for Windows

[bhazelton]

We've been using cibuildwheel very successfully for some time, it's wonderful! But a new problem just came up on windows builds because we need to limit pytest to <8.0 for now. The following is working on linux & mac builds but failing on windows:

CIBW_TEST_REQUIRES: packaging pytest<8.0 pytest-cov pytest-cases

On Windows it generates an error: The system cannot find the file specified.

The relevant section of the build log is:

  + pip install packaging 'pytest<8.0' pytest-cov pytest-cases
  The system cannot find the file specified.
Error: Command ['pip', 'install', 'packaging', 'pytest<8.0', 'pytest-cov', 'pytest-cases'] failed with code 1. None

How should the version specification be done to work on Windows (as well as linux and mac)? I've tried adding quotes and quotes with a space between the package and version specification, neither worked.

Thanks for the package and the help!!

CI link: https://github.com/RadioAstronomySoftwareGroup/pyuvdata/actions/runs/7732465269/job/21082460054

workflow link: https://github.com/RadioAstronomySoftwareGroup/pyuvdata/blob/always-slicify/.github/workflows/publish-to-test-pypi.yaml